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AT Command set summary for PCTel chipset
Zoltrix AT Command Manual For Zoltrix 56K HSP Models
Rev 1.0 10/9/1998

MODELS:
FMHSP56p         Internal K56Flex/V.90 Dual Mode Speaker Phone Fax/Modem (14,400 Fax/56,000 Modem)
FMHSP56PCI     Internal K56Flex/V.90 Dual Mode Speaker Phone Fax/Modem (14,400 Fax/56,000 Modem)

The commands listed in this document are for Zoltrix Modems based on PCtel's 56K chipsets.

AT Command Format

With the single exception of the A/ command, all commands to the modem begin with the characters AT, and end with a carriage return character, hence the name AT commands. The general format of an AT command is: AT<command string> where <command string> represents zero or more commands described in this manual. The <command string> can be null, resulting in the simple sequence "AT". This sequence, often called the attention command, is useful for checking that communication is established between an application program and the modem. The response to the AT command is always OK, providing positive indication of proper operation. It may be useful to issue the AT command several times, with a brief pause (100 ms. or so) between commands, until the OK response is received. Since the AT command string has no other effect except to elicit the OK response, it can be used whenever the modem is in command mode. The AT portion of an AT command can be in upper case or lower case, but not mixed case, thus AT or at, but not At or aT". The <command string> portion is independent of case. The <command string> may contain space characters, which are ignored.

Your Zoltrix MODEM has been pre-set at the factory for optimum performance.
All defaults are set to allow the modem to negotiate the best possible connection with highest quality, data compression, and error correction.

DEFAULT INIT STRING

The Default INIT string used at the factory and stored into the modem is as follows:

            AT&F&C1&D2

Because the modem was initialized at the factory, you could use an initialization (INIT) string of:

            ATZ

Note:   This command resets the modem to the stored settings. If the settings have been changed by software or manually, this INIT string may not work correctly.

You could change the INIT string in all of your software packages to either of the two previous examples. The first example is the best to use because some software may change the values stored in the modem.

If you want to custom configure your stored profiles, we suggest that you always start out with an AT&F&C1&D2 before customizing other commands. This string will reset the modem to the factory defaults as well as reset some other basic settings.

If modem performance suffers after modifying settings, send the INIT string above (AT&F&C1&D2) to the modem.

PERFORMANCE ISSUES

To get optimum performance from your Zoltrix MODEM, the phone line quality over which you are transmitting and receiving must be reliable and relatively free of "noise". If you have very noisy lines you may be able to get a good connection by forcing the modem to connect at a lower speed. Refer to the S34 and S37 registers and Limiting the Modems Top Speed for information on controlling the modems speed.

LIMITING THE MODEMS TOP SPEED

If you experience problems connecting to slower modems (2400 or 1200bps), you may need to instruct your modem to limit the top speed to attempt. You may also need to limit the top speed the modem attempts to something less than 33,600bps, even when calling another 33,600 modem, because of the line noise in your area. If you don't, you may experience "garbage" or a "NO CARRIER" message.
This should not be necessary in most cases, but, there are some 2400bps and 1200bps or even 9600bps modems you may not connect to without using one of the following methods:
 
 

1. For connections or 14,400 and below, use the combination of the N0 command along with setting S37 to the proper value to limit the modems connection speed attempted.
2. Use the combination of the N0 command along with setting S37 and S34 to the proper value to limit the modems connection speed attempted.
3. Use the N0 command and set your software to the connection rate desired.

Note: Method #3 is not the desired method to use if you are making an error-correction connection with compression! The softwares "BAUD" rate should be at least twice, and preferably four, times the Carrier rate established. Otherwise you will get no benefits from the compression. Transfers will actually be slower than if a non-compression connection was established. You also cannot set software to all the connection rates that are supported by the 56K modem. 

Command

Function

A/ 

Execute previous command - does not require a <CR> * 

A

Causes the modem to go off hook. If a call is coming in, the modem will try to answer it. The procedure for answering a call is a short silence and then an answer tone. Sending a character to the modem during this procedure will abort the answer procedure. The amount of time the modem will wait for a carrier is programmable by modifying the S7 register. 

B0

B1

B2

B0 Select CCITT V.22 (1200 bps)

Select Bell 212A (1200 bps)

Select CCITT V23 Originate mode will transmit data at 75 bps and receive data at 1200 bps. Answer mode will transmit data at 1200bps and receive data at 75bps. The command N0 (Disable auto mode) must be selected. 

D

Dmn

D alone will take the modem off-hook and wait for a dial tone. (See X command for exceptions) The length of time to wait for a dialtone before dialing is programmable in register S6.

ATDmn will dial a phone number where m is a modifier: L, W, ,, ;, @, !, or S. It will dial the telephone number n.

L

Dial last number 

W

Wait for dial tone. If you have selected X0 or X1 (disable dial tone detection), then you can use this modifier to override that setting.

,

Pause during dial. The amount of time to pause is determined in register S8.

;

Return to command mode after dialing. It doesn't wait for carrier or hang up. 

@

Wait for 5 seconds of silence. This is used to access systems that do not provide a dial tone.

!

Hook flash. Causes the modem to go on-hook for 0.5 seconds. This is used in PBX systems and for voice features like call waiting

S=(0-9)

Dials a stored number. Up to ten numbers can be stored, and the addresses are from 0 to 9. To store a number into one of these addresses, use the &Z command.

^

Turns on 1300Hz calling tone.

E0

E1

Commands issued to the modem are not echoed to the local terminal. This only matters in the command mode. It does not affect the modems ability to send response codes.

