2 s1 – ring count, 3 s2 – escape code character, 4 s3 – carriage return character – Maxim Integrated 73M2901CE AT Command User Manual

Page 22: 5 s4 – line feed character, 6 s5 – backspace character, S6 – wait to blind dial, S7 – wait for carrier after dialing, S1 – ring count, S2 – escape code character, S3 – carriage return character

73M2901CE AT Command User Guide

UG_2901CE_027

Rev.

2.0

4.4.2

S1 – Ring Count

(Default = 0)

When the modem is set for Auto-Answer, register S1 keeps track of the number of times the phone rings.
After the end of ring-on time, the S1 register is reset to 0 after the maximum of S54 or S58 seconds,
which ever is less. Range is 0 - 255 rings.

4.4.3

S2 – Escape Code Character

(Default = 43)

The S2 register contains the ASCII value of the Escape Command character. The default is 43, which is
the ASCII “+”. If you select a value greater than 127, the Escape feature is disabled and you cannot
switch from the Data State to Command State while maintaining your data connection. Range is 0 – 127
(ASCII). Default is 43 (+).

4.4.4

S3 – Carriage Return Character

(Default = 0Dh)

The S3 register contains the ASCII value of the carriage return character. This character terminates both
the command line and the result codes. Range is 0 – 127 (ASCII). Default is 13 (carriage return).

4.4.5

S4 – Line Feed Character

(Default = 0Ah)

The S4 register contains the ASCII value of the line feed character. It is used only when verbose result
codes (V1) are selected. If you do not want a line feed to be automatically sent after the return following
a verbal result code set this value to 0. Range is 0 – 127 (ASCII). Default is 10 (line feed).

4.4.6

S5 – Backspace Character

(Default = 08h)

The S5 register contains the ASCII value of the backspace character. Do not set S5 to ASCII 33 to 126
(ASCII printable characters) or to greater than ASCII 127. Range is 0 – 32 and 127 (ASCII). Default is 8
(backspace).

4.4.7

S6 – Wait to Blind Dial

(Default = 2)

The S6 register sets the number of seconds the modem waits before blind dialing. Range is 1 - 25
(seconds). Resolution is 100ms.

4.4.8

S7 – Wait For Carrier After Dialing

(Default = 50)

The S7 register performs two functions. It sets the maximum time between dialing and responding to an
incoming carrier signal. It also sets the duration of the pause generated by the W dial string modifier.
Range is 1 -254 (seconds).