M7 GX Technical Manual
62
Raveon Technologies Corp.
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 every two seconds. 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 RV-M7 has an optional Low Power Mode (LPM). If
LPM is enabled, the RV-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 RV-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 that it originated the transmission. Set the MYID
of the repeater to a unique ID number.
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: Transmits position, but no data.
Solution #1
.
Verify DATAMUTE is not enabled. DATAMUTE disables data transmission. It must
be set to 0 for serial port data transmission or WMX transmit data.
Solution #2
.
Verify SLOTTIME is long enough. The TDMA slot time must be long enough for
data to be transmitted in. Adjust the system slot time (SLOTTIME), or give the particular unit an
extra slot using the SLOTQTY command.
