© Microhard Systems Inc.
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Appendix A: AT Command Quick Reference
A
Answer
-
this command puts the modem into data mode
Dxxxxx, DTxxxxx, DPxxxxx
Dial
-
identical commands which 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 scru-
tiny of the RF environment.
O
Online Mode
-
this command puts the modem into data mode
Tx
Registered Slave List (TDMA)
? -view list
T
n=UA -
set list number
n
equal to Remote’s Unit Address
T
n
? -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 2ms 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
putting modem back into data mode (normally done using ‘ATA’
command)
&H0
Frequency Restriction
Follow onscreen prompts to input undesired frequencies.
&H1
Repeater Registration
When more than 1 repeater exists in a network, the repeaters
should be ‘registered’ using this command to ensure that frequen-
cies used are orthogonal to each other (thereby minimizing poten-
tial interference).
&Kn
Handshaking
-
determines handshaking between modem and host device
0-*disable handshaking
3-enable hardware (RTS/CTS) handshaking
&Sn
DSR (Data Set Ready)
-
controls modem’s DSR line and determines when it is active
0-DSR always on
1-*DSR ON in data mode, OFF in command mode
2-DTR/DSR signaling: slaves and repeaters output state of mas-
ter’s DTR on their local DSR line in PMP mode, master only out-
puts state of slave’s DTR on its local DSR line in PTP network, not
supported in P2P or E2E network.
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.
