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Iridium 9523 Product Developers’ Guide is Subject to Change Without Notice
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6 S-Register Definitions
S-registers allow control over specific Iridium 9523 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.
6.1 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.
6.1.1 Sr - Direct S-Register Reference
Set a pointer to reference S-register r.
6.1.2 Sr? - Direct S-Register Read
Read the value of S-register r.
6.1.3 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.
6.1.4 ? - 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.
6.1.5 =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.
6.2 Standard S-Registers
Table 16: Standard S-Registers
Register
Number
Range Default Description
Sr=n Command
Write Protected
in SAC0201
S0 0-255 0 Autoanswer. Assigning a value from 1 to 255 in
register S0 tells the Iridium 9523 to automatically
answer incoming calls. The factory setting of 0 turns off
the automatic answer feature.
Register S15 controls the type of call to be
automatically answered.
S1 0-255 0 Ring count Yes
S2 0-255 43 Escape code character
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