User guide

Chapter 5 - AT Commands

Defines backspace character by its decimal ASCII code. Default setting is the ^H character

(decimal 8), the code for BACKSPACE on most keyboards. Can be set for any ASCII

character. Setting S2 to a value greater than 32 disables the backspace character.

Note: If you change the S5 value, you must make corresponding changes in your data communications

software.

S6 Wait Time for Dial Tone

Unit: 1 second

Range: 2–65 (North America), 4–255 (International), 4–7 (U.K.)

Default: 2 (North America), 4 (International and U.K.)

Defines length of time the modem waits after ENTER is pressed before carrying out a dial

command. Default setting is two seconds for North America, four seconds elsewhere.

S7 Time to Wait for Carrier

Unit: 1 second

Range: 1–255 (USA), 1–45 (Canada and International), or 1–55 (UK)

Default: 50 (North America and International) or 55 (U.K.)

Determines amount of time the modem waits for a carrier signal before it disconnects. Default

value is 50 seconds except the UK model, which defaults to 55 seconds. After dialing, the

modem waits for a carrier signal for up to 50 or 55 seconds and if none is detected, terminates

the call. Maximum S7 value is 255 seconds for the US model, 45 seconds for Canadian and

International models, and 55 seconds for the UK model. S7 also determines the wait for

silence time for the @ dial modifier.

S8 Pause Time for Comma

Unit: 1 second

Range: 0–65 (North America), 4–255 (International), 4–7 (UK)

Default: 2 (North America), 4 (International and UK)

Determines the length of pause caused by a comma character in a dialing command. Default

setting is two seconds for North American model and four seconds for international and UK

models. S8 can be set for up to 65 seconds. S8 also defines the length of time the modem waits

before retrying a call after it detects a busy signal. Some computer systems need more than

two seconds to reset. If this is the case, increase the value of S8.

S10 Carrier Loss Disconnect Delay Time

Unit: 100 ms

Range: 1–254

Default: 20

Defines the length of time, in milliseconds, that the modem waits after a loss of carrier signal

before the it disconnects. The default setting is 2000 ms (20 units of 100 ms each). Maximum

delay is 25400 milliseconds, or 25.4 seconds (decimal 254).

S11 Tone Dialing Spacing and Duration

Unit: 1 ms

Range: 50 - 150 (US) or 80–255 (Canada, UK, International)

Default: 95 (US) or 80 (Canada, UK, International)