Commands are echoed to the local terminal.

H0

H1

Force modem on-hook (hang-up).

Force modem off-hook (to answer or dial).

I0

I1

I2

I3

I4

Return numeric product code

Return hardware variation code

Report internal code

Report software revision number

Report product feature listing

L0

L1

L2

L3

Speaker volume zero

Speaker volume low

Speaker volume low

Speaker volume low (Hardware currently limits volume adjustment to on/off) 

M0

M1

M2

M3

Speaker always off

Speaker on until carrier detected

Speaker always on

Speaker on during answering only

N0

N1

Disable auto-mode. This forces the modem to connect at the speed specified in register S37.

Enable auto-mode. The modem will answer at the highest available line speed and ignore any ATBn command.

O0

O1

Return to data mode. If you have entered the command mode using the time independent escape sequence, this will put you back in data mode without going on-hook.

Retrain the modem. If the line condition has changed since the original connection, retraining the modem will cause it to reconnect at the most efficient speed for the current line condition.

P

Pulse dialing allows the modem to work on telephone networks where tone is not supported.

Q0

Q1

Enable response to DTE.

Disable response to DTE. The modem does not respond to the terminal. Issuing a command will not produce a response (unless the command is something like ATZ, which will restore this setting to default.)

Sn 

Set default S-register. Any subsequent = or ? commands will modify the default S register. 

Sn=m

Set register n to value m

Sn?

Return the value of register n

T

Tone dialing

V0

V1

Result codes will be sent in numeric form. (See the result code table 3)

Result codes will be sent in word form. (See the result code table 3). 

W0

W1

W2

Report DTE speed only. After connection, there will be no message about what Error Correction or Data Compression protocol is in use.

Report DCE speed, Error Correction/Data Compression protocol, and DTE speed.

Report DCE speed only

X0

X1

X2

X3

X4

Send OK, CONNECT, RING, NO CARRIER, ERROR and NO ANSWER. Busy and Dial Tone Detection are disabled. 

Send X0 messages and CONNECT speed

Send X1 message and NO DIALTONE

Send X2 messages except NO DIALTONE, BUSY and RING BACK

Send all responses

Y0

Y1

Disable long space disconnect

Enable long space disconnect; with error correction, hang up after sending 1.6 second long space; without error correction, hang up after 4 second long space.

Z0

Z1

Reset modem to profile 0 

Reset modem to profile 1 

=n

Sets the value of the default S register

?

Reports the value stored in the default S register.

Command

Function

&C0

&C1

Force DCD on

DCD follows remote carrier

&D0

&D1

&D2

&D3

DTR is assumed on

DTR drop causes modem back to command mode without disconnecting

DTR drop causes modem to hang up

DTR drop causes modem to be initialized;&Y determines which profile is loaded.

&F

Load factory profile

&G0

&G1

&G2

Disable guard tone

Enable 550Hz guard tone

Enable 1800Hz guard tone on answering modem

&K0

&K3

&K4

&K5

&K6

Disable flow control

Enable RTS/CTS flow control

Enable XON/XOFF flow control

Enable transparent software flow control

Enable both RTS/CTS and XON/XOFF flow control

&P0

&P1

Make/break pulse dial ratio of 39/61

Make/break pulse dial ratio of 33/67

&S0

&S1

Force DSR on

DSR on at the start of handshaking and off after carrier loss

&T0

&T1

Terminate test

Start ALB test

&U0

&U1

Enable trellis coding

Disable trellis coding

&V0

&V1

&V2

Display active profile

Display stored profiles

Display stored telephone numbers 

&W0

&W1

Save active profile to profile 0

Save active profile to profile 1

&Y0

&Y1

Use profile 0 on powerup

Use profile 1 on powerup

&Zn=m

Save telephone number (up to 36 digits) into memory location n (0-9)

Command

Function

%C0

%C1

%C2

%C3

Disable data compression 

Enable MNP5 compression

Enable V.42bis compression

Enable both V.42bis and MNP5

%E0

%E1

%E2

%E3

Disable auto-retrain

Enable auto-retrain

Enable auto-retrain and fallback

Enable auto-retrain and fast hang up

%L

Report received signal level in -dBm

%N0

%N1

%N2

%N3

%N4

%N5

%N6

%N7

%N8

%N9

Dynamic CPU loading disabled

Dynamic CPU loading not to exceed 10%

Dynamic CPU loading not to exceed 20%

Dynamic CPU loading not to exceed 30%

Dynamic CPU loading not to exceed 40%

Dynamic CPU loading not to exceed 50%

Dynamic CPU loading not to exceed 60%

Dynamic CPU loading not to exceed 70%

Dynamic CPU loading not to exceed 80%

Dynamic CPU loading not to exceed 90%

%Q

Report line signal quality

Command

Function

\A0

\A1

\A2

\A3

64-character max. MNP block size

128-character max. MNP block size

192-character max. MNP block size 

256-character max. MNP block size 

\Bn

In non-error correction mode, transmit break in 100 ms units (1-9 with default 3)

\G0

\G1

Disable XON/XOFF flow control (modem to modem)

Enable XON/XOFF flow control (modem to modem)

\Kn

Define break type (refer to table 2)

\L0

\L1

Use stream mode for MNP

Use interactive block mode for MNP

\N0

\N1

\N2

\N3

\N4

\N5

Normal mode; speed control without error correction

Plain mode; no speed control and no error correction

Reliable mode

Auto-reliable mode

LAPM error correction only

MNP error correction only

Command

Function

*Q0

*Q1

Send the "CONNECT xxxx" result codes to the DTE when an invalid TIES escape sequence is detected after the "OK" response has already been sent

