2. Communication protocol definitions
2. COMMUNICATION PROTOCOL DEFINITIONS
About
This section desc ribes the definitions used in the communications protocol. When the projectors are connected to either RS232 or
LAN you can control the pr ojectors through this ASCII based protocol.
Some commands will generate OSD f eedback. This can be stopped by turning off the OSD from the projector ’s
menu system or by setting “OSDC” t o value 0 (OS D off) or value 1 (OSD sh ow only warnings ).
Overview
•Timing
• Serial Comm unications Protocol
• Examples
2.1 Timin g
General timing constraints
Behavior Constraint
Power on (wake from standby) At least 30 seconds wait after power up complete before sending next com man d
Command Response r equired before sending next command
No respo nse received At least 2 seconds before re-sending if no response received
Between commands Minimum 500 ms delay required between commands
After sending 20 com mands Minimum 5 seconds delay r equired
2.2 Serial Commu nications Protocol
Definitions
Like every communication method the serial communication us es a par ticular protocol (ANS I) w hich must be respected in order to
allow communication to take place.
The header is ASCII c olon ’:’ c haracter.
Use of a separator is optional in the comm and protocol. The protocol accepts one ASCII SPA CE between fields, or no A SC II SPACE
between fields.
All ac knowledgement protocol use an ASCII SPACE (s ingle) as a s eparator.
The terminator is ASCII value carriage return ( CR)/hex value 0x0D.
The following table gives a summary of the predefined comm unication terms.
Header Message body Terminator
Limitations 1 byte N bytes 1 byte
Definition ASCII colon : Mnemonic Modifier Value Target Carriage Return (Hex 0 x0D)
Example
:
POWR1
CR
Header
The header informs the pr ojector (in case of transmission) or the computer (in c ase of reception) that a new data transfer will take
place.
Message body
The m essage body defines the action to be performed. The message body is built up of se veral fields:
601–0381–00 F(L)35, FS35 IR, F85 21/10/2015
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