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B-6
IBM Personal Computer User Guide
AT commands
Table 1: AT commands
Command
Function
A
Answers incoming call
A/
Repeats the last command given. Note: Do not precede by AT or follow by
Enter
D
0-9, A-D, # and *
L = last number redial
P = pulse dial
T = tone dial
W = wait for second dial tone
V = switch to speakerphone mode
, = pause
@ = wait for five seconds of silence
! = flash
;= return to command mode after dialing
E0
Commands echo disabled
E1
Commands echo enabled
+++
Escape characters - switch from data mode to command mode
H0
Modem on-hook (hang-up)
H1
Modem off-hook (make busy)
I0
Firmware and device ID
I1
Checksum code