Appendix F – Modem AT Commands
Multi-Tech Systems, Inc. MultiAccess User Guide
55
Command: I
n
Information
Request
Values:
n
= 0–5, 9, 11
Default: None
Description:
I0
Display default speed and controller firmware version.
I1
Calculate and display ROM checksum (e.g.,
12AB
).
I2
Check ROM and verify the checksum, displaying
OK
or
ERROR
.
I3
Display default speed and controller firmware version.
I4
Display firmware version for data pump (e.g., 94).
I5
Display the board ID: software version, hardware version, and country/region ID
I9
Display the country/regional code (e.g.,
NA Ver. 1
).
I11 Display diagnostic information for the last modem connection, such as DSP and
firmware version, link type, line speed, serial speed, type of error correction/data
compression, number of past retrains, etc.
Command: M
n
Monitor Speaker Mode
Values:
n
= 0, 1, 2, or 3
Default: 1
Description:
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.
Command: N
n
Modulation
Handshake
Values:
n
= 0 or 1
Default: 1
Description:
N0
Modem performs handshake only at communication standard specified by S37 and the
B
command.
N1
Modem begins handshake at communication standard specified by S37 and the B
command. During handshake, fallback to a lower speed can occur.
Command: O
n
Return Online to Data Mode
Values:
0, 1, 3
Default: None
Description:
O0
Exit online command mode and return to data mode (see
+++AT<CR>
escape
sequence).
O1
Issue a retrain and return to online data mode.
O3
Issue a rate renegotiations and return to data mode.
Command: P
Pulse
Dialing
Values: P,
T
Default: T
Description:
Configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed until a
T
command or dial modifier is received.
Command: Q
n
Result Codes Enable/Disable
Values:
n
= 0 or 1
Default: 0
Description:
Q0 Enable result codes.
Q1 Disable result codes.
Q2
Returns
an
OK
for backward compatibility with some software.
