Zigen AX-88 Audio - Manual (Page 53)

Matrix Switching System—User Manual
52
Protocol Byte
Host (PC) command: 1st byte and 2nd byte are fixed.
Byte 1: Device Byte (DB)
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
DB BT 0 1 Device ID (0 - 31)
BT: Broadcast Command Flag.
0 - Instruction for Device ID only
1 - Instruction for all devices. (Device ID must be written 0)
 Devices will not respond, when receiving the broadcast command.
0: Reserve, Always 0.
1: Identifier, Always 1.
Device ID: Device id ranges from 0 to 31. (
Please refer to device’s user manual)
Byte 2: Request Byte (RB)
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RB VAR 0 Request Type (0 - 63)
VAR: Variable Length Command Flag.
0 - Standard Command (Recommended)
1 - Variable Length Command. (Only support the command Ack Type A)
Request Type: Please refer to "Table - Host Request List".
A. Standard Command
Byte 3: Index Byte (IB)
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
IB Index
Index: Please refer to "Table - Host Request List" and "Table - Command Index List".
Byte 4: Value Byte (VB)
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
VB Value
Value: Please refer to "Table - Host Request List" and "Table - Command Value List".