Does NOT send the "CONNECT xxxx" result codes to the DTE when an invalid TIES escape sequence is detected after the "OK" response has already been sent

Command

Function

\Kn

\K0

\K1

\K2

\K3

\K4

\K5

Local DTE sends break during normal or reliable mode

Enter command state; no break to remote

Empty data buffers; break to remote

Same as \K0

Immediately send break to remote

Same as \K0

Send break to remote with TXD data

\Kn

\K0

\K1

\K2

\K3

\K4

\K5

Local modem sends break during plain mode

Break to remote; and enter command state

Same as \K0

Send break to remote

Same as \K0

Same as \K2

Same as \K2

\Kn

\K0

\K1

\K2

\K3

\K4

\K5

Remote modem sends break during normal mode

Empty data buffers; and send break to DTE

Same as \K0

Immediately send break to DTE

Same as \K2

Send break to DTE with buffered RXD data

Same as \K4

Long Form

Short Form

Description

OK

0

Modem successfully executed a AT command

CONNECT

1

A connection established

RING

2

Modem detected an incoming call

NO CARRIER

3

Modem lost or could not detect a remote carrier signal within the register S7 time 

ERROR

4

Modem detected an error in an AT command

CONNECT 1200

5

Connection at 1200 bps

NO DIALTONE

6

Modem did not detect a dial tone within 5 seconds after off-hook

BUSY

7

Modem detected a busy tone

NO ANSWER

8

Modem did not detect 5 seconds of silence when using the @ dial modifier in the dial command

CONNECT 0600

9

Connection at 600 bps

CONNECT 2400

10

Connection at 2400 bps

CONNECT 4800

11

Connection at 4800 bps

CONNECT 9600

12

Connection at 9600 bps

CONNECT 7200

13

Connection at 7200 bps

CONNECT 12000

14

Connection at 12000 bps

CONNECT 14400

15

Connection at 14400 bps

CONNECT 19200

16

Connection at 19200 bps

CONNECT 38400

17

Connection at 38400 bps

CONNECT 57600

18

Connection at 57600 bps

CONNECT 115200 

19

Connection at 115200 bps

CONNECT 28800

20

Connection at 28800 bps

CONNECT 300

21

Connection at 300 bps

CONNECT 1200TX/75RX

22

Connection at transmit 1200/receive 75 bps

CONNECT 75TX/1200RX

23

Connection at transmit 75/receive 1200 bps

CONNECT 110

24

Connection at 110 bps

RING BACK

25

Ring Back signal detected

+FCERROR

+F4

Error occured in Class 1 fax operation

FAX

33

Fax modem connection established

DATA

35

Data modem connection established

CARRIER 300

40

Carrier rate of 300 bps

CARRIER 1200/75

44

Carrier rate of transmit 1200/receive 75 bps

CARRIER 75/1200

45

Carrier rate of transmit 75/receive 1200 bps

CARRIER 1200

46

Carrier rate of 1200 bps

CARRIER 2400

47

Carrier rate of 2400 bps

CARRIER 4800

48

Carrier rate of 4800 bps

CARRIER 7200

49

Carrier rate of 7200 bps

CARRIER 9600

50

Carrier rate of 9600 bps

CARRIER 12000

51

Carrier rate of 12000 bps

CARRIER 14400

52

Carrier rate of 14400 bps

CARRIER 16800

53

Carrier rate of 16800 bps

CARRIER 19200

54

Carrier rate of 19200 bps

CARRIER 21600

55

Carrier rate of 21600 bps

CARRIER 24000

56

Carrier rate of 24000 bps

CARRIER 26400

57

Carrier rate of 26400 bps

CARRIER 28800

58

Carrier rate of 28800 bps

CONNECT 16800

59

Connection at 16800 bps

CONNECT 21600

61

Connection at 21600 bps

CONNECT 24000

62

Connection at 24000 bps

CONNECT 26400

63

Connection at 26400 bps

COMPRESSION: CLASS 5

66

MNP Class 5 data compression connection established 

COMPRESSION: V.42bis

67

V.42bis data compression connection established

COMPRESSION: NONE

69

Connection established without data compression

PROTOCOL: NONE

76

Connection established without error correction

PROTOCOL: LAPM

77

V.42/LAPM error correction connection established

PROTOCOL: ALT

Register

Function

0

Rings to auto-answer

Set the number of rings required before the modem answers. 0 setting disables auto-answer.

Range: 0 - 255 rings

Default: 0 (auto-answer disabled)

1

Ring counter

Count the number of rings before the modem answers.

Range: 0 - 255 rings

Default: 0 

2

Escape character

Define the character used for the three-character escape code sequence. 0 setting disables the escape code character.

Range: 0 - 127

Default: 43 (+)

3

Carriage return character

Define the character for carriage return

Range: 0 - 127

Default: 13 (carriage return)

4

Line feed character

Define the character for line feed 

Range: 0 - 127 

Default: 10 (line feed) 

5

Backspace character

Define the character for backspace

Range: 0 - 127

Default: 8 (backspace)

6

Wait before dialing

Set the length of time to pause after off hook before dial.

Range: 2 - 255 seconds

Default: 2 seconds

7

Wait for carrier after dial

Set the length of time that the modem waits for a carrier from the remote modem before hanging up.

Range: 1 - 255 seconds

Default: 50 seconds

8

Pause time for dial delay

Set the length of time to pause for the pause dial modifier ",".

