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Appendix A. AT Commands and S-Registers
52 Express XR/XRT Quick Start Guide 61200.153L1-13
commands may be separated with spaces for readability. The
maximum length for a command line is 40 characters. Each
command line is executed by the Express XR/XRT upon receipt
of a terminating character. The default terminating character is a
carriage return (ASCII 013), but it can be changed by writing a
different value to register S3. Before the terminating character is
transmitted, the command line can be edited by using the
backspace character (ASCII 008) to erase errors so the proper
commands can be entered.
Using an AT Command
Type AT followed by the letter of the command and numeric
value of the setting desired and then press Enter. The following
command returns the software version of the unit:
ATI1
Using S-Registers
The configuration of the Express XR/XRT can be changed or
reviewed with S-registers. See the section S-Register List in this
chapter for a description of each S-register and its corresponding
range of values.
Reading an S-Register
Type ATS followed by the number of the S-register to be read
followed by a question mark and press Enter.
ATS0?
Reading an S-Register String
The Express XR/XRT uses S-register strings to store strings of
digits for stored phone numbers, SPIDs, etc. Type ATSS fol-
lowed by the number of the string S-register to be read followed
by a question mark and press Enter.
ATSS80?