M7 GX Technical Manual
10
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 quality 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
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 for 3.3V
operation. The GPS antenna must have un-obstructed visibility of the sky.
6.
Connect the computer, terminal, controller, or other hardware device that will be using the
M7
modem to its DB-9 serial I/O connector using a shielded cable. Secure it to the 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
M7
chassis to an earth ground.
8.
Connect Digital Inputs. The stock
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
10. Operation
Once power is applied to the M7 GX, the internal GPS will begin to try to lock onto the GPS satellites.
The two LEDs on the front of the M7 will begin to alternately blink red back-and-forth every second.
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 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.
Refer to the
M7 GX Technical Manual
for details on all of the events that will trigger a transmission.
Installation
