Multi-Tech Systems ISIHP-4SD, ISIHP-4U Modem Result Codes, AT Commands that Affect S-Registers

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 ISIHP’s 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 application—for example, if you want to use an ISIHP modem strictly as an auto answering device or for service that does not support error correction—you 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.

MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 101