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9 S-Registers
9.1 Introduction
S-registers are special 8-bit stores which are used to access features that
are not available through AT commands, and to store features set by
standard commands.
Indiscriminate changing of S-registers can result in conflicting
settings which may cause the modem to malfunction.
Refer to Appendix C for UK restrictions of S-registers.
S-registers are used in two main ways: those that contain whole characters
('non-bit-mapped' registers), and those whose bits are used for different
purposes ('bit-mapped' registers).
Non-Bit-Mapped Registers
These may be sub-divided into three types:
Counters and other whole numbers. Counters are absolute values. A
zero setting will usually disable the counter.
Timers, often expressed as values from 0 to 255. Timers are stated in
increments relative to their use. Setting at zero usually disables the
timer so that the function will run until commanded to stop.
ASCII character registers, used to define a single ASCII character that
will cause the modem to perform a certain function when it receives that
character.
Bit-Mapped Registers
These registers are used to store modem features normally set with AT
commands. The 8 bits are grouped as necessary for the various options.
It is not necessary to access these registers in normal modem use, and they
are not discussed further in this manual.
X460-306851 Issue 1 9-1 Rev.0