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APPENDIX B: S-REGISTER DEFINITIONS
S-registers allow control over specific A3LA-RM operations. Some S-registers contain a single numeric
value. Other S-registers are bit mapped where individual bits, or sets of bits, control specific functions.
B.1 S-Register Commands
Commands allow S-registers to be read, written, or simply referenced (i.e. set a pointer to designate the
current, referenced S-register). S-register commands are described in the following subsections.
B.1.1 Sr – Direct S-Register Reference
Set a pointer to reference S-register r.
B.1.2 Sr? – Direct S-Register Read
Read the value of S-register r.
B.1.3 Sr=n – Direct S-Register Write
Set the value of S-register r to n, where n is a decimal value in the range 0 to 255.
B.1.4 ? – Referenced S-Register Read
Read the value of the current referenced S-register. The current referenced S-register is that
which was last acted upon by a direct reference (ATSr), read (ATSr?), or write (ATSr=n)
command.
B.1.5 =n – Referenced S-Register Write
Set the value of the current referenced S-register to n. The current referenced S-register is that
which was last acted upon by a direct reference (ATSr), read (ATSr?), or write (ATSr=n)
command.
B.2
Standard S-Registers
Register
Number
Range
Default
Description
Sr=n Command
Write Protected
in SAC0201
S3
0
127
13
Carriage return character
S4
0
127
10
Line feed character
S5
0
32
8
Backspace character
S6
0
255
4
Wait for dial-tone
No action, compatibility only
S7
0
255
50
Communication standard used by A3LA-RM
No action, compatibility only
S8
0
255
4
Pause time for comma
No action, compatibility only
S9
0
255
6
Carrier detect response time
No action, compatibility only
