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Appendix A: AT Command Quick Reference
Appendix A: AT Command Quick Reference
The following commands may be used when the modem is in COMMAND MODE; all are to be preceded with “AT” and followed
with [Enter]. An asterisk (*) indicates a default setting, where applicable.
Table A-1. AT Command Quick Reference.
Command
Command Name
Description
A
Answer
This command puts the modem into data mode.
Dxxxxx, DTxxxxx, DPxxxxx
Dial
Identical commands that change the unit address to xxxxx and put the
modem into data mode.
g, G
Spectrum Analyzer
Used to help determine if interfering RF signals are present.
In
Identification
Follow ATI with either of the following “n”:
1-product code
2-ROM check (OK or ERROR)
3-firmware version
4-firmware date
5-firmware copyright
6-firmware time
7-serial number
255-factory-configured options listing
N
Advanced Spectrum
Analyzer
Advanced spectrum analyzer provides for a more detailed scrutiny of the RF
environment.
O
Online Mode
This command puts the modem into data mode.
Tx
Registered Slave List
(TDMA)
? -view list
Tn=UA -set list number n equal to Remote’s Unit Address.
Tn? -view list item n
&Fn
Load Factory Default
Configuration
Follow AT&F with either of the following “n”:
1-MASTER Point-to-Multipoint, use with &F2/&F3 modems
2-SLAVE Point-to-Multipoint, works with &F1
3-REPEATER Point-to-Multipoint, works with &F1/&F2
4-SLOW MODE* MASTER Point-to-Multipoint
5-SLOW MODE* SLAVE Point-to-Multipoint
6-MASTER Point-to-Point, works with &F7
7-SLAVE Point-to-Point, works with &F6
8-SLOW MODE* MASTER Point-to-Point
9-SLOW MODE* SLAVE Point-to-Point
*SLOW MODE is optional
&Cn
DCD (Data Carrier
Detect)
Controls modem’s DCD output signal.
0-DCD always on
1-*DCD on when modem’s sync’ed, always on if Master
2-DCD used for output data framing and Modbus mode
3-Slave: DCD pulses for 2 ms when modem receives valid sync pulse from
Master (which sends sync pulse once per hop)
&Dn
DTR (Data Terminal
Ready)
Controls the action the modem performs when the DTR input line is toggled.
-follow ATD with either of the following “n”:
0-*DTR line ignored
2-deassert DTR to force modem from data mode into command mode at
S102 serial baud rate; DTR must be asserted before put ting modem back
into data mode (normally done using “ATA” command)