Range: 0 - 255 seconds

Default: 2 seconds

9

Carrier detect response time

Define the length of time a signal is detected and qualified as a carrier.

Range: 1 - 255 tenths of a second

Default: 6 (0.6 second)

10

Lost carrier hang up delay

Set the length of time the modem waits before hanging up for a carrier loss.

Range: 1 - 255 tenths of a second

Default: 14 (6 seconds)

11

DTMF speed control

Set the length of tone and the time between tones for the tone dialing.

Range: 50 - 255 milliseconds

Default: 95 milliseconds

12

Escape Prompt Delay (EPD) timer

Set the time from detection of the last character of the three character escape sequence until the "OK" is returned to the DTE

Range: 0 - 255 fiftieths of a second

Default: 50 (1 second)

13

Reserved

14

Reserved

15

Reserved

16

Reserved

17

Reserved

18

Test timer

Set the length of loopback test.

Range: 0 - 255 seconds

Default: 0 (disable timer)

19

Reserved

20

Reserved

21

Reserved

22

Reserved

23

Reserved

24

Reserved

25

Delay to DTR

Set the length of time the modem ignores DTR before hanging up

Range: 0 - 255 hundredths of a second

Default: 5 (0.05 second)

26

Reserved

27

Reserved

28

Reserved

30

Disconnect inactivity timer

set the length of time allowed for inactivity before the connection is hung up.

Range: 0-255 in 10 seconds

Default: 0 (disabled)

32

XON character

Set the value of XON character

Range: 0-255

Default: 17

33

XOFF character

Set the value of XOFF character

Range: 0-255

Default: 19

34

Data rate (bit-rate)

Set the maximum bit rate for V.34, K56Flex or V.90

V.34 (ATN0S37=12)

Range : 0-13

Bit rate = ((S34)+1) * 2400 bps

Example:

If N0S37=12

S34

0 =2,400 bps

1 =4,800 bps

2 =7,200 bps

3 =9,600 bps

4 =12,000 bps

5 =14,400 bps

6 =16,800 bps

7 =19,200 bps

8 =21,600 bps

9 =24,000 bps

10=26,400 bps

11=28,800 bps

12=31,200 bps

13=33,600 bps

K56Flex (ATN0S37=13)

Range : 0-12

Bit rate = 32,000 + (S34 * 2000 bps)

Example:

If N0S37=13

S34

0 =32,000 bps

1 =34,000 bps

2 =36,000 bps

3 =38,000 bps

4 =40,000 bps

5 =42,000 bps

6 =44,000 bps

7 =46,000 bps

8 =48,000 bps

9 =50,000 bps

10=52,000 bps

11=54,000 bps

12=56,000 bps

V.90 (ATN0S37=14)

Range : 0-21

Bit rate = 28,000 + (S34 * 1333.333 bps)

Example:

If N0S37=14

S34

0 =28,000 bps

1 =29,333 bps

2 =30,666 bps

3 =32,000 bps

4 =33,333 bps

5 =34,666 bps

6 =36,000 bps

7 =37,333 bps

8 =38,666 bps

9 =40,000 bps

10=41,333 bps

11=42,666 bps

12=44,000 bps

13=45,333 bps

14=46,666 bps

15=48,000 bps

16=49,333 bps

17=50,666 bps

18=52,000 bps

19=53,333 bps

20=54,666 bps

21=56,000 bps

V.34 symbol rate (baud-rate)

Set the maximum baud rate for V.34

Range: 0-5

0 - 2400 baud

1 - 2743 baud (N/A)

2 - 2800 baud (N/A)

3 - 3000 baud 

4 - 3200 baud 

5 - 3429 baud (N/A until V.34bis) 

Default: 0 (2400 baud)

36

Reserved

37

Line connection speed

0 - Attempt to connect at the highest speed

3 - Attempt to connect at 300 bps

4 - Attempt to connect at 1200 bps

6 - Attempt to connect at 2400 bps

7 - Attempt to connect at 4800 bps

8 - Attempt to connect at 7200 bps

9 - Attempt to connect at 9600 bps

10 - Attempt to connect at 12000 bps

11 - Attempt to connect at 14400 bps

12 - Attempt to connect at V.34

13 - Attempt to connect at K56Flex

14 - Attempt to connect at V.90

Default: 0

Delay before forced hang up

Set the delay to hang up after the disconnecting command is received.

Range: 0 - 255 seconds

Default: 20 seconds

39

Reserved

40

Reserved

41

Reserved

42

Reserved

43

Reserved

44

Reserved

45

Reserved

46

Reserved

47

Reserved

48

Reserved

82

Reserved

86

Call failure reason code

0 - Normal disconnect; no error 

4 - Loss of carrier 

5 - V.42 negotiation failed to detect an error correction modem at remote end 

6 - No response to complete negotiation 

9 - No common protocol 

12 - Remote initiated a normal disconnect 

13 - Remote modem did not respond after 10 message retransmissions 

14 - Protocol violation 

15 - Compression Failure 

20 - Hang up by inactivity time out 

91

Transmit level

Set the transmit level in -dBm

Range: 0 - 15 (-dBm)

Default: 11 (-11 dBm)

Command

Function

+FCLASS=0

+FCLASS=1

+FCLASS=?

Select data mode

Select facsimile Class 1 mode

Report service classes supported

+FAE?

+FAE=?

+FAE=1

Report active adaptive answer setting: 0 for disabled, 1 for enabled

Report adaptive answer capability

Enable adaptive answer

+FTS=n

Stop transmission and pause, 0-255 in 10 ms

+FRS=n 

Wait for silence, 0-255 in 10 ms 

+FTM=?

