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Appendix A. AT Commands and S-Registers
58 Express XRT User Guide 61202.153L3-1
maximum length for a command line is 40 characters. Each com-
mand line is executed by the Express XRT upon receipt of a termi-
nating 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 transmit-
ted, the command line can be edited by using the backspace char-
acter (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 val-
ue of the setting desired and then press Enter. The following com-
mand returns the software version of the unit:
ATI1
Using S-Registers
The configuration of the Express XRT can be changed or reviewed
with S-registers. See the section S-Register List on page 63 for a de-
scription 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 fol-
lowed by a question mark and press Enter.
ATS0?
Reading an S-Register String
The Express XRT uses S-register strings to store strings of digits
for stored phone numbers, SPIDs, etc. Type ATSS followed by
the number of the string S-register to be read followed by a ques-
tion mark and press Enter.
ATSS80?
Changing an S-Register
Type ATS followed by the number of the S-register to be changed,
an equal sign, the numeric value to be assigned to the register,
then press Enter.
ATS0=2