Editing Hayes AT command set (section)

== Modem S register definitions ==
{| class="wikitable"
!Register!!Description!!Range!!Default value
|-
|S0
|Number of rings before Auto-Answer
|0–255 (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 synchronous 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
|}