Report Class 1 transmit capabilities

+FRM=?

Report Class 1 receive capabilities

+FTH=n

Transmit data with carrier n, 

n = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146

+FRH=n

Receive data with carrier n, 

n = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146 

Command

Function

ATA

Answering in Voice Mode

ATD

Dial command in Voice Mode

ATH

Hang up in Voice Mode

ATZ

Reset from Voice Mode

AT#BDR

Select baud rate (turn off autobaud)

AT#CID

Enable Caller ID detection and select reporting format

AT#CLS

Select data, fax, or voice

AT#MDL?

Identify model 

AT#MFR?

Identify manufacturer

AT#TL

Transmit level control

AT#REV?

Identify revision level

AT#RG

Record gain control

AT#SPK

Change the setting of Speakerphone

AT#VBS

Bits per sample (ADPCM)

AT#VBT

Beep tone timer

AT#VLS

Voice line select (ADPCM)

AT#VRA

Ringback goes away timer (originate)

AT#VRX

Voice Receive Mode (ADPCM)

AT#VSD

Silence deletion tuner (voice receive, ADPCM)

AT#VSP

Silence detection period (voice receive, ADPCM)

AT#VSS

Silence sensitivity tuner (voice receive)

AT#VTX

Voice Transmit Mode (ADPCM)

AT#VBQ?

Query buffer size

AT#VCI?

Identify compression method (ADPCM)

AT#VRN

Ringback never came timer (originate)

AT#VSK

Buffer skid setting

AT#VSR

Sampling rate selection (ADPCM)

AT#VTD

DTMF/tone reporting capability

AT#VTS

Play tone string (online voice command)

Code Sent to DTE 

Meaning

<DLE>0 - <DLE>9,

<DLE>*, <DLE>#, 

<DLE>A - <DLE>D

DTMF

Digits 0 through 9, *, #, or A through D detected by the modem. 

<DLE>a

Answer Tone(CCITT)

Send to the DTE when the V.25/T.30 2100 Hz Answer Tone (Data or Fax) is detected. If the DTE fails to react to the code, and the modem continues to detect Answer tone, the code is repeated as often as once every 0.5 second 

<DLE>b

Busy

Send to DTE when the busy cadence is detected. The modem sends the busy <DLE>b code every 4 seconds if busy continues to be detected and the DTE does not react. This allows the DTE the flexibility of ignoring what could be a false busy detection. 

<DLE>c

Calling Tone

Sent when the T.30 1100 Hz Calling Tone (Fax Modem) is detected. The modem assumes the calling tone is valid and sends this code only after 4 seconds of proper cadence has been detected. If the DTE does not react to this code, the code is repeated as often as once every 4 seconds. 

<DLE>d

Dial Tone

Sent in Voice Receive Mode when dial tone is detected after any remaining data in the voice receive buffer. The modem sends this code every 3 seconds if dial tone continues to be detected and the DTE does not react. This allows the DTE the flexibility of ignoring what could be a false dial tone detection. 

<DLE>e

European Data Modem Calling Tone

Sent when the V.25 1300 Hz Calling Tone (Data Modem) is detected. The modem assumes that the calling tone is valid, and sends this code only after 4 seconds of proper cadence has been detected. If the DTE does not react to this code and calling tone continues, the code is sent again as often as once every 4 seconds 

<DLE>f

Bell Answer Tone

Sent when Bell 2225 Hz Answer Tone (Data) is detected. If the DTE fails to react to the code and the modem continues to detect Answer tone, the code is repeated as often as every 0.5 second. 

<DLE>h

Hung Up Handset

Sent immediately when the modem detects that the local handset has hung-up. 

<DLE>q

Quiet

Sent in Voice Receive Mode after any remaining data in the receive voice buffer when the silence detection timer (#VSP) expires and the has been voice data passed to the DTE 

<DLE>s

Silence

Sent in Voice Receive Mode after the silence detection timer (#VSP) expires and if valid voice has not been detected (#VSS).

<DLE>t

Handset Off-Hook

Sent one time when the local handset transition go off-hook.

<DLE><ETX>

End of Stream

This code is sent to denote the end of a voice data stream. 

<DLE><ETX>

Terminate

This code is sent to denote the end of a voice data stream. 

<DLE><CAN>

Cancel

Sent during Voice Transmit Mode to indicate that the DTE has finished transmitting a voice message and wants the modem to discard any remaining data in the voice transmit buffer. The modem immediately purges its buffer, and then responds with VCON message entering Online Voice Command Mode. 

<DLE>p

Pause

Sent during Voice Transmit Mode to force the modem to suspend sending voice data to the selected output device. Any data currently in the voice transmit buffer is saved until either a resume (<DLE>r), or cancel (<DLE><CAN>), is received, in which case the data is lost. If a <DLE><ETX> is received during the paused state, the modem processes it normally, and also automatically resumes transmission of the data left in the buffer (appended with <DLE><ETX>). Any other data received from the DTE while in this paused state is placed in the transmit buffer according to available space, with flow control active.

<DLE>r

Resume

Sent during Voice Transmit Mode to force the modem to resume sending voice data to the selected output device. Any data currently in the voice transmit buffer is now played

AT#VRA

Ringback goes away timer (originate)

AT#VRX

Voice Receive Mode (ADPCM)

AT#VSD

Silence deletion tuner (voice receive, ADPCM)

AT#VSP

Silence detection period (voice receive, ADPCM)

AT#VSS

Silence sensitivity tuner (voice receive)

AT#VTX

Voice Transmit Mode (ADPCM)

AT#VBQ?

