Modem S Register Definitions
By Jason John Schwarz
- 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
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