101101
RS-232 Protocol
This document describes the hardware interface spec and soware protocols of RS-
232 interface communicaon between ViewSonic LFD and 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 (or 3.5 mm barrel connector)
2. Use of crossover (null modem) cable for connecon
3. Pin Assignment:
Female DSUB 9-Pin
Male 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
Provide +5V/2A power for external
specic dongle *3.0
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
To Next Page
Loading...
Need help?
General