RV-M7 Technical Manual
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.
Symptom: Long delay before transmitting
Solution #1. Verify that serial port timeout is OK. The ATR3 command sets the number of milliseconds that
the 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 means 2 seconds, and the modem may simply
be waiting a long time. Typical settings for this parameter are 20 (20mS).
Symptom: Cannot enter Command Mode
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. Handshaking. You may have hardware handshaking enabled on your terminal program, but the
hardware or cable may not support it. Disable hardware handshaking on your terminal program to verify this
is the issue.
Symptom: Modem appears dead.
Solution #1. Verify the power is on. When the modem has good DC power, the PWR LED will blink once per
second. If it is not blinking, either the modem does not have power, the modem is broken, or the LEDs have
been disabled via the ATL0 command.
Solution #2. Verify the internal fuse OK. There is an internal fuse in the RV-M7, protecting it from reverse-
voltage and electrical failures. If the power LED does not blink or come on when DC is applied, check the fuse
and replace it with the same type 3-amp mini fuse, and try again. If you replace the fuse, the unit must be
carefully check for damage and proper operation before being installed. If you replace the fuse, you must use
a Littlefuse brand fuse, part number 0297003 or Raveon part, number 1X726-3 to maintain calibration of your
unit.
Solution #3. Verify Low Power Mode. The M7 has an optional Low Power Mode (LPM). If LPM is enabled,
the M7 will power down whenever the DTR line of the serial port is turned off. The Power LED will blink once
every 10 seconds in the LPM mode. The ATSM command is used to set or read the Low Power Mode. ATSM 1
enables it, and ATSM 0 disables it. If LPM is used (ATSM 1), then the M7 will turn off when the DTR line is off,
or the program connected to the serial port is closed, or the RS-232 connector is unplugged.
Symptom: Repeater will not repeat.
Solution #1. Verify the repeater’s Unit ID is unique. An RV-M7 configured to be a repeater will not repeat
messages it originated. If other units in the system have the same ID as the repeater, the repeater will not
repeat them because it thinks the it originated the transmission. Set the MTID of the repeater to a unique ID
number.
(10 pages)
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