M7 GX Technical Manual
43
Raveon Technologies Corp.
3.
Connect a good quality antenna, tuned to the operating frequency, to the RF
connector on the front of the modem. Use a good antenna, and place is at
as high-above obstructions as possible.
4.
A separation distance of at least 20 centimeters must be maintained
between the transmitter's radiating structures and the body of the user or
nearby persons.
5.
Connect a GPS antenna to the SMA connector of the
RV-M7 GX
. Although
a passive antenna may work if the cable length is very short, it is
recommended that an amplified antenna be used, rated at 3.3V operation.
6.
Connect the computer, terminal, controller, or other hardware device that will
be using the
RV-M7
modem to its DB-9 serial I/O connector using a shielded
cable. Secure it to the RV-M7 with the two mounting screws on the sides of
the DB-9 connector.
7.
If the antenna is mounted out doors, us a lighting arrestor in-line with the
antenna, and properly ground the antenna and the
RV-M7
chassis to an
earth ground.
8.
Connect Digital Inputs. The stock
RV-M7 GX
has up to 3 digital inputs,
using the input pins of the RS-232 serial port. An open circuit or ground is a
0, and if they are connected to a positive voltage greater than 3V, they are a
digital 1.
RS-232 Pin
Function
4 - DTR
Input 0
7 - RTS
Input 1
3 - TXD
Input 2
5 - Ground
GND
Connect to vehicle chassis or other
ground point.
8. Operation
Once power is applied to the RV-M7 GX, the internal GPS will begin to try to lock
onto the GPS satellites.
The two LEDs on the front of the RV-M7 will begin to alternately blink red back-
and-forth at a 1-second rate. (1/2 second one is red, ½ second the other is red)
This indicates the internal GPS receiver is trying to lock onto the GPS signals.
After 10 to 60 seconds, depending upon the satellite strength, the red alternating
blinking will stop. This indicates the internal GPS receiver is locked onto GPS
satellite signals, and has a position fix.
The RV-M7 GX will only transmit if it has GPS lock. If the GPS antenna is broke or
obscured, the unit will not report position or status.
When it is locked to GPS, it will transmit its position and status at the interval
programmed into the
TXRATE
parameter.
