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5

Serial Communication

Control Port (RS-232)

The MH4-HD can send and receive serial commands via RS-232. The the port  

may be set for Null or Straight using the switch located beside the RS-232 port.  

The port is a modular RJ-45 jack; adapter cables are available for 3.5mm or DB-9 

serial ports. 

Control Bus (RS-485)

The RS-485 control bus allows the MH4-HD to interact with devices such as the 

Audio Authority TouchSelect panels or the 1895 Visual Volume knob. The MH4-HD 

can also control switch modules or amplifiers that are linked via the Control Bus.

The MH4-HD is unit ID 0, all on-board push-button positions respond to commands 

addressed to ID 0. All commands are echoed on the RS-232 control port and  

RS-485 control bus, regardless of ID.

External Settings (RS-232)

Baud rate may be changed via BrightAuthor.

Default Baud Rate

115200

Data Bits

8

Parity

None

Stop Bits

1

Changing the Baud Rate (RS-232)

In BrightAuthor, select the proper Baud rate to communicate to external serial 

devices. The MH4-HD is always ID 0.

STRUCTURE

EXAMPLE

RESULT

[BAUD#_#]

[BAUD0_9600]

MH4-HD ID 0 BAUD RATE SET TO 9600

[BAUD#_#]

[BAUD0_115200]

MH4-HD ID 0 BAUD RATE SET TO 115200

[BAUD#_#]

[BAUD0_19200]

MH4-HD ID 0 BAUD RATE SET TO 19200

[BAUD#_#]

[BAUD0_57600]

MH4-HD ID 0 BAUD RATE SET TO 57600

[BAUD#_#]

[BAUD0_38400]

MH4-HD ID 0 BAUD RATE SET TO 38400

Internal Settings

Port

0

Baud Rate

115200

Data Bits

8

Parity

None

Stop Bits

1

Protocol

ASCII

Send EOL

CR

Receive EOL

CR

Control Bus Settings (RS-485)

Baud Rate

57600

Protocol

Control Bus (RS485)

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