Cable Electronics e labs SW808HD - Manual (Page 30)

Page 26 Matrix Switching System—Instruction Manual
Protocol Description
Command Packet
Command packets are sent to the Matrix Switch from a computer and are 4 or more
bytes long depending upon the instruction code.
Command Type A
Address Instruction Code Output Byte Input Byte CRC
or Command Type B
Address Instruction
Code
Length
Byte
Output
Byte 1
Input
Byte 1
= = =
Output
Byte n
Input
Byte n
CRC
Response Packet
Response or Acknowledgement (ACK) packets are returned from the Matrix Switch
after receipt of a command packet. The response packets are 2 or more bytes long
depending upon the command requirements.
ACK Type A
ACK Byte CRC
or ACK Type B
ACK
Byte
Length Byte Output
Byte 1
Input
Byte 1
= = =
Output
Byte n
Input
Byte n
CRC
or ACK Type C
ACK
Byte
Length
Byte
Information
Byte
Supported
Output
Ports
Supported
Input
Ports
Machine
Name 1
= =
Machine
Name n
CRC
Command Packet Byte Descriptions
Command Type A
Address
Instruction Code Output Byte Input Byte CRC
Command Type B
Address Instruction
Code
Length
Byte Output
Byte 1 Input
Byte 1 Output
Byte n Input
Byte n CRC