Table 2-4 Rs-422 4-Wire Signals On J3 Serial Port; Table 2-5 Rs-485 2-Wire Signals On J3 Serial Ports; Table 2-6 Jp11 And Jp12 Jumper Settings For Serial Port 1 (J3); Table 2-7 Jp18 Serial Port 2 Rs232 Connections - Lantronix xPico Wi-Fi Series User Manual

The J3 DB9 port is configured for RS232, RS422 (4-wire), or RS485 (2-wire) by jumper settings
on JP11 and JP12.
Fi does not support RS485. RS485 is applicable only to the xPico.
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.
xPico® Wi-Fi® Embedded Device Server Evaluation Kit User Guide

Table 2-4 RS-422 4-Wire Signals on J3 Serial Port

xPico Evaluation Board PIN FUNCTION
SERIAL PORTS
TX- (Data Out)
RX+ (Data In)
TX+ (Data Out)
RX- (Data In)
GND (Ground)

Table 2-5 RS-485 2-Wire Signals on J3 Serial Ports

xPico Evaluation Board PIN FUNCTION
SERIAL PORTS
TX-/RX- (Data IO)
TX+/RX+ (Data IO)
GND (Ground)
Table 2-5 lists the correct jumper installation for each mode. The xPico Wi-

Table 2-6 JP11 and JP12 Jumper Settings for Serial Port 1 (J3)

xPico Evaluation Board Serial
Port 1 Mode (J3)
RS232 (Default)
RS485 2-wire
RS422 4-wire

Table 2-7 JP18 Serial Port 2 RS232 Connections

xPico Evaluation Board Serial Port 2
TX RS232 output
Signal Ground
RX RS232 input
DB9
Pin #
3
2
7
8
5
DB9
Pin #
3
7
5
JP11 JP12
OUT OUT
IN IN
IN OUT
JP18 pin
1
2
3
2: Evaluation Kit
12