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Appendix F - Modem AT Commands
RF300E/RF310E 177
S2 Escape Code Character
Unit: Decimal
Range: 0–255
Default: 43 (+)
Defines escape code character by its decimal ASCII code. Default character is the plus (+) sign
(decimal 43). S2 can be set for any ASCII character. Setting an S2 value greater than 127 results in
no escape character, resulting in no means of entering command mode from online mode without
breaking the online connection unless you use the BREAK method.
Note: If you change the S2 value, you must make corresponding changes in your data
communications software.
S3 Return Character
Unit: Decimal
Range: 0–127
Default: 13 (^M)
Defines carriage return character by its decimal ASCII code. Default setting is the ^M character
(decimal 13), the code for ENTER on most keyboards. Can be set for any ASCII character.
Note: If you change the S3 value, you must make corresponding changes in your data
communications software.
S4 Line Feed Character
Unit: Decimal
Range: 0–127
Default: 10 (^J)
Defines the line feed character by its decimal ASCII code. Default setting is ^J (decimal 10), the code
for the line feed key on most keyboards that have such a key. Can be set for any ASCII character.
S5 Backspace Character
Unit: Decimal
Range: 0–127
Default: 8 (^H)
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), 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.