Russound CAS44 Manual page 34

9.2 Reading Source Broadcast Display Feedback
This section describes how to read Source Broadcast Display Feedback messages. These
Feedback messages are sent to update all devices monitoring a given Source's status. These
messages may be sent as a direct result of a sent command or as a general update. The Display
Feedback message is sent with the source number of the Source attached. The attached source
number indicates which Source the update is intended. The message can be displayed for a
constant amount of time, or a "Flash" display with a specified length of time (Flash Time is in
increments of 10ms).
NOTE: It is possible that some display messages will include the special "Invert" control
character (0xF1).
NOTE: Some of the other bytes within this message may vary. Only the ones necessary to
interpret the message are highlighted.
NOTE: This message shows a text payload of 16 characters. Some devices may have a text
payload of 12 characters.
This example shows a Source Broadcast Display Feedback message with text "102.9 MHz FM".
Byte # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Value F0 7D 00 79 00 7D 00 00 02 01 01 02 01 01 00 00 01 00 14 00 10 00 00 31
Byte # 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
Value 30 32 2E 39 20 4D 48 7A 20 46 4D 00 00 00 00 00 14 F7
Byte #4 = Target Keypad ID (NOTE: A value of 0x79 in the Target Keypad ID field indicates
that this message is a Source Broadcast Display Feedback message.)
Byte #19 = Overall Payload Size
Byte #21 = Message type and Source Number = (0x10 (Source Broadcast Display Type) bit-wise
OR-ed with the source number (e.g. source 1 = 0x10, source 3 = 0x12))
Byte #22 = Flash Time low byte (Flash time is in 10ms increments, 0x00 = Constant)
Byte #23 = Flash Time high byte
Bytes #24 – #40 = Text ("102.9 MHz FM")
Byte #41 = Calculated Checksum
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