Query buffer size

AT#VCI?

Identify compression method (ADPCM)

AT#VRN

Ringback never came timer (originate)

AT#VSK

Buffer skid setting

AT#VSR

Sampling rate selection (ADPCM)

AT#VTD

DTMF/tone reporting capability

AT#VTS

Play tone string (online voice command)

Command

Function

ATA

Answering in Voice

This command works similarly to the way it works in Data and Fax Modes. 

Result Code: VCON 

ATD

Dial Command in Voice

This command will perform the dial action in Voice Mode. 

Result Codes: 

VCON

Issued in Voice Mode when the modem determines that the remote modem or handset has gone off-hook.

NO ANSWER

Issues in Voice Mode when the modem determines that the remote has not picked up the line before the S7 timer expires. 

ATH

Hang Up in Voice

This command works the same as in Data and Fax modes by hanging up the phone line. 

• 1. This command forces the #CLS=0, but does not destroy any of the voice parameter setting such as #VBS, #VSP, etc. 
• 2. The #BDR setting is forced back to 0. 

ATZ

Reset from Voice Mode

This command works the same as in Data and Fax modes. In addition, it will also reset all voice related parameters to default states, forces the #BDR=0 condition, and forces the telephone line to be selected with the handset on-hook. 

#BDR 

Select Baud Rate (Turn Off Autobaud)

This command select a specific DTE/modem baud rate.

Parameters: n = 0 - 48 (Baud Rate = n * 2400 bps)

Default: 0

Result Codes:

OK if n is between 0 and 48

ERROR Otherwise

Command options:

#BDR? Return the current setting

#BDR=? Return a message indicating the speeds that are supported

#BDR=0 Enable autobaud detection on the DTE interface

#BDR=n Select the baud rate

#CID

Enable Caller ID Detection and Select Reporting Format

This command enables or disables Caller ID recognition and reporting in any mode.

Parameters: n = 0, 1, or 2

Default: 0

Result Codes: OK n = 0, 1, or 2

ERROR Otherwise

Command Options:

#CID? Return the current setting (0, 1, or 2)

#CID=? Return the message, "0-2"

#CID=0 Disables Caller ID

#CID=1 Enable formatted Caller ID reporting of SDM (Single Data Message) and MDM (Multiple Data Message) packets. 

#CID=2 Enable unformatted Caller ID reporting. 

#CLS

Select Data, Fax, or Voice

This command select Data, Fax, or Voice Mode

Parameters: n=0, 1, 2, or 8

Default: 0

Result Codes: OK if n = 0, 1, 2, or 8

ERROR Otherwise

Command options:

#CLS? Return the current setting (0, 1, 2, or 8)

#CLS=? Return the message, "0, 1, 2, 8"

#CLS=0 Select Data Mode.

#CLS=1 Select Class 1 Fax Mode.

#CLS=2 Select Class 2 Fax Mode.

#CLS=8 Select Voice Mode.

#MDL

Identify Model

This command identifies the model number of the modem.

Command option:

#MDL? "PCT288DFV"

#MFR?

Identify Manufacturer

This command identifies the modem manufacturer. 

Command option:

#MFR? "PCtel"

#REV?

Request Revision Level

This command request the revision number of PCtel Driver.

#REV? "PCtel 2.00"

#RG

Record Gain Control

This command sets the record gain.

Parameters: n = 0000 - 7FFF

Default: 7FFF

Result Codes:

OK if n = 0000 - 7FFF

ERROR Otherwise

Command options:

#RG? Return the current setting

#RG=? Return the message, "0000-7FFF" 

RG=n Set the record gain to n

#SPK

Change the setting of Speakerphone

This command set the parameters for speakerphone.

Parameters: #SPK=<mute>, <spk>, <mic>

<mute> Microphone state

0 microphone mute

1 microphone on (default)

2 Room Monitor mode (mic on max. AGC, speaker off)

<spk> Speaker Output Level

Range: 0 to 15 (speaker attenuation in 2 dB steps)

Default: 5 (10 dB attenuation) Speaker mute is achieve by a value of 16

<mic> Microphone Gain Parameter

0 0 dB 

1 6 dB gain (default) 

2 9.5 dB gain 

3 12 dB gain

Command options:

It is not necessary to enter all three parameters,

#SPK=,<spk>,<mic>

#SPK=,,<mic>

#TL

Transmit Level Control

This command sets the transmit level.

Parameters: n = 0000 - 7FFF

Default: 3FFF

Result Codes: OK if n = 0000 - 7FFF

ERROR Otherwise

Command options:

#TL? Return the current setting

#TL=? Return the message, "0000-7FFF"

#TL=n Set the record gain to n

#VBQ?

Query Buffer Size

This command query the modems voice transmit and voice receive buffers size.

Parameters: None

Command option:

#VBQ? Return the size of buffers.

#VBS

Bits Per Sample (Compression Factor)

This command selects the degree of ADPCM voice compression to be used.

Parameters: n = 4 (Only 4 bits per sample compression ratio is supported)

Default: 4

Result Codes: OK if n = 4

ERROR Otherwise

Command options: 

#VBS? Return the current setting 

#VBS=? Return "4" 

#VBS=4 Selects 4 bits per samples. 

#VBT

Beep Tone Timer

This command sets the duration for DTMF tone generation

Parameters: n = 0 - 40 ( duration = n /10 seconds)

Default: 10

Result Codes:

OK if n = 0 - 40 

ERROR Otherwise

Command options:

#VBT? Return the current setting

#VBT=? Returns the message, "0-40"

#VBT=0 Disables the tone generation capability.

