Hayes Command Set - Modem S Register Definitions

Modem S Register Definitions

Register Description Range Default value
S0 Number of rings before Auto-Answer 0–0 never 0
S1 Ring Counter 0–255 rings 0
S2 Escape character 0–255, ASCII decimal 43 ("+")
S3 Carriage Return Character 0–127, ASCII decimal 13 (Carriage Return)
S4 Line Feed Character 0–127, ASCII decimal 10 (Line Feed)
S5 Backspace Character 0–32, ASCII decimal 8 (Backspace)
S6 Wait Time before Blind Dialing 2–255 seconds 2
S7 Wait for Carrier after Dial 1–255 seconds 50
S8 Pause Time for Comma (Dial Delay) 0–255 seconds 2
S9 Carrier Detect Response Time 1–255 tenths of a seconds 6 (0.6 second)
S10 Delay between Loss of Carrier and Hang-Up 1–255 tenths of a second 14 (1.4 seconds)
S11 DTMF Tone Duration 50–255 milliseconds 95 milliseconds
S12 Escape Code Guard Time 0–255 fiftieths of a second 50 (1 second)
S18 Test Timer 0–255 seconds 0 seconds
S25 Delay to DTR 0–255 (seconds if sychronous mode, hundredths of a second in all other modes) 5
S26 RTS to CTS Delay Interval 0–255 hundredths of a second 1 hundredth of a second
S30 Inactivity Disconnect Timer 0–255 tens of seconds 0 (disable)
S37 Desired Telco Line Speed 0–10

Command options:

  • 0 Attempt auto mode connection
  • 1 Attempt to connect at 300 bit/s
  • 2 Attempt to connect at 300 bit/s
  • 3 Attempt to connect at 300 bit/s
  • 5 Attempt to connect at 1200 bit/s
  • 6 Attempt to connect at 2400 bit/s
  • 7 Attempt to connect in V.23 75/1200 mode.
  • 8 Attempt to connect at 9600 bit/s
  • 9 Attempt to connect at 12000 bit/s
  • 10 Attempt to connect at 14400 bit/s
 0
S38 Delay before Force Disconnect 0–255 seconds 20 seconds

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