Table of Contents
Advertisement
RS-232 Protocol
This document describes the hardware interface spec and software protocols of
RS232 interface communication between ViewSonic LFD and PC or other control
units with RS232 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
RS232 protocol command.
Description
RS232 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:
Female DSUB 9-Pin
Male DSUB 9-Pin
3.5 mm barrel
connector (alternative
for limited space)
Pin # Signal
1
NC
2
RXD
3
TXD
4
NC
5
GND
6
NC
7
NC
8
NC
9
NC
Provide +5V/2A power for external
frame
GND
Item
Signal
Tip
TXD
Ring
RXD
Sleeve
GND
93 93
Remark
Input to Display
Output from Display
specific dongle *3.0
Remark
Output from Display
Input to Display
Advertisement
Table of Contents
