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RS-232 Protocol
This document describes the hardware interface spec and soware protocols of the
RS-232 interface communicaon between ViewSonic LFD and a PC or other control
units with RS-232 protocol.
The protocol contains three command secons:
• Set-Funcon
• Get-Funcon
• Remote control pass-through mode
NOTE: Below, “PC” represents all the control units that can send or receive the
RS-232 protocol command.
Descripon
RS-232 Hardware Specicaon
ViewSonic LFD communicaon 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 connecon
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
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