V.22 bis Modem with AT Commands
CMX866
Parameters
5…255
Function
DTMF tone duration and interdigit pause duration in units of 10ms
Escape code guard time in units of 50ms
Reserved
Default
100ms
1s
S Registers
S11
S12
0…255
S13
S14
0…255
0…255
0…255
0…255
0…255
General Options
$92
80ms
60ms
30s
S15
Loopback carrier off time in units of 10ms
Drop time for loopback in units of 10ms
Handshake timeout (Answering) in seconds
Loopback timer (0= no timeout) in seconds
Reserved for test functions
S16
S17
S18
0s
S19
S20
Reserved
S21
0…255
0…255
0…255
0…255
0…255
0…255
0…255
0…255
0…255
Loopback and Power states
$10
$C0
$00
S22
Calling and response characteristics selection
Guard tone selection
S23
S24
Equaliser, DCD, DTR status and modulation fallback
TX Gain, TX data format
$A9
$B0
$30
S25
S26
RX Gain, RX data format, overspeed (2.3% default) setting
Communications Protocol
S27
$00
S28
RTSN Timeout for return to Command mode from Data mode in seconds
Timed Break Recall period in units of 10ms
0s
S29
300ms
Parameter
Communications Protocol
(Mapped to S27 register)
V.22bis 2400bps QAM
Fallback
Bn Register
n
0
1
2
3
4
5
6
7
8
9
V.22
V.22 1200bps DPSK
V.23 Tx 75bps, Rx 1200bps (Master)
V.23 Tx 1200bps, Rx 75bps (Slave)
Reserved
V.21 300bps FSK
Bell 212A 1200bps DPSK
Bell 202 Tx 150bps Rx 1200bps
Bell 202 Tx 1200bps Rx 150bps
Bell 103 300bps FSK
Xn Register
Parameter
Calling and Response Characteristics
(Mapped to S22 register)
n
0
Ignore dial tones and busy tones, return CONNECTxxxx or NO CARRIER
Ignore busy tone, wait for dial tone to dial. Return NO DIAL TONE or
CONNECT xxxx or NO CARRIER
1
2
3
Ignore dial tone. If busy tone detected, return BUSY. Return CONNECT xxxx
Return NO DIAL TONE, BUSY, CONNECT xxxx, or NO CARRIER
ã 2004 CML Microsystems Plc
18
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
