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E L A N H O M E S Y S T E M S
© ELAN Home Systems 2009 • All rights reserved. Page 57
DT22 INSTALLATION MANUAL
Appendix B: Serial Protocol
Port Configuration
8 data bit, no parity, 1 stop bit
Baud Rates:
• 115200: Default, lower speeds will cause increased lag in unsolicited notifications.
• 57600
• 38400
• 19200
• 9600
Messages
Incoming messages must be terminated with a carriage return (13 in decimal or 0x0d in hex.)
Carriage returns will be represented as <cr> in this document.
Incoming linefeeds, 10 in decimal or 0x0D in hex, will be ignored.
All responses and unsolicited notifications will be terminated by carriage return only.
Unsolicited Feedback notifications
This is feedback that the DT22 automatically transmits whenever its state changes.
The <COMMAND> section will state if a response will be sent unsolicited or not.
Query/Response Command Structure
Query commands ask the DT22 for information.
Each main body of the command structure is seperated by a comma (44 in decimal or 0x2C in hex.)
Query
• &DT,<dd>,<COMMAND>,<SUBCOMMAND>,?<cr>
• &DT will always preceed the query
• <SUBCOMMAND> may or may not be used.
• Always end in ,?<cr> (comma, question mark, carriage return)
Response:
• *DT,<dd>,<COMMAND>,<SUBCOMMAND><cr>
• *DT will always preceed the response
• <SUBCOMMAND> may or may not be used.
• Always end in <cr> ( carriage return)