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MatrixPRO • 16x16 and 8x8 HD/SD-SDI Router • User’s Guide 63

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RS-485 Mode

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To switch to RS-485, refer to the “RS-232 Settings Menu” section in Chapter3. Single

commands will be combined with a command delimiter start, device number, command

separator and command delimiter end to form a command string as shown below:

•Single Command Format:

•Multiple Command Format:

SExample:

The command string is started by the command delimiter start character “*”. The first

command follows directly after the command delimiter start character. The example shows

that device 12 should process the XYZ command with A and 9 as parameters. A comma

(ASCII 44) separates the commands. Device 9 will process the PDQY command with a

parameter of 1234 and device 31 will process the WX command with parameters of 200

and 98. The command end delimiter character “!” follows directly after the last command to

end the command string.

Commands received in the command string will not be processed until the command end

delimiter character “!” is received. This format allows commands to be stacked up for

transmission to a single device or multiple devices and executed when the cde “!” character

is received by all units. Any incomplete or unknown commands will be ignored. The

maximum number of commands that can be stacked up per unit is 16. Each unit will only

stack those commands assigned to it, even though all units receive the same command

string.

During queue processing, no input buffer processing is performed. Characters sent

through the serial port during queue processing are still stored in the input buffer. If

hardware flow control is not observed, it is important to guarantee that the input buffer limit

Table B-3. RS-485 Command Syntax

Command Description

cds cds is the command delimiter start character '*' (ASCII 42).

id id is the device number in the range of 1 to 32. This can be a single

character for values less than 10, no preceding zero is required.

cmd cmd is any valid Graphics Board command, typically 2 to 6

characters in length

arg arg1,2,N is any required or optional parameters need for the

command

, separates multiple commands

cde cde is the command delimiter end character '!' (ASCII 33).