Installation guide
5-20
18  AT&G  Select guard time  reply “OK” only 
19  AT&R  Serial port RTS option command  reply “OK” only 
20  AT&S  Serial port DSR control  reply “OK” only 
21 AT&V  View settings   
22 AT&W 
Write current settings to flash for 
next boot up 
S Registers 
No.  S Register  Description & default value  Remarks 
1  S0  Ring to auto-answer (default=0)   
2  S1  Ring counter (always=0)  no action applied 
3 S2 
Escape code character (default=43 ASCII 
“+”) 
4  S3  Return character (default=13 ASCII)   
5  S4  Line feed character (default=10 ASCII)   
6 S5  Backspace character (default= 8 ASCII)  
7 S6 
Wait time for dial tone (always=2, 
unit=sec) 
no action applied 
8 S7 
Wait time for carrier (default=3, 
unit=sec) 
9 S8 
Pause time for dial delay (always=2, 
unit=sec) 
no action applied 
10 S9 
Carrier detect response time 
(always=6, unit 1/10 sec) 
no action applied 
11 S10 
Delay for hang up after carrier 
(always=14, unit 1/10 sec) 
no action applied 
12 S11 
DTMF duration and spacing 
(always=100 ms) 
no action applied 
13 S12 
Escape code guard time 
(default=50, unit 1/50 sec) 
to control the idle time for “+++” 










