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

LAN Hardware Specification

ViewSonic LFD communication port on the rear side:

1. Connector type: 8P8C RJ45
2. Pin assignment:

	Pin #	Signal	Remark
	1	TX+	Output from Display
	2	TX-	Output from Display
	3	RX+	Input to Display
	4	BI_D3+	For 1G case
	5	BI_D3-	For 1G case
	6	RX-	Input to Display
	7	BI_D4+	For 1G case
	8	BI_D4-	For 1G case
	frame	GND

RS-232 Communication Setting

• Baud Rate Select: 9600bps (fixed)
• Data bits: 8 bits (fixed)
• Parity: None (fixed)
• Stop Bits: 1(fixed)

LAN Communication Setting

• Type: Ethernet
• Protocol: TCP/IP
• Port: 5000 (fixed)
• Cross subnet: No
• Logon Credentials: No

Command Message Reference
PC sends to LFD command packet followed by “CR”. Every time PC sends control command to Display, the Display shall respond as follows:

1. If the message is received correctly it will send “+” (02Bh) followed by “CR” (00Dh)
2. If the message is received incorrectly it will send “-” (02Dh) followed by “CR” (00Dh)