VIEWSONIC 55" 4K Wireless Presentation Display Bundle with Wall Mount - Manual (Page 61)

61
RS-232 Protocol
This document describes the hardware interface spec and software protocols of the
RS-232 interface communication between ViewSonic LFD and a 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 (female or 3.5 mm barrel connector)
2. Use of crossover (null modem) cable for connection
3. Pin Assignment:
Male DSUB 9-Pin
(preferred)
Female DSUB 9-Pin
Pin # Signal Remark
1 NC
2 RXD Input to Display
3 TXD Output from Display
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
frame GND
3.5 mm barrel
connector (alternative
for limited space)
Item Signal Remark
Tip TXD Output from Display
Ring RXD Input to Display
Sleeve GND