V.22 bis Modem with AT Commands
CMX866
1.5.4 AT Command and Register Set
1.5.4.1 AT Command and S-Register Summary
AT Command
Parameters
Function
Answer Command - Answer and establish a connection when off-hook
Re-execute last command
Default
A
A/
Bn
n = 0..9
Select Communications Standard
n=0
Dn ... n
or DTn ... n
n = 0..9, A..D, *,# Dial Command - DTMF dials the subsequent Directory Number
,
!
;
Dial Command Modifier - Delay during dialling - time in S8 register
Dial Command Modifier- Send a line break - time in S29 register
Dial Command Modifier - command mode after dialling, no handshake
Dial Command - Redial last number
DL
En
Hn
In
n = 0,1
n = 0,1
n = 0
Command echo, 0=off, 1=on
n=1
n=0
Switch Hook Control, 0=on-hook, 1=off-hook
Identification - Returns the modem's product identification
V.22bis Fallback to V.22 option, 0=none, 1=automatic
Go online in Data mode (from Command mode)
Enable(n=0)/Disable(n=1) return of modem result codes
Nn
O
n = 0,1
n=1
n=0
Qn
n = 0,1
Execute V.23 or Bell 202 turnaround if enabled (see S14 and S24)
then go online in Data mode
RO
Sn?
Sn=x
Vn
n = 0..29
n = 0..29
n =0,1
S-Register "n" Read - Display specified S Register contents
S-Register "n" Write - Write to specified S Register
Return result codes as numbers (n=0) or words (n=1)
Calling and Response Characteristics
n=0
n=3
Xn
n = 0..3
Z
Restore factory profile for CMX866
&Cn
&Dn
&Gn
&Tn
n = 0,1
n= 0..2
DCD always on (n=0) or DCD follows carrier (n=1)
DTR signal procedure
n=1
n=2
n=0
n=0
n = 0..2
n = 0,3..6
Guard Tone Select - Disable (n=0), Enable 550Hz (n=1) or 1800Hz (n=2)
User accessible Loopback Tests and Diagnostics
Returns current configuration
&V
'Zero-Power' state (n=0) or Powersave state (n=1)
DSP Register "n" Read - Display specified DSP Register contents
DSP Register "n" Write - Write to specified DSP Register
&Zn
n = 0,1
@Rn?
@Rn=x
n = 00..FF
n = 00..FF
Parameters
0…255
0…255
0-127
Function
Default
2
S Registers
Number of rings before answering, 0 = Auto-answer disabled
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
Number of rings received
0
Escape character value
+
0-127
Carriage return character value
Line feed character value
CR
LF
BS
4s
0-127
0-127
Backspace character value
2…255
2…255
0...255
1...255
1…255
Waiting time in seconds for dial tone or before blind dialling
Maximum waiting time in seconds for carrier
Pause time in seconds for "," dial modifier
Reserved
50s
2s
Lost carrier to hang up delay in units of 100ms
700ms
ã 2004 CML Microsystems Plc
17
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
