Zigen HX-88 - Manual (Page 38)

Matrix Switching System—User Manual
38
A-2 Device Acknowledge Type
ACC (Accept) : 1: Device accepts this request. (acknowledge)
0: Device rejects this request. (NAK; negative acknowledge)
※The device sends the Nak packet is always 2 bytes. (NAK + CRC)
0 (Reserve) : Reserve, Always 0.
CRC : Send CRC code to follow the last byte.
LB (Length) : LB value is equal to the total (Index + Value). Not include the CRC byte.
Index : Often means that the input or output port number.
Value : Response the status refers to the table.
Device ACK Type
The device returns an acknowledge packet as defined below.
Ack Type Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 ..... Last Byte
Type A ACK CRC
Type B ACK LB Index1 Value1 Index2 Value2 ..... CRC
Type C ACK LB Data1 Data2 CRC
Type D ACK LB INF OP IP Mn1 ..... CRC
Type E ACK LB EXTI VIDI AUDI PLUG ..... CRC
※ The device is always send the CRC code to follow the last byte.
Type A ACK + CRC (Total 2 Bytes)
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
ACK ACC 0 0
CRC
Device ID (0 - 31)
CRC
Type B ACK + LB + Index1 + Value1 + Index2 + Value2 + ..... + CRC
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
ACK ACC 0 0
LB
Index N
Value N
…
CRC
Length
Device ID (0 - 31)
Index
Value
……
CRC