Fastrax ITrax02 User Manual - page 8
2002-12-12
Page 8 of 20
Evalkit User Manual
2
3
RX
TX
2
3
RX
TX
5
GND
5
GND
Figure 3 Null modem cable with minimum connections
1.4 On/Off/Reset switch
The switch located on the back panel has a two-fold purpose:
1. Function as an ON/OFF switch
2. Function as an external RESET switch for the iTRAX02 receiver
The switch is of SPDT (Single Pole, Double Throw) – On-Off-Mom
type and the positions are following:
Position Function Comment
Left
OFF
Power off, LED turns off
Middle
ON
Power on, LED turns on
Right
RESET
Power on, LED is on, iTRAX02 gets RESET
Note that the switch returns to ON position after the switch is released
in the RESET position.
1.5 Led Array
The red led array indicates the corresponding GPIO 0…15 state: led
active means logical ‘low’ state (see Appendices for description of the
default firmware GPIO usage).
1.6 GPS antenna
The GPS antenna supplied with the Evaluation Kit is SM-66 from San
Jose Navigation Inc. The antenna is a high performance GPS patch
antenna with a low noise amplifier, suitable bias voltage is
+4.5…+5.5VDC. The net antenna gain including 5 meters cable loss
is about +20dB. Connect the antenna cable to the ANT connector
(SMA).