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AT
Command
Symbol Peak Deviation
R0
transmit symbols. Note: This can be a negative number to
invert the modulation.
Select CD pin output signal – CD may be RF carrier detect,
R1
or modem data detect.
Over-The-Air bit rate - This is the data rate the radio uses
to send data over the air. All RF modems in the network
R2
must use the same over-the-air baud rate. Refer to
section 7.6 for information on how to set the OTA baud rate.
Serial Port time out – Number of mS of no activity on the
R3
serial port before transmitting the data in its buffer.
Preamble length – The number of bytes to send over-the-air
R5
in the pre-amble.
Frequency Offset.
R8
radio channel.
R9
Modulation Balance.
Select RF CD output threshold – This value is the RSSI
RA
threshold where the carrier detect is asserted. Note: To force
CD always on, set this to 0, and R1 to RF Carrier Detect.
12.3.
Center Frequency
1. Key the transmitter with CW output using this command:
ATTD 7
2. The modem will now put out CW on the center of the channel.
3. Read the frequency offset with the ATR8 command.
4. Adjust the frequency to the center of the channel with the ATR8
command. You can use the "U" key and the "D" key to change the
settings up and down one value in real time.
12.4.
TX Deviation
1. Switch to channel 1.
2. Key the transmitter into a 50 ohm load using the ATTD 3 command. The
unit will now transmit, and send a digital 0 continuously. This should be
+2.0kHz in frequency for narrow-band radios (12.5kHz spaced channels)
and +4.0kHz for wide-band (25kHz channels).
Company Confidential
Command Description
– Set the peak FM deviation of the
Used to set the radio on the center of the
52
Parameters
Range: -1000 – 1000
Range : 0 - 2
2 = Always assert CD
1 = Data CD
0 = RF CD
Range:
0 = 800
5 = 9600 2L
1 = 1200
6 = 19200 4L
2 = 2400
7 = 5142 2L
3 = 4800
8 = 9600 4L
4 = 8000 4L 9 = 2000 2L
Range: 1 - 5000
Range: 3 - 255
Range: -500 to +500
Range: 0-100
Range : 0-999
Raveon Technologies Corp.
Factory
Default
120**
1
3
20 (mS)
4**
(Varies based
on data rate
and radio
type. 7 typical)
0**
20**
300**
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