JRC Alphatron SSRS, Installation And Operation Manual

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2.2.1.3 HBT Sentence
The Alphatron SSRS sends a heartbeat (HBT) sentence once every 60 seconds. This sentence is sent to the MISC
transmission group. It is equal to the standard HBT sentence, except that it is sent as a parameter to the PJTR sentence.
Note Refer to IEC 61162-1 standard for more information regarding heartbeat sentence.
Figure 19: Example, HBT sentence
2.2.2 DDC Sentence
The Alphatron SSRS display unit listens for display dimming control (DDC) sentences sent from any other unit on the
network, that sends on the MISC channel, or uses the same transmission group as configured in the web interface
network settings.
When a DDC sentence is received, the display device will adjust the brightness to the new level received.
Two variants of the DDC messages are supported; one with and one without the sentence status parameter at the end of
the sentence.
Note Refer to IEC 61162-1 standard for more information regarding the two variants and the DDC sentence.
Figure 20: Example, DCC sentence
Note The two dashes before the DDC message represents the sender and can be any two upper case
characters from A-Z.
19 | Operation