Kramer-electronics VP-27 User Manual download pdf (Page 24)

Kramer Protocol

# Address@ Command_1 Parameter1_1,Parameter1_2,… |Command_2

Parameter2_1,Parameter2_2,… |Command_3

Parameter3_1,Parameter3_2,… |…CR

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

[

param1 ,param2

…]

result

CR = Carriage return (ASCII 13 = 0x0D)

LF = Line feed (ASCII 10 = 0x0A)

SP = Space (ASCII 32 = 0x20)

13.3.2 Command Parts Details

Command:

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

Command will separate from parameters with at least single space.

Parameters:

Sequence of Alfa-Numeric ASCII chars ('0'-'9','A'-'Z','a'-'z' and some special chars for specific commands), parameters will be

separated by commas.

Message string:

Every command must to be entered as part of message string that begin with message starting char and end with message

closing char, note that string can contain more then one command separated by pipe ("|") char.

Message starting char:

'#' for host command\query.

'~' for machine response.

Device address (Optional, for Knet):

Knet Device ID follow by '@' char.

Query sign = '?', will follow after some commands to define query request.

Message closing char =

Host messages - Carriage Return (ASCII 13), will be referred to by CR in this document.

Machine messages - Carriage Return (ASCII 13) + Line-Feed (ASCII 10), will be referred to by CRLF.

Spaces between parameters or command parts will be ignored.

Commands chain separator char:

When message string contains more than one command, commands will be separated by pipe ("|").

Commands entering:

If terminal software used to connect over serial \ ethernet \ USB port, that possible to directly enter all commands characters

(CR will be entered by Enter key, that key send also LF, but this char will be ignored by commands parser).

Sending commands from some controllers (like Crestron) require coding some characters in special form (like \X##).

Anyway, there is a way to enter all ASCII characters, so it is possible to send all commands also from controller.

(Similar way can use for URL \ Telnet support that maybe will be added in future).

Commands forms:

Some commands have short name syntax beside the full name to allow faster typing, response is always in long syntax.

Commands chaining:

It is possible to enter multiple commands in same string by '|' char (pipe).

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Kramer-electronics VP-27 User Manual Page 24

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