Modem S Registers

S0
Number of rings before Auto-Answer

Range: 0-255 rings
Default: 0
S1
Ring Counter

Range: 0-255 rings
Default: 0
S2
Escape character

Range: 0-255, ASCII decimal
Default: 43
S3
Carriage Return Character

Range: 0-127, ASCII decimal
Default: 13 (Carriage Return)
S4
Line Feed Character

Range: 0-127, ASCII decimal
Default: 10 (Line Feed)
S5
Backspace Character

Range: 0-32, ASCII decimal
Default: 8 (Backspace)
S6
Wait Time before Blind Dialing

Range: 2-255 seconds
Default: 2
S7
Wait for Carrier after Dial

Range: 1-255 seconds
Default: 50
S8
Pause Time for Comma (Dial Delay)

Range: 0-255 seconds
Default: 2
S9
Carrier Detect Response Time

Range: 1-255 tenths of a seconds
Default: 6 (0.6 second)
S10
Delay between Loss of Carrier and Hang-Up

Range: 1-255 tenths of a second
Default: 14 (1.4 seconds)
S11
DTMF Tone Duration

Range: 50-255 milliseconds
Default: 95 milliseconds
S12
Escape Code Guard Time

Range: 0-255 fitieths of a second
Default: 50 (1 second)
S18
Test Timer

Range: 0-255 seconds
Default: 0 seconds
S25
Delay to DTR

Range: 0-255 (seconds if sychronous mode, hundredths of a second in all other modes)
Default: 5
S26
RTS to CTS Delay Interval

Range: 0-255 hundredths of a second
Default: 1 hundredth of a second
S30
Inactivity Disconnect Timer

Range: 0-255 tens of seconds
Default: 0 (disable)
S37
Desired Telco Line Speed

Range: 0-10
Default: 0
Command options:

S37=0
Attempt auto mode connection
S37=1
Attempt to connect at 300 bps
S37=2
Attempt to connect at 300 bps
S37=3
Attempt to connect at 300 bps
S37=5
Attempt to connect at 1200 bps
S37=6
Attempt to connect at 2400 bps
S37=7
Attempt to connect in V.23 75/1200 mode.
S37=8
Attempt to connect at 9600 bps
S37=9
Attempt to connect at 12000 bps
S37=10
Attempt to connect at 14400 bps
S38
Delay before Force Disconnect

Range: 0-255 seconds
Default: 20 seconds