#VBT=n Sets tone duration

#VCI?

Identify Compression Method

This command identifies the compression method used by the modem.

Parameter: None

Command option: 

#VCI? Returns the message, "PCtel;ADPCM;32" 

#VLS

Voice Device Selection

This command select which devices is routed through the modem.

Parameter: n = 0, 1, 2, 3, 4, or 6

Default: 0

Result Codes:

OK if n = 0, 1, 2, 3, 4, or 6

ERROR Otherwise

Command options:

#VLS? Return current setting

#VLS=? Return the device types supported by the modem.

#VLS=n Select Device Type (see table below)

Device Type Device Description 

0           Phone Line with Telephone handset 

1           Handset 

2           On-Board Speaker 

3           Microphone 

4           Telephone line with on-board speaker ON and handset 

6           Speaker Phone 

#VRA

Ringback Goes Away Timer (Originate)

When originate a voice call, this command can set the "Ringback Goes Away" timer value, an amount of time measures from when the ringback cadence stops once detected. If ringback is not detected within this period, the modem assumes that the remotes has picked up the line and switches to Online Voice Command Mode. Every time a ringback cadence is detected, this timer is reset.

Parameters: n = 0 - 255 (0 - 2.55 seconds)

Default: 70

Result Codes:

OK if n = 0 - 255

ERROR Otherwise

Command options:

#VRA? Return the current setting

#VRA=? Return the message, "0-255"

#VRA=0 Turn off the timer. The dialing modem sends VCON and enters Online Voice Command Mode after one ringback. 

#VRA=n Set the timer (timer = n * 0.01 seconds) 

#VRN

Ringback Never Came Timer (Originate)

When originating a voice call, this command set the "Ringback Never Came" timer value, an amount of time measured from completion of dialing. If ringback is not detected within this period, the modem assumes the remote has picked up the line and switches to Online Voice Command Mode.

Parameters: n = 0 - 255 (0 - 2.55 seconds)

Result Codes:

OK if n = 0 - 255

ERROR Otherwise

Command option:

#VRN? Return the current setting

#VRN=? Return the message, "0-255"

#VRN=0 Turn off the "Ringback Never Came timer". After dialing, the modem sends VCON and enters Online Voice Command Mode immediately.

#VRN=n Set the timer (duration = n * 0.01 second) 

#VRX

Voice Receive

This command set the modem in Voice Receive Mode.

Parameters: None

Result Codes:

CONNECT When voice transfer from modem to DTE can begin 

ERROR if #VLS=0 and not connected to any input device 

#VSD

Silence Deletion Tuner (Voice Receive)

This command can enable/disable Voice Receive Mode silence detection. Silence Deletion is not supported in PCtel HSP Modem.

Parameters: n = 0

Default: 0

Result Codes:

OK if n = 0

ERROR Otherwise

Command options: 

#VSD? Return current setting 

#VSD=? Return the message, "0" 

#VSD=0 Disable Silence Deletion 

#VSK

Buffer Skid Setting

This command queries and sets the number of bytes of spare space, after the XOFF threshold is reached, in the modems buffer during Voice Transmit Mode. This equates to the "skid" spare buffer space, or the amount of data the DTE can continue to send after being told to stop sending data by the modem, before the modem voice transmit buffer overflows.

Parameters: n = 0 - 255

Default: 255

Result Code:

OK if n = 0 - 255

ERROR Otherwise

Command options:

#VSK? Return the current setting

#VSK=? Return the message, "0-255"

#VSK=n Set the skid buffer size to n bytes 

#VSP

Silence Detection Period (Voice Receive)

This command sets the Voice Receive Mode silence detection period value. If the modem does not receive any ADPCM data after the timer expired, it will cause the modem to send <DLE>s or <DLE>q codes.

Parameters: n = 0 - 255 (0 - 25.5 seconds)

Default: 55

Result Code:

OK if n = 0 - 255

ERROR Otherwise

Command options:

#VSP? Return current setting

#VSP=? Return the message, "0-255"

#VSP=0 Disable the silence period detection timer

#VSP=n timer = n * 0.1 second

#VSR

Sampling Rate Selection

This command sets the audio codec sampling rate.

Parameters: n = 8000 (8000 Hz sampling rate)

Default: 8000

Result Codes: OK if n = 8000

ERROR Otherwise

Command options:

#VSR? Return the current setting

#VSR=? Return the message, "8000"

#VSR=8000 Set the sample rate to 8000

#VSS

Silence Sensitivity Tuner (Voice Receive)

This command set the sensitivity in Voice Receive Mode silence detection.

Parameters: n = 0 - 3

Default: 2

Result Codes:

OK if n = 0 -3

ERROR Otherwise

Command options:

#VSS? Return current setting

#VSS=? Return the message, "0-3"

#VSS=0 Disable silence detection by the modem in Voice Receive Mode

#VSS=1 Least sensitive setting #VSS=2 Medium sensitive setting

#VSS=3 Most sensitive setting

#VTD

Tone Reporting Capability

This command sets which types of tones can be detected and reported to the DTE via shielded codes in Voice Transmit, Voice Receive, and Online Voice Command Modes.

Parameters: i, j, k

Default: 3F, 3F, 3F

Result Codes:

OK if setting are supported by the modem.

ERROR Otherwise

Command options:

#VTD? Return current setting

#VTD=? Returns the tone reporting capabilities of the modem. 

#VTD=i,j,k Where i, j, k corresponds to the desired capabilities (see table below), i for Voice Transmit, j for Voice Receive, and k for Online Voice Command Modes.

