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INCOMPATIBILITIES THAT ARISE DUE TO THE ABSENCE OF THE NON VOLATILE RAM
If you own A Zoltrix Low Speed Fax Modem (i.e. Fax Modems with a 2400bps Modem), your Model more than likely, does not have a Non Volatile Ram Chip installed on the Modem. The Standard 96/24 Send & Receive Fax/Modem, has an empty socket on the P.C.B. for installing the optional chip.
A lot of software will attempt to store the contents of its Init. String into Stored Profile 0 of the N.V. Ram. If the optional N.V. Ram chip is not installed, the contents of the Init. String will not be stored.
After attempting to store the Init. String, most software will issue the command to reset the Modem, (ATZ). Since there is no N.V. Ram chip, this command will now reset the modems Active Profile(current settings) back to the Factory default values, instead of resetting the modems Active Profile (current settings) with the contents of Stored Profile 0, like the software expected. Therefore the software's Init. String had no effect on the Modems Active Profile.
COMMANDS THAT SHOULD NOT BE USED WITH MODEMS WITHOUT A N.V. RAM
The following commands should not be used by application software with any Modem that does not have a Non Volatile Ram installed:
ATZ Reset
This command will be equivalent to the AT&F command (Restore Active Profile to Factory Default Values) when used on Modems without N.V. Ram. This will configure the Modem in a way not expected by the software.
AT&D3 DTR Option (Use AT&D2 instead)
This command adds one function to the AT&D2 command. It will perform a ATZ command. (See ATZ command)
AT&Wn Store User Profile
This command stores the Active Profile into the Modems N.V. Ram. This is the most obvious command that cannot be used. If there isn't a N.V. Ram present, you cannot store anything in it.
AT&Zn=x Store Phone Number
This command stores a number into the Modems N.V. Ram. If there isn't a N.V. Ram present, you cannot store anything in it.
ATDS=n Dial Stored Number (Dial Parameter)
This command will dial a number that has been stored in the N.V. Ram. Without the N.V. Ram there will be nothing to dial.
SOLUTIONS TO INCOMPATIBILITY PROBLEMS
1) The best solution to this problem is to purchase and install the N.V. Ram chip (if your Model supports it.). This method should totally eliminate any compatibility problems.
2) When installing the software, if you have a choice of modems, select Hayes Compatible and not Hayes Smartmodem V Series 2400. The main difference between these two types of modems is the presence or absence of the N.V. Ram chip. When you select Hayes Compatible, the software will automatically change it's Init strings to similar settings that are explained in solution #3.
3) You may also correct the problem by changing the software's Init. strings. The main commands to look for, and eliminate, are the Z & &D3 commands.
a) If the Init sting is ATZ^M, try adding the following commands to the Init string:
AT&C1&D2 S7=60 S11=55 S0=0^M
b) Otherwise, try adding the contents of the software's Init. String into the Dialing Prefix field.
Ex: AT&C1&D2 S7=60 S11=55 S0=0^M Current Init. String
ATDT Current Dialing Prefix
AT&C1&D2 S7=60 S11=55 S0=0^MDT New Dialing Prefix
Note: Even if there are changeable Init. Strings, some software may use the ATZ command during certain times. If this is the case, the only solution is to purchase and install the N.V. Ram chip.
Following is an example of the commands ProComm Plus will send to the modem when you select Hayes Compatible, and Hayes Smartmodem V Series 2400:
Hayes Smartmodem V Series 2400
transmit "AT&F^M~~" These commands are sent to the modem
transmit "AT&C1~&D2~S7=60~S11=55^M~~" when installing the software, and are
transmit "AT&W^M" not user changeable in the software.
initstring="ATZ^M" This is the Init. String.
Note: Notice the ATZ (^M is the Enter Key) in the Init. string.
Modem Hayes Compatible 2400 Baud Modem
initstring="ATE1Q0V1X4&C1&D2 S7=60 S11=55 S0=0^M" This is the Init. String
Note: Notice that commands are not sent to the modem during software installation and then stored in the N.V. Ram. Instead the Init. string contains the commands necessary for the software to operate correctly, instead of just sending the ATZ command.
HOW TO ORDER THE N.V. RAM CHIP
Not all models support the addition of a N,V. RAM Chip. To purchase the N.V. RAM Chip, contact the Computer Dealer that you purchased your Modem from. If you cannot contact them,(they went out of business) call the Zoltrix sales Dept. at (510) 657-1188.
Before ordering the Chip you must first determine what Model you have.
HOW TO DETERMINE YOUR MODEL