Zigen HX-88 - Manual (Page 35)

Matrix Switching System—User Manual
35
A-1 Host Request Table
This RS-232 / RS-485 communication protocol uses five bytes of information as defined below.
BT : 0: Instruction for device ID only.
(Broadcast) 1: Instruction for all devices. (Device ID must be written 0)
※Devices will not response, when receiving the broadcast request.
0 (Reserve) : Reserve, Always 0.
1 (Identifier) : Identifier, Always 1.
Device ID : Device id ranges from 0 to 31.
VAR : 0: Normal length command. (Recommended)
(variable) 1: Variable length command. (Only support the command is Ack
Type A)
If the VAR (variable) is 1, please refer to the table below.
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.
The default maximum length is 128. (If the extended information does
not exist.)
※The default baud rate is 9600, with no parity, 8 data bits and 1 stop bit.
Host Target + Request + Index + Value + CRC
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Target BT 0 1
Request VAR 0
Index
Value
CRC CRC
Device ID (0 - 31)
Index
Value
Request (0 - 63)
Variable Target + Request + LB + Index1 + Value1 + Index2 + Value2 + ..... + CRC
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Target BT 0 1
Request VAR 0
LB
Index 1
Value 1
…
Index n
Value n
CRC
Value n
Index n
Device ID (0 - 31)
Request (0 - 63)
Index 1
Value 1
CRC
Length
……