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means 2 seconds, and the modem may simply be waiting a long time. Typical settings for this
parameter are 20 (20mS).
Solution
#1.
This is normal. A TDMA radio will wait until its assigned TDMA slot is ready before
it will send data. A delay in transmission of the TDMATIME is normal.
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.
Solution
#3.
Deep Sleep. If the TXRATE is greater than 60 seconds, the unit may be put into a
very deep sleep mode, and will not enter the command mode. You must firt turn the unit off, and
back on to put it into the command mode.
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.
M7 PL Technical Manual
39
Raveon Technologies Corp.
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