M7 GX Technical Manual
61
Raveon Technologies Corp.
connected, you device may not be outputting data to the
RV-M7
. If the TX LED blinks, the
RV-M7
is
transmitting data. Every time data enters the modem, the TX LED should blink
Solution #2
.
Verify that serial port timeout is OK. The ATG0 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 20000, this
means 2 seconds, and the modem may simply be waiting a long time
Solution #3
.
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).
Solution #4
.
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 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 RS-232 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. RS-
232 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 (RS-232 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
