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MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 101
Modem AT Commands & S-Registers
verification read command in the same command string as the
configuration assignment command. In the three preceding
examples, type ATS8=5S8?, ATS0=4S3?, and ATS7=75S7?,
respectively.
AT Commands that Affect S-Registers
For maximum throughput, the ISIHPs default configuration is for
originating a call to another 33,600 bps modem that supports error
correction, data compression, and flow control. If the receiving modem is
not compatible, the ISIHP can match any ITU-T or Bell standard modem
(but not proprietary protocols).
If you require a different configuration for your applicationfor example,
if you want to use an ISIHP modem strictly as an auto answering device or
for service that does not support error correctionyou can change the
command parameters and S-register values in active memory and save the
new values with the &W command.
The &W0 (or &W) command stores all current AT command and S-register
values into nonvolatile random access memory (NVRAM) and configures
the modem so that it reads your custom settings in NVRAM when the
modem is turned on or when it is reset with the Z command. (The &F reset
command will continue to read the factory default settings in read-only
memory [ROM].) For convenience, you can include the &W command in
the same command string that sets the new values in active memory as in
the following example: AT\N2&C1S0=10&W0<cr>
Modem Result Codes
Terse Verbose Definition
0 OK Command executed without error;
ready for next command.
1 CONNECT Modem has detected carrier and gone
online.
2 RING Modem has detected ring caused by
incoming call.
3 NO CARRIER No carrier signal has been detected
within the allowed time.