Rs-232 Protocol; Description; Rs-232 Hardware Specification - ViewSonic VS19315 User Manual

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:
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
Provide +5V/2A power for external
9 NC
frame GND
Item Signal
Tip TXD
Ring RXD
Sleeve GND
125
Remark
Input to Display
Output from Display
specific dongle *3.0
Remark
Output from Display
Input to Display