33.6 Baud modem to 2400 baud

ampike
ampike used Ask the Experts™
on
Does anyone know if this is possible and if so how can it be achieved.

I have a MultiTech Systems 33.6 modem and i want to adjust it to 2400 baud so that no matter where i plug it in the system will see it as 2400 baud and only use this speed.

Please advise
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The only way of doing this I know of is via  script http://www.bigresource.com/VB-Sending-AT-commands-to-the-modem-using-a-batch-file-jSdGjPagLc.html

SENDMODEM ATDT*73 >COM2
WAIT 2 'a delay that I already have
SENDMODEM ATH>COM2
WAIT 2
SENDMODEM ATDT *72,,XXX-XXXX>COM2
WAIT 2
SENDMODEM ATH>COM2
WAIT 2
SENDMODEM ATDT *72,,XXX-XXXX>COM2
WAIT 2
SENDMODEM ATH>COM2

CT
If it is a Hayes compitable modem setting  S Register  to 2400 will turn it into a 2400 modem.
Then the system will be forced to use that speed.

Connect to the modem with a terminal program like HyperTerminal out Putty and issue the follwing command
AT S37=2400

Author

Commented:
ComputerTechie,

Does the script you provided change the speed of the modem to 2400 or does it transfer a phone number to another?

I need to change the speed because this modem is hooked to a server and will be sending and reciving data. If your script just changes where it is connected to then this wont help me. Please confirm.

skykingjwc,

This is not a Hayes modem this is a "MultiTech Systems" modem. I will give it a shot in any case. And advise of my results.

Thanks
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I had a thought put in a batch file that runs during startup and a shortcut on your desktop link to it

@echo off
MODE COM2:2400,N,8,1>NUL

change the com port number to the modem port and this should work. you could also go to the modem properties and changing the max port speed to 2400

CT



Hayes is a command set that most modems use.  I wasn't refering to a Hayes brand modem.

Author

Commented:
Ahh ok. Well i did find a list of AT commands here:

http://michaelgellis.tripod.com/modem.html

So now I can understand what you said below:
"Connect to the modem with a terminal program like HyperTerminal out Putty and issue the follwing command
AT S37=2400"

Will give it a try and let ya know.

Author

Commented:
skykingjwc,

It was the right command but had to go by the value 6. See table below:

 S37 =
      11      14400
      10      12000
      12       7200
       9       9600
       8       4800
       6       2400

But close enough.

Thank you very much for the help.
Hi,

According to the spec sheet found at Multitech (http://www.multitech.com/en_US/DOCUMENTS/Collateral/manuals/S000300B.pdf), please enter the following commands (ensure that your terminal is already set to 2400 baud). Anything in caps, you type followed by Enter:

ATZ
Modem reply: OK (or nothing)

AT
Modem reply: OK (or 0)

AT E1 X4 V1 S11=55 $MB2400 $SB2400 &F9 &W0
Modem reply: OK

Here is an explanation of the options I chose:

E1: echo typed commands
X4: intelligent dial (look for dialtone and busy)
V1: verbose response codes
S11=55: set length of DTMF digit to 55 msec
$MB2400: hardiwire modem bitrate to 2400
$SB2400: hard-wire serial bitrate to 2400
&F9: on power-up, load factory defaults from NVRAM (what we set here)
&W0: save settings to NVRAM

Please let me know if you have any other questions!

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