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VSM-4x4HFS - The VSM-4x4HFS RS-232 Communication Protocol
10.1.1.2 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)
10.1.1.3 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 '@'
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