HDC-UHD Series Command Guide
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2.3 Unsolicited status notification
The HDC can notify status changes and problems in a system through RS-232C or LAN communication.
Unsolicited status notification:
(1) The unsolicited status notification feature is enabled using @SPH command.
(2) The control device periodically sends @GIV command (30 seconds or shorter) to keep the connection.
This step can be skipped for RS0232C communication.
(3) The HDC notifies control device of changes in HDC.
(4) The control device sends @AIN command that is for getting input status.
(5) The HDC sends the control device current status.
HDC-TR121UHD
PC
(Control device)
(2)
(3)
(4)
(5)
(1)
[Fig. 2.7] Notifying status
Interval between a notification and the next notification
If no change is detected during the interval, status is sent immediately after detecting a change.
500 ms
Status change (HDC)
Notification time
Status notification
(HDC to Control device)
500 ms
500 ms
500 ms
[Fig. 2.8] Notification interval
Notes:
・
You need to set the time again after powering off the HDC.
・
If “
@G&S / @S&S RS-232C transmission mode
” is set to “1” (transmission mode), this feature cannot be
used.
