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Appendix A : AT Command Quick Reference
Modem AT Commands
Basic AT Command Set
Command
Options
A/
<any key>
All the following commands require an "AT" prefix
A
Bn
B0
B1 *
B2
B3
B15
B16
Dn
L
P
R
S=n
T
W
,
!
@
;
En
E0
E1 *
Hn
H0 *
H1
Mn
M0
M1 *
M2
M3
Nn
N0
N1 *
On
O0
O1
O3
P
Qn
Q0 *
Q1
T
Vn
V0
V1 *
Wn
Function & Description
Re-execute the last command string
Terminate the current connection attempt when entered in handshaking state
Go off-hook and attempt to establish a connection without waiting for a ring
Line modulation options
Select V.22 mode for 1200 bps connection
Select Bell 212A for 1200 bps connection
Select V.23 1200 bps for receiving, 75 bps for transmitting in originate mode; 75 bps
for receiving and 1200 bps for transmitting in answer mode
Select V.23 75 bps for receiving, 1200 bps for transmitting in originate mode; 1200
bps for receiving and 75 bps f or transmitting in answer mode
Select V.21 for 300 bps connection
Select Bell 103 for 300 bps connection
Dial command, beginning the dialing sequence. The string "n" (telephone number and
modifiers) listed as follows is entered after the "D" command
Re-dial last number. Should be the first character following ATD, ignored otherwise
Pulse dial.
Reverse dial. Originate call in answer mode (go on-line in answer mode)
Dial the phone number stored in NVRAM at location "n" (n=0, 1, 2, 3)
DTMF tone dial.
Wait for second dial tone. The modem waits for the second dial tone before
processing the dial string
Pause. Cause the modem to pause for a time before processing the next character in
the dial string (specified by S8 register)
Hook Flash (for call transfer). Cause the modem to go on-hook for 0.5 second then
return to off-hook
Wait for 5 seconds of silence after dialing number
Return to command state after dialing a number without disconnecting the call
AT command echo options
Echo disabled
Echo enabled
Switch-hook control
Modem goes on-hook
Modem goes off-hook
Speaker control
Speaker always off
Speaker on until carrier present
Speaker always on
Speaker off during dialing and on until carrier present
Select negotiate handshake
When originating or answering, handshake only at the communication rate specified
by S37 register and "ATBn" and no fallback
When originating or answering, start handshaking only at the communication standard
specified by S37 register and "ATBn" During handshake, fallback to a lower speed may
occur.
Go on-line
Return modem to a previously established state (return to data mode).
Begin a retrain sequence, then return to on-line state.
Issue a rate re-negotiation, then return to on-line state.
Enable pulse dialing (Disabled in CTR 21 approved models)
Result code display options
Result code enabled
Result code disabled
Enable tone dialing
Result code form
Display result code in numeric form (see
also the result code options table)
Display result code in verbose (text) form
Select extended result code options
59
BAUSCH DATACOM
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