Serial Interface; Table 2-8 Xpico 110 Serial Port Signals - Lantronix xPico 110 Integration Manual

Serial Interface

The xPico 110 has two external serial interfaces. The signal levels on the serial interface are
3.3V logic level with 5V tolerant inputs. The serial interfaces require an external transceiver in
order to connect to external RS232, RS485, or RS422 networks. The signals of Serial Port 1 may
be connected as shown in the reference schematic,
transceiver shown in the reference schematic is of type Exar, part number SP336. This
transceiver is a multiprotocol RS232, RS485, RS422 transceiver. Single protocol transceivers
may be used as required. The xPico interface may also be directly connected to the UART
interface of an external CPU. Serial Port 2 is a three wire interface only. It operates like Serial
Port 1, except it does not support hardware Flow Control (i.e. no RTS/CTS) and modem control
(i.e. no DTR/DCD). It is highly recommended to connect RTS and CTS for serial port 1.
Signal
TXD1
RTS1
RXD1
CTS1
TXD2
RXD2
xPico® 110 Wired Device Server Integration Guide

Table 2-8 xPico 110 Serial Port Signals

Pin Description
57 Serial Transmit Data output
55 Serial Ready-to-Send / Serial Transmit enable
56 Serial Receive Data input
54 Serial Clear-to-Send
53 Serial Transmit Data output 2
52 Serial Receive Data input 2
2: Functional Description
Figure 2-9 serial port example, below. The
Reset State
Output
Output
Input
Input
Output
Input
15