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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 90
Command:
In Identification (for V.22bis)
This command causes the modem to reports the requested result according to the
command parameter.
Values: n = 0–7
Default: None
I0 Reports product code, e.g., “2400”.
I1 Reports the least significant byte of the stored checksum in decimal. Reports
255 if the prestored checksum value is FFh.
I2 Check ROM and verify the checksum, displaying OK or ERROR.
I3 Reports ROM Code Revision-Modulation (e.g., 2109-V90). Revision,
Modulation, and Model.
I4 Reports OEM defined identifier string.
I5 Reports Country Code parameter (see +GCI).
I6 Reports modem data pump and internal code revision.
I7 Reports OK.
Command:
Ln Monitor Speaker Volume
Values: n = 0, 1, 2, or 3
Default: 2
Description: This command sets the speaker volume control. The parameter value, if valid, is written to
S22 bits 0 and 1.
L0 Select low volume.
L1 Select low volume.
L2 Select medium volume.
L3 Select high volume.
Command:
Mn Monitor Speaker Mode
Values: n = 0, 1, 2, or 3
Default: 1
Description: This command selects when the speaker will be on or off. The parameter value, if valid, is
written to S22 bits 2 and 3.
M0 Speaker always off.
M1 Speaker on until carrier signal detected.
M2 Speaker always on when modem is off-hook.
M3 Speaker on until carrier is detected, except while dialing, but on during answering.
Command:
On Return to Online Data Mode
Values: 0, 4, 5
Default: None
Description:
This command determines how the modem will enter the on-line data mode. If in the on-line
command mode, the modem enters the on-line data mode with or without a retrain. If in the
off-line command mode (no connection), the modem reports ERROR.
O0 Enters on-line data mode without a retrain. Handling is determined by the Call
Establishment task. Generally, if a connection exists, this command connects the DTE
back to the remote modem after an escape (+++).
O1 Enters on-line data mode with a retrain before returning to on-line data mode.
Fast retrain without speed change (used for diagnostic purpose only).
Renegotiate rate without speed change (used for diagnostic purpose only. (Not in
V.22bis)
O2 Fast retrain without speed change (used for diagnostic purpose only).
O3 Renegotiate rate without speed change (used for diagnostic purpose only.
O4 Renegotiate rate down one speed (used for diagnostic purpose only). (Not in V.22bis)
O5 Renegotiate rate up one speed (used for diagnostic purpose only). (Not in V.22bis)