2: Evaluation Kit
xPico® Wi-Fi® Embedded Device Server Evaluation Kit User Guide
11
Ref Des.
Connector/Header Function
JP18
Serial Port 2 Signal Header
Provides access to the module second serial port. The signals on this header have been
buffered by an RS232 transceiver.
JP19
External Power Header
Provides connection point for an external 2.2V to 5.5V power source, such as a battery.
This is connected to a 3.3V step up/down regulator that will power the evaluation board
and module circuitry.
SW1
Module Reset to Default
When pushed asserts the xPico module reset to default function.
SW2
Module Hardware Reset
When pushed asserts the xPico module hardware reset to reboot the module.
SW3
Board Power Switch
Switches ON or OFF the logic power rails.
SW4
WAKE Button
When pushed asserts the xPico module WAKE signal. Functional for xPico Wi-Fi module
only.
Serial Port 1 RS232/RS485 and Serial Port 2 RS232 Interface
The evaluation board has one multiprotocol RS-232/RS422/RS485 port and one RS232 port for
connection to the xPico internal UARTs. Serial port 1 is a DB9 type connector labeled J3.
Serial Port 2 is a 3-pin header, JP18. The null modem cable can be used to connect J3 directly
to a standard PC RS232 serial port.
Note:
The xPico Wi-Fi does not support RS485. RS485 is applicable only to the xPico.
The tables below list the RS232/RS422/RS485 signals and corresponding pins on the
evaluation board DB9 connectors. All signals at J3 are level-shifted by a multiprotocol
transceiver. JP18 is an RS232 port only.
Table 2-3 RS-232 Signals on J3 Serial Port
xPico Evaluation Board PIN FUNCTION
SERIAL PORTS
DB9
Pin #
TX_232 (Data Out)
3
RX_232 (Data In)
2
CTS_232 (HW Flow Control Input)
8
RTS_232 (HW Flow Control Output)
7
DTR_232 (Modem Control Output)
4
DCD_232 (Modem Control Input)
1
GND (Ground)
5
