V.22 bis Modem with AT Commands
CMX866
S-Register
Description
Reg Range Units
Default
0-255
Hex
00
S27
Communications Protocol:
Bit 3-0 - Reserved
Bit 7-4 - Communications standard:
0000 (ATB0) Selects ITU-T V.22bis at
2400bps QAM,
0001 (ATB1) Selects ITU-T V.22 at 1200bps DPSK,
0010 (ATB2) Selects ITU-T V.23 with
Tx 75bps and Rx 1200bps FSK,
0011 (ATB3) Selects ITU-T V.23 with
Tx 1200bps and Rx 75bps FSK,
0100 (ATB4) No function. Reserved for future use,
0101 (ATB5) Selects ITU-T V.21 at 300bps FSK,
0110 (ATB6) Selects Bell 212A at 1200bps DPSK,
0111 (ATB7) Selects Bell 202 with
Tx 150bps and Rx 1200bps FSK,
1000 (ATB8) Selects Bell 202 with
Tx 1200bps and Rx 150bps FSK,
1001 (ATB9) Selects Bell 103 at 300bps FSK
0-255
0-255
1s
0
S28
S29
RTSN Timeout - The timeout for validation of a change
on the RTSN pin before it is actioned by returning to
Command mode from Data Transfer mode. (0 = timeout
disabled).
10ms
30
Timed Break Recall Period - Sets the length of time
that the CMX866 breaks the line before reconnecting it
and continuing to dial the directory number.
1.5.4.6 Result Codes
Numeric Response (Decimal)
Word Response
OK
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
CONNECT
RING
NO CARRIER
ERROR
NO DIAL TONE
BUSY
CONNECT 2400
CONNECT 1200
DUAL TONE DETECT
CONNECT 300
CONNECT 1200/75
CONNECT 75/1200
CONNECT 1200/150
CONNECT 150/1200
NYI
(Not Yet Implemented)
ã 2004 CML Microsystems Plc
29
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
