Switching Functions Telegrams

Chapter 6: Serial Control

Special characters:

ACK 0x06

NAK 0x15

STX 0x02

ETX 0x03

CR 0x0D

ESC 0x1B

HTAB 0x09

LF 0x0A

Sequence of a Data Communication

Table 6-1. Data communication sequence.

	ServSwitch KVM DKM FX	Control CPU

	—	1. Send a command

	2. Acquire a command, process a	—
	command, block further commands.	—
	command, block further commands.

	3. a) Errors occurred: <NAK>
	b) No errors: <ACK><ECHO>	—
	c) Optional: Reply telegram with data

		4. a) Repeat telegram
	—	b) Next command
		c) Receive and process the repeat telegram

NOTE: The serial interface can be blocked while OSD is open.

Table 6-2. Input port’s request for output port.

Bytes	Description	Coding

1	Control character	0x1B

1	Server indentification	0x5B

1	Command	0x42

2	Total length of telegram (7 bytes, binary)	0x07 0x00

2	Requested output port (binary, 1…max. ports)	0x01 0x00 (for port 1) to 0x120 0x00 (for port
2	Requested output port (binary, 1…max. ports)	288)
		288)

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Black Box ACXC32, ACXC48 manual Switching Functions Telegrams, Input port’s request for output port

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Chapter 6: Serial Control