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11. Troubleshooting
Symptom: Unit will not receive
Solution
#1.
Verify that the unit is on the correct RF channel. If it is, the Status LED should blink
green every time another modem tries to transmit to it. If the Status LED does not blink when it
should be receiving, it is on the wrong RF frequency.
Solution
#2.
If the Status LED blinks green, verify that the Unit Address of the sending modem
matches the unit address of the receiving modem. If this is OK, verify that the over-the-air baud rate
of all modems is the same (ATR2 command).
Solution
#3.
Verify the KEYPHRASE is correct. If encryption is used, the KEYPHRASE is set to
a unique word, and must be the same in all radios in the system. If it is not used in the radio
system, then the KEYPHRASE in all units must be disabled or left at the factory default. To disable
encryption, use the KEYPHRASE 0 command. The factory default KEYPHRASE is RAVEON, in all
capitol letters.
Solution
#3.
Verify the Receiver circuits are powered. The receiver circuitry by default is
disabled (ATSM 4). If you wish to receive data with the ATALS PL, you must enable the receiver
circuits, increasing the current draw a little bit. ATSM 0 enables the receiver circuits.
Symptom: Unit will not transmit
Solution
#1.
Verify that the GPS is locked. If the Status LED is blinking twice per second, the
internal GPS is not receiving a signal from the GPS satellites, and thus, the unit will not transmits.
Locate the ATLAS PL in a lace where it can receive a GPS signal.
Solution
#2.
Verify that the radio channel is clear or BCL is off. The ATBC 1 command enables
Busy Channel Lockout. If BCL is on, the modem will not transmit on a busy channel. The ATBC 0
command turns it off, and thus the modem will transmit when it needs to, regardless if the channel is
busy. The Status led on the front of the modem is illuminated green whenever the radio channel is
busy (RF present).
Symptom: Receive light blinks, but no data is received
Solution
#1.
Verify the serial port baud rate. This is difficult if it is set wrong, because you
cannot enter the command mode to check it. Try all possible baud rates, and see if one of them
works with the modem. Alternately, remove the rear cover of the modem, and press the CONFIG
button. This will force the modem into the Command Mode, as well as set the serial port to 9600
baud, 8 data bits, one stop, and no parity. If the baud-rate was OK, verify the AT, BT and CT times,
that they are long enough for you to enter the +++ string.
Solution #2
Verify the KEYPHRASE is correct. If encryption is used, the KEYPHRASE is set to
a unique word, and must be the same in all radios in the system. If it is not used in the radio
system, then the KEYPHRASE in all units must be disabled or left at the factory default. To disable
encryption, use the KEYPHRASE 0 command. The factory default KEYPHRASE is RAVEON, in all
capitol letters.
Symptom: Long delay before transmitting
Solution
#1.
Verify that serial port timeout is OK. The ATR3 command sets the number of
milliseconds that the RV-M7 will look for in the serial input data stream. If a pause greater than this
value happens, the modem will transmit. If the ATG0 parameter is set very large, say 2000, this
M7 PL Technical Manual
38
Raveon Technologies Corp.
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