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Matrix Switching System—User Manual

Appendix A RS-232 Communication Protocol

This AV Matrix RS-232 communication protocol uses fixed length with 5 bytes of

information as define below. The default baud rate is 9600 bps, no parity, 8 data bit and

1 stop bit. Command timeout is 300ms, and byte to byte timeout is 30ms.

Use the RS-232 connecting cable to connect the computer serial port to the RS-232

communication port of the Matrix device. The computer can control the Matrix device via

RS-232. Aside from using the front panel keys for operation, you are also permitted to

use the RS-232 connection port for remote operation.

A-1 Host Request

A standard command is 5 bytes:

Device + Request + Index + Value + CRC

Byte 1: Device Byte (DB)

Byte 2: Request Byte (RB)

Byte 3: Index Byte (IB)

Byte 4: Value Byte (VB)

Byte 5: CRC Byte (CB)

 Host must send CRC code to follow the last byte.

A-1.1 Device Byte

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

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 response, 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)

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 37 38

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Zigen HX-44 Manual de usuario Pagina 26