Hayes command set
Modem S register definitions

Hayes command set

Section Title: Modem S register definitions
Table Section Text: None

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.	0

S38	Delay before Force Disconnect	0–255 seconds	20 seconds

Sentence(s)

Carriage return character is the S3 register command.

final_sentence: Carriage return character is the S3 register command.