Lantronix xPico Wi-Fi Pi Plate User Guide - Page 8

Serial Port 1, Evaluation Kit, xPico® Wi-Fi® Pi Plate User Guide

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2: Evaluation Kit JP JP17 JP17 JP17 JP17 JP3 JP5 JP2 JP2 JP2 JP2 JP2 JP2 JP2 JP2 JP2 JP2 JP6 JP10 JP11 J1 Position 5-6 7-8 9-10 11-12 1-2 1-2 1-2 3-4 5-6 7-8 9-10 11-12 13-14 15-16 17-18 19-20 1-2 1-2 1-2 Label RXD2 TXD2 DEFAULTS RESET TX RX CP1 CP2 CP3 CP4 CP5 CP6 CP7 CP8 RTS1 CTS1 Power 3.3V GND Function Default Install to route xPico Wi-Fi module second serial port Installed to J9 via the on board USB to serial converter Install to route xPico Wi-Fi module second serial port Installed to J9 via the on board USB to serial converter Install to use Defaults input and button, SW2 Installed Install to use Hardware Reset input and button, SW3 Installed Install position 1-2 to connect xPico module TXD1 to Installed Raspberry Pi computer board serial RX. Install position 1-2 to connect xPico module RXD1 Installed to Raspberry Pi computer board serial TX. Breakout header for CP1 Installed Breakout header for CP2 Installed Breakout header for CP3 Installed Breakout header for CP4 Installed Breakout header for CP5 Installed Breakout header for CP6 Installed Breakout header for CP7 Installed Breakout header for CP8 Installed Header for RTS1, pin 18 does not connect anywhere Installed else on the board. Header for CTS1, pin 20 does not connect anywhere Installed else on the board. Install pins 1-2 to power plate board from Raspberry Installed Pi computer board 3.3V power generated by the on board regulator Not installed Board signal ground. Not installed Connector to mate to Raspberry Pi computer board. See schematic below. Serial Port 1 Serial port 1 of the xPico Wi-Fi embedded device server has the signals TXD1, RXD1. These signals are connected to the serial port on the Raspberry Pi computer board through JP3 and JP5. The RTS1 and CTS1 signals connect to header JP2, but do not connect to the Raspberry Pi computer board. xPico Wi-Fi Pin RXD1 (7) TXD1 (10) Raspberry Pi Pin JP3,JP5: 1-2 PI_TX1 (J1 pin 8) PI_RX1 (J1 pin 10) Serial Port 2 Serial port 2 of the xPico Wi-Fi device has the signals TXD2 and RXD2. These signals go through jumpers JP17 pins 5 to 6 and 7 to 8. If the jumpers are installed the serial port is routed to an onboard USB to serial converter, which then connects to USB connector J9 on the board. xPico® Wi-Fi® Pi Plate User Guide 8

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2: Evaluation Kit
JP
Position
Label
Function
Default
JP17
5-6
RXD2
Install to route xPico Wi-Fi module second serial port
to J9 via the on board USB to serial converter
Installed
JP17
7-8
TXD2
Install to route xPico Wi-Fi module second serial port
to J9 via the on board USB to serial converter
Installed
JP17
9-10
DEFAULTS
Install to use Defaults input and button, SW2
Installed
JP17
11-12
RESET
Install to use Hardware Reset input and button, SW3 Installed
JP3
1-2
TX
Install position 1-2 to connect xPico module TXD1 to
Raspberry Pi computer board serial RX.
Installed
JP5
1-2
RX
Install position 1-2 to connect xPico module RXD1
to Raspberry Pi computer board serial TX.
Installed
JP2
1-2
CP1
Breakout header for CP1
Installed
JP2
3-4
CP2
Breakout header for CP2
Installed
JP2
5-6
CP3
Breakout header for CP3
Installed
JP2
7-8
CP4
Breakout header for CP4
Installed
JP2
9-10
CP5
Breakout header for CP5
Installed
JP2
11-12
CP6
Breakout header for CP6
Installed
JP2
13-14
CP7
Breakout header for CP7
Installed
JP2
15-16
CP8
Breakout header for CP8
Installed
JP2
17-18
RTS1
Header for RTS1, pin 18 does not connect anywhere
else on the board.
Installed
JP2
19-20
CTS1
Header for CTS1, pin 20 does not connect anywhere
else on the board.
Installed
JP6
1-2
Power
Install pins 1-2 to power plate board from Raspberry
Pi computer board
Installed
JP10
1-2
3.3V
3.3V power generated by the on board regulator
Not installed
JP11
1-2
GND
Board signal ground.
Not installed
J1
Connector to mate to Raspberry Pi computer board.
See schematic below.
Serial Port 1
Serial port 1 of the xPico Wi-Fi embedded device server has the signals TXD1, RXD1.
These
signals are connected to the serial port on the Raspberry Pi computer board through JP3 and JP5.
The RTS1 and CTS1 signals connect to header JP2, but do not connect to the Raspberry Pi computer
board.
xPico Wi-Fi Pin
Raspberry Pi Pin
JP3,JP5: 1-2
RXD1 (7)
PI_TX1 (J1 pin 8)
TXD1 (10)
PI_RX1 (J1 pin 10)
Serial Port 2
Serial port 2 of the xPico Wi-Fi device has the signals TXD2 and RXD2. These signals go through
jumpers JP17 pins 5 to 6 and 7 to 8. If the jumpers are installed the serial port is routed to an on-
board USB to serial converter, which then connects to
USB connector J9 on the board.
xPico® Wi-Fi® Pi Plate User Guide
8