Specifications

ISU AT Command Reference S-Register Definitions
Iridium Proprietary Version 2.45
20 June 2011 111
12 S-Register Definitions
S-registers allow control over specific ISU modem 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.
12.1 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.
12.1.1 Sr - Direct S-Register Reference
Set a pointer to reference S-register r.
12.1.2 Sr? - Direct S-Register Read
Read the value of S-register r.
12.1.3 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.
12.1.4 ? - 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.
12.1.5 =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.