Matrix Switching System
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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.