
Si2400
Rev. 1.3 43
8. S Registers
Any register not documented here is reserved and should not be written. Bold selection in bit-mapped registers
indicate default values.
Table 27. S-Register Summary
“S”
Register
Register
Address
(hex)
Name Function Reset
S00 0x00 NR Number of rings before answer; 0 suppresses auto answer.
0x00
S01 0x01 DW Number of seconds modem waits before dialing after going
off-hook (maximum of 109 seconds).
0x03
S02 0x02 CW Number of seconds modem waits for a dial tone before hang-up
added to time specified by DW (maximum of 109 seconds).
0x14
S03 0x03 CLW Duration that the modem waits (53.33 ms units) after loss of car-
rier before hanging up.
0x0E
S04 0x04 TD Both duration and spacing (5/3 ms units) of DTMF dialed tones.
0x30
S05 0x05 OFFPD Duration of off-hook time (5/3 ms units) for pulse dialing.
0x18
S06 0x06 ONPD Duration of on-hook time (5/3 ms units) for pulse dialing.
0x24
S07 0x07 MF1 This is a bit mapped register.
1
0x01
S08 0x08 MNRP Minimum ring period (5/3 ms units).
2
0x0A
S09 0x09 MXRP Maximum ring period (5/3 ms units).
2
0x28
S0A 0x0A ROT Ringer off time (53.333 ms units).
2
0x4B
S0B 0x0B MNRO Minimum ringer off time (10 ms units).
2
0x08
S0C 0x0C MF2 This is a bit mapped register.
1
0x00
S0D 0x0D RPE Ringer off time allowed error (53.333 ms units).
2
0x16
S0E 0x0E DIT Pulse dialing Interdigit time (10 ms units added to a minimum
time of 64 ms).
0x46
S0F 0x0F TEC TIES escape character. Default = +.
0x2B
S10 0x10 TDT TIES delay time (256
z
5/3 ms units).
0x07
S11 0x11 ONHI This is a bit mapped register.
1
0x48
S12 0x12 OFHI This is a bit mapped register.
1
0x40
S13 0x13 MF3 This is a bit mapped register.
1
0x10
S14 0x14 MF4 This is a bit mapped register.
1
0x00
S15 0x15 MLC This is a bit mapped register.
1
0x84
S16 0x16 BTON Busy tone on. Time that the busy tone must be on (10 ms units)
for busy tone detector.
0x32
Notes:
1. These registers are explained in detail in the following section.
2. The ring detector will only detect ringing if the ring burst on/off times meet the settings in MNRP, MXRP, MNRU, ROT,
and REP.
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