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MODEM.DOC
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1992-02-03
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MODEM.DOC
~~~~~~~~~~~
Modem AT command settings
1. Standard 2400 bps or 1200 bps Hayes Compatibles (NON-MNP):
If your modem supports the extended "&" command set, then try:
ATX4Q0E0V1&C1&D2S2=251S7=40
X4 Enables extended result codes
Q0 Modem returns Result Codes
E0 Modem does not echo commands back to the computer
V1 Modem returns Verbal Result Codes
&C1 Modem asserts Carrier Detect based on connection status
&D2 On DTR high-to-low transition, Modem Hangs Up.
S2=251 Disable Modem Escape Sequence
S7=40 Time Modem waits for a carrier when initiating a new connection
If your modem does not support the & command set, try using:
ATX4Q0E0V1S2=251S7=40
Modems which do not use the & command set usually have DIP switches of some type
to set their mode of operation. Verify that your modem is set to:
a) Assert CD (carrier detect) only when conencted to a remote modem
b) Hang Up on drop of DTR (data terminal ready)
2. US Robotics Courier HST / Courier Dual Standard
Since the HST utilizes so many settings, it is almost impossible to include
them all in one initialization string. Therefore, you may wish to use the
NRAM feature to store the settings which are common to most applications,
and use the VBBS init string for VBBS-specific settings.
NRAM Settings Recommended:
X7 Return full result codes
&H1 Turns on hardware handshaking for output from DTE (CTS line) *
&R2 Turns on hardware handshaking for input to DTE (RTS line) *
&B1 Fixes the DTE to DCE rate **
&N0 Negotiates highest link rate with fallback/fallforward enabled
&M4 Enables ARQ if remote modem has ARQ
&C1 Modem asserts carrier detect based on connection status
&D2 On DTR high-to-low transition, modem hangs up
&A3 Give FULL EXTENDED Result Codes
(choose one of these 3 &K commands based on your preference)
&K1 Enables data compression if remote modem requests compression
&K3 Enables V.42 bis data compression but not MNP5
&K0 Disables all compression
and for your VBBS initialization string, use:
ATX7Q0E0V1S2=251S7=25&H1&R2&B1&M4&N0&K1&A3
- or, at least -
ATX7Q0E0V1S2=251S7=25&H1&R2&B1&A3
3. Compucom -
AT&F2*H1%C0\N0S25=2M0QV1ES11=50&C1&D2H&W
4. TwinCom V.32 -
ATE0H0M0Q0V1X4S0=0S2=1W0S95=145
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*You must also enable the hardware handshaking in VCONFIG Ports Configuration.
**You must also enable FIXED baud rate in VCONFIG Ports Configuration.