ARTHUR HOLM AHDTL User Manual - Page 9

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AHNET PROTOCOL
AHnet protocol
Using 5 bytes communication:
BYTE 0
START BYTE
BYTE 1
ADDRESS BYTE
BYTE 2
COMMAND BYTE
BYTE 3
VALUE 1
BYTE 4
VALUE 2
AHnet commands
COMMAND
DESCRIPTION
FA XX 01 01 00
GO UP
FA XX 01 00 00
GO DOWN
FA XX 02 01 00
MUTE ON (Only on PA mode)
FA XX 02 00 00
MUTE OFF (Only on PA mode)
FA XX 04 00 00
BUTTON LOCKED
FA XX 04 01 00
BUTTON UNLOCKED
FA XX 14 00 00
INQUIRY CONTROL BYTE
XX
Number of the DynamicTalk address.
Up to 30 units for each RS422 BUS
CB1
Response in 8 bits of the device status
CB2
Not implemented
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RESPONSE
FB XX 01 01 00
FB XX 01 00 00
FB XX 02 01 00
FB XX 02 00 00
FB XX 04 00 00
FB XX 04 01 00
FB XX 14 CB1 CB2
AHNET PROTOCOL
CB1
BIT 0
TOP POSITION
BIT 1
DOWN POSITION
BIT 2
MUTE ON (1)
BIT 3
BUTTON LOCKED (1)
BIT 4
BIT 5
BIT 6
BIT 7
(1) FAILURE IN THE SYSTEM
To send an order to all the devices, you must use the address:
F7 Hex. (Byte1)
In this case, the units will not respond.
Use shielded (FTP) RJ45 cables for RS422 BUS.
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