__________________________________________________________________________ 2 Connectors
PolaRx3e Product Family Hardware Manual v1.1.0
12
UTP CAT5e cables are recommended.
Crossed connection (Ethernet to PC):
Receiver side: ODU 4 pins (male)
1
TxD+
2
TxD-
3
RxD+
4
RxD-
PC side: RJ45 (male)
1
Tx+
2
Tx-
3
Rx+
4
5
6
RX-
7
8
Straight connection (Ethernet to hub/switch):
Receiver side: ODU 4 pins (male)
1
TxD+
2
TxD-
3
RxD+
4
RxD-
HUB/SWITCH side: RJ45 (male)
1
Tx+
2
Tx-
3
Rx+
4
5
6
RX-
7
8
2.2.4
IN
The 7-pin IN connector is in fact an I/O connector: it contains various digital inputs and outputs.
Pin # Description
1
not used
2
GND
3
GP1 output, 3.3V CMOS. Use the command
setGPIOFunctionality
to
set the level of this pin.
4
RESET, 3.3V CMOS, 10k
pull up resistor. Must be low for at least 1ms for
RESET to occur.
5
EVENTA, 3.3V CMOS, 5V tolerant, 4.7k
pull down resistor. This is the first
digital input for external event timing, see Firmware User Manual for operation.
6
EVENTB, 3.3V CMOS, 5V tolerant, 4.7k
pull down resistor. This is the
second digital input for external event timing, see Firmware User Manual for
operation.
7
ANT_EXT, external antenna power. Can be used to apply an external supply
voltage to the antenna. The voltage applied to ANT_EXT (V
ANT
) determines the
voltage source on the MAIN connector, as follows:
1
1
