Fastrax ITrax02 User Manual - page 12
2002-12-12
Page 12 of 20
Evalkit User Manual
3.
SETTING UP THE HARDWARE
3.1 Jumper settings for antenna bias (I/O-connector)
The antenna port on iTRAX02 can be supplied with an external bias.
On the Evaluation Kit the bias can be either +5V or +3.3V. The
following jumper settings are available on the 40-pin I/O-connector
(X6) on the back panel (see figure 1):
Antenna bias
X6 I/O-connector jumper setting
No bias
-
+3.3V 37
–38
+5V (factory default)
37 –38 and 39 – 40
3.2 Jumper settings for Boot-mode select (I/O-connector)
The iTRAX02 is factory preset for booting from the internal flash
memory. There is however the option for booting through RS232
interface (Port 0) by setting GPIO 15 to logical “0”. For this purpose a
jumper is placed across X6-27 – X6-28 (GPIO 15) on the 40-pin I/O-
connector on the back panel, see
figure 1
.
Onwards from PCB rev. D, the Boot-mode select is also controlled
automatically with GPS Workbench via RS232 RTS hand-shake
signal.
3.3 Jumper settings for serial interface (internal)
The RS232-interface is available as true RS232 signals (inverted +/-
10V) at connectors X3 (Port 0) and X5 (Port 1). This requires that the
jumpers across X25 are connected (factory default): X25-1 – X25-2,
X25-3 – X25-4, X25-5 – X25-6 and X25-7 – X25-8.
The serial interface signals (CMOS levels) are also available at
connector X25. In this case the jumpers must be removed.
3.4 Jumper settings for power supply (internal)
The jumpers across X4-1- X4-2 (+3V_BB) and X4-3 – X4-4 (+3V_RF)
provide separate voltages for the iTRAX02 receiver (factory default).