93
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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
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
P5V/2A power for external
specific 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
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