Bit Description

0   0/1=Disable/Enable DTMF tone capability

1   0/1=Disable/Enable V.25 1300 Hz Calling tone capability

2   0/1=Disable/Enable V.30 1100 Hz Facsimile Calling tone

    capability

3   0/1=Disable/Enable V.25/T.30 2100 Hz Answer tone capability

4   0/1=Disable/Enable Bell 2225 Hz Answer tone capability

5   0/1=Disable/Enable call progress tone and cadence 

    tone capability 

#VTS

Play Tone String (Online Voice Command Mode)

This command can play one or more DTMF or other tones. No key abort is allowed.

Dual or Single Tones:

These are represented by a substring enclosed in square brackets ("[ ]") within the parameter. Each such substring consists of three sub-elements corresponding to 2 frequencies in Hertz (0, or 2000-3000) and a duration (ASCII decimal in units of 100ms).

Varying DTMF Digits:

This is represented by a substring enclosed in curly braces ("{ }") within the parameter. Each such substring consists of two sub-elements corresponding to a DTMF digits (0-9, A-D, *, #), and alternate duration in units of 100ms.

Parameters:

The tone generation consists of elements in a list with each element separated by commas.

Result Codes:

OK Command to play tones on currently selected device is accepted. 

ERROR Command was not issued in Online Voice Command Mode or string is grammatically incorrect. 

#VTX

Voice Transmit

This command set the modem in Voice Transmit Mode. The #VLS command should have been previously issued correctly.

Parameters:

None

Result Codes: 

CONNECT When voice transmission by DTE can begin.

ERROR If #VLS=0 and output device is not connected.

%P - PTT Testing Utilities

This facility testing of signal levels provides a continuous signal when the modem is in IDLE mode. This allows the user to initiate a series of signal that are necessary for PTT approval. These signals are answer tone, carriers, modulation, and other pertinent signals. A selected test will be terminated when any keyboard character is entered. The followings are command's description.

Note: For DTMF, the transmit level is -10dBm for low band and -8dBm for high band, inter digit delay is fixed at 70ms. All other transmit level is adjustable according to the setting of register S91 (from -10 to -15dBm). Speaker control initiates by command ATLn.
 

Command

Function

%P00 - %P09

DTMF tone digits from 0 to 9. 

%P10

DTMF digit A.

%P11

DTMF digit B.

%P12

DTMF digit C.

%P13

DTMF digit D.

%P14

DTMF digit *.

%P15

DTMF digit #.

%P16

V.21 Channel 1 mark 980 Hz.

%P17

V.21 Channel 2 mark 1650 Hz.

%P18

V.23 Reversed channel mark 390 Hz.

%P19

V.23 Forward channel mark 1300 Hz.

%P20

V.22 Originate.

%P21

V.22bis originate.

%P22

V.22 Answer.

%P23

V.22bis Answer.

%P24

V.21 Channel 1 space 1180 Hz.

%P25

V.21 Channel 2 space 1850 Hz.

%P26

V.23 Reversed channel space 450 Hz.

%P27

V.23 Forward channel space 2100 Hz.

%P28

V.32 at 9600 bps.

%P29

V.32bis 14400 bps.

%P30

Silence, off-hook.

%P31

V.25 Answer tone 2100 Hz.

%P32

Guard tone 1800 Hz. 

%P33

V.25 Calling tone 1300 Hz.

%P34

Fax calling tone 1100 Hz. 

%P35

V.21 Channel 2 1650 Hz.

%P36

V.27ter 2400 bps.

%P37

V.27ter 4800 bps.

%P38

V.29 7200 bps.

%P39

V.29 9600 bps.

%P40

V.17 7200 bps long train.

%P41

V.17 7200 bps short train.

%P42

V.17 9600 bps long train.

%P43

V.17 9600 bps short train.

%P44

V.17 12000 bps long train.

%P45

V.17 12000 bps short train.

%P46

V.17 14400 bps long train.

%P47

V.17 14400 bps short train.

%P48

V.34, 2400 bps modulation.

%P49

V.34, 4800 bps modulation.

%P50

V.34, 7200 bps modulation.

%P51

V.34, 9600 bps modulation.

%P52

V.34, 12000 bps modulation.

%P53

V.34, 14400 bps modulation.

%P54

V.34, 16800 bps modulation.

%P55

V.34, 19200 bps modulation.

%P56

V.34, 21600 bps modulation.

%P57

V.34, 24000 bps modulation.

%P58

V.34, 26400 bps modulation.

%P59

V.34, 28800 bps modulation.

%P60

V.32bis 9600 bps modulation.

%P61

V.32bis 12000b ps modulation.

%P62

Bell 212A originate 1200 bps

%P63

Bell 212A answer 1200 bps

%P64

Bell 103 originate mark 1270 Hz

%P65

Bell 103 originate space 1070 Hz

%P66

Bell 103 answer mark 2225 Hz

%P67

where 0<= n <=23 

f(Hz) = n * (150Hz) 

n   f(Hz) 

0   0      modem goes off hook and reports power level of

           incoming signal if present

1   150

2   300

3   450

4   600

5   750

6   900

7  1050

8  1200

9  1350

10 1500

11 1650

12 1800

13 1950

14 2100

15 2250

16 2400

17 2550

18 2700

19 2850

20 3000

21 3150

22 3300

23 3450

%I or %I? Country Code Selection and Identification

This command provides the ability of selection the desired country telephony Central Office. When the selection is correct, a set of the selected country parameters will be loaded for the current operation.