2: Evaluation Kit
xPico® Wi-Fi® Embedded Device Server Evaluation Kit User Guide
12
Table 2-4 RS-422 4-Wire Signals on J3 Serial Port
xPico Evaluation Board PIN FUNCTION
SERIAL PORTS
DB9
Pin #
TX- (Data Out)
3
RX+ (Data In)
2
TX+ (Data Out)
7
RX- (Data In)
8
GND (Ground)
5
Table 2-5 RS-485 2-Wire Signals on J3 Serial Ports
xPico Evaluation Board PIN FUNCTION
SERIAL PORTS
DB9
Pin #
TX-/RX- (Data IO)
3
TX+/RX+ (Data IO)
7
GND (Ground)
5
The J3 DB9 port is configured for RS232, RS422 (4-wire), or RS485 (2-wire) by jumper settings
on JP11 and JP12.
lists the correct jumper installation for each mode. The xPico Wi-
Fi does not support RS485. RS485 is applicable only to the xPico.
Table 2-6 JP11 and JP12 Jumper Settings for Serial Port 1 (J3)
xPico Evaluation Board Serial
Port 1 Mode (J3)
JP11
JP12
RS232 (Default)
OUT
OUT
RS485 2-wire
IN
IN
RS422 4-wire
IN
OUT
JP18 is for connection to the module second serial port through an RS232 transceiver. The pin
assignments for JP18 are listed below. The xPico Wi-Fi does not support RS485. RS485 is
applicable only to the xPico.
Table 2-7 JP18 Serial Port 2 RS232 Connections
xPico Evaluation Board Serial Port 2
JP18 pin
TX RS232 output
1
Signal Ground
2
RX RS232 input
3
