Specifications

M7 GX Technical Manual 61 Raveon Technologies Corp.
(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 un plugged.
Solution #5. Verify trigger input bit 3 is not enabled. The RV-M7 GX has the ability to use the
TxD input pin of the RS232 port as a general-purpose digital input. If this bit is used as an input, the
RV-M7 GX modem will not transmit serial data entering the serial port. IN3 is the serial data input.
Use the TRIGBITS xx command to set which bits to use for inputs, and TRIGBITS 0 to disable all
input bits. This hint only applies to the –GX version of the RV-M7 radio modem.
Symptom: Receive light blinks, but no data is received
Solution #1. Verify Input/Output Configuration. The RV-M7 GX has numerous I/O options.
RS232 is standard, but RS485 or RS422 may be configured also. Use the ATIO command to view
how the I/O is configured. ATIO 0 is the default (RS232 mode).
Solution #2. 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 #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.
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
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 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