IFP50-3 RS-232 Protocols

RS-232 Protocol

This document describes the hardware interface spec and software protocols of RS-232 interface communication between ViewSonic LFD and PC or other control units with RS-232 protocol.

The protocol contains three command sections:

• Set-Function
• Get-Function
• Remote control pass-through mode

NOTE: Below, “PC” represents all the control units that can send or receive the RS-232 protocol command.

Description

RS-232 Hardware Specification
ViewSonic LFD communication port on the rear side:

1. Connector type: DSUB 9-Pin Male (or 3.5 mm barrel connector)
2. Use of crossover (null modem) cable for connection
3. Pin Assignment:

	Pin #	Signal	Remark
Female DSUB 9-Pin	1	NC
	2	RXD	Input to Display
	3	TXD	Output to Display
	4	NC
	5	GND
Male DSUB 9-Pin	6	NC
	7	NC
	8	NC
	9	NC	Provide +5V/2A power for external specific dongle *3.0
	frame	GND

	Item	Signal	Remark
3.5 mm barrel connector (alternative for limited space)	Tip	TXD	Output to Display
	Ring	RXD	Input to Display
	Sleeve	GND