Kramer VP-440 [41/59] Device message format

VP-440 - The RS-232/Ethernet (UDP) Communication Protocol

8.1.2 Device Message Format

Start

Address (optional)

Body

delimiter

Sender_id@

Message

CR LF

Device Long Response

Echoing command:

Start

Address (optional)

Body

Delimiter

Sender_id@

Command SP [Param1 ,Param2 …] result

CR LF

CR = Carriage return (ASCII 13 = 0x0D)

LF = Line feed (ASCII 10 = 0x0A)

SP = Space (ASCII 32 = 0x20)

8.1.3 Command Terms

Command

A sequence of ASCII letters ('A'-'Z', 'a'-'z' and '-').

Command and parameters must be separated by at least one space.

Parameters

A sequence of alphameric ASCII characters ('0'-'9','A'-'Z','a'-'z' and some special

characters for specific commands). Parameters are separated by commas.

Message string

Every command entered as part of a message string begins with a message

starting character and ends with a message closing character.

Note: A string can contain more than one command. Commands are separated by a

pipe ( '|' ) character.

Message starting character

'#' – For host command/query

'~' – For machine response

Device address (Optional, for K-NET)

K-NET Device ID followed by '@'

Query sign

'?' follows some commands to define a query request.