EDO - External Data Output
From Zenitel Wiki
EDO (External Data Output) is an user definable, output-only, ASCII HEX protocol intended for CCTV control etc.
EDO is controlled from the Event Handler where it can be configured to send free text merged with parameters for the active stations.
Syntax
EDO "free text" This will send free text out on the EDO port
Example
EDO 2 "Door A2 open \x0D\x0A" Output: Door A2 open +CR+LF