ViewSonic CDE4302 CDE4302_CDE5502_CDE4803 User Guide English - Page 35
RS232 Protocol
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11. RS232 Protocol 11.1. Introduction This document describes the hardware interface spec and software protocols of RS232 interface communication between ViewSonic Commercial TV / Digital Signage and PC or other control unit with RS232 protocol. The protocol contains three sections command: • Set-Function • Get-Function • Remote control pass-through mode ※ In the document below, "PC" represents all the control units that can send or receive the RS232 protocol command. 11.2. Description 11.2.1. Hardware specification Viewsonic TV communication port on the rear side: (1) Connector type: DSUB 9-Pin Male (2) Pin Assignment Male DSUB 9-Pin (outside view) [Special case]3.5mm barrel connector Pin # 1 2 3 4 5 6 7 8 9 frame Signal NC RXD TXD NC GND NC NC NC NC GND Remark Input to Commercial TV or DS Output from Commercial TV or DS * Use of crossover (null modem) cable required for use with PC Pin # Tip Ring Sleeve Signal TXD RXD GND Remark Output from Commercial TV or DS Input to Commercial TV or DS 11.2.2. Communication Setting - Baud Rate Select: 9600bps (fixed) - Data bits: 8 bits (fixed) - Parity: None (fixed) - Stop Bits: 1 (fixed) 11.2.3. Command Message Reference PC sends to Monitor command packet followed by "CR". Every time PC sends control command to the Monitor, the Monitor shall respond as follows: 1. If the message is received correctly it will send "+" (02Bh) followed by "CR" (00Dh) 2. If the message is received incorrectly it will send "-" (02Dh) followed by "CR" (00Dh) 26