Lantronix XPort User Guide

XPort® Device Server User Guide 76
9. GPIO Interface
Configurable Pins
The XPort module has three pins (CP1-3) that you can configure for General Purpose I/O
(GPIO).
Note: You can also configure the pins for serial port control lines, such as hardware control,
modem control (CTS, RTS, DTR, and DCD), and diagnostic outputs to LED, using
DeviceInstaller.
You can use these GPIO pins to control devices such as relays, servers, lights, monitor
switches, sensors, and even processes such as data transfer.
You can set the functions for the three pins independently and in any combination. The initial
directions (input/output) and active levels (active low or high) at boot up can also be
configured through 77FE, for example, by using DeviceInstaller.
This chapter describes how the directions, active levels, and states can be dynamically
controlled and probed through special port 77F0.
The configurable pins default configuration is:
Function: General Purpose Input
Active Level: Active Low
Features
 TCP and UDP can be used.
 The protocol supports up to 32 GPIO for future products.
 Function configuration can be retrieved.
 Input or output selection can be retrieved and controlled.
 Active low or high selection can be retrieved and controlled.
 Active or inactive selection can be retrieved and controlled.
 77F0 can be disabled.
Every change of state (active/inactive) requires a command over TCP or UDP, and thus is
not very fast. If you use this port for data transfer, the throughput is low, usually up to 1 Kbps.
Control Protocol
The GPIO control protocol is a simple, proprietary protocol.

Lantronix XPort Specifications

General

Data Link Protocol	Ethernet, Fast Ethernet
Connectivity Technology	Wired
Form Factor	Embedded
Category	Embedded Systems
Interface	Serial
Serial Ports	1
Operating Temperature	0°C to 70°C