Barco FL35, Command Reference Manual

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2. Communication protocol definitions
2. COMMUNICATION PROTOCOL DEFINITIONS
About
This section describes the de fi nitions used in the communications protocol. When the projectors are connected to either RS232 or
LAN you can control the projectors through this ASCII based protocol.
Some commands will generate OSD feedback. This can be stopped by turning off the OSD from the projector’s
menu system or by setting “OSDC” to value 0 (OSD off) or value 1 (OSD show only warnings).
Overview
• Timing
• Serial Communications Protocol
• Examples
2.1 Timing
General timing constraints
Behavior Constraint
Power on (wake from standby) At least 30 seconds wait after power up complete before sending next command
Command Response required before sending next command
No response received At least 2 seconds before re-sending if no response received
Between commands Minimum 500 ms delay required between commands
After sending 20 commands Minimum 5 seconds delay required
2.2 Serial Communications Protocol
De fi nitions
Like every communication method the serial communication uses a particular protocol (ANSI) which must be respected in order to
allow communication to take place.
The header is ASCII colon ’:’ character.
Use of a separator is optional in the command protocol. The protocol accepts one ASCII SPACE between fi elds, or no ASCII SPACE
between fi elds.
All acknowledgement protocol use an ASCII SPACE (single) as a separator.
The terminator is ASCII value carriage return (CR)/hex value 0x0D.
The following table gives a summary of the prede fi ned communication terms.
Header Message body Terminator
Limitations 1 byte N bytes 1 byte
De fi nition ASCII colon
:
Mnemonic Modi fi er Value Target Carriage Return (Hex 0x0D)
Example
:
POWR1
CR
Header
The header informs the projector (in case of transmission) or the computer (in case of reception) that a new data transfer will take
place.
Message body
The message body de fi nes the action to be performed. The message body is built up of several fi elds:
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