Kofloc EX-250S, Instruction Manual

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MJ400215A1
5
4. Message Structure
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Command message
The command message from the communication controller to the equipment
should be structured as shown in the following example:
STX Communication ID Command Data Check sum ETX
@ 0 0 1 W V S S 1 5 5 CR
40H 30H 30H 31H 57H 56H 53H 53H 31H 35H 35H 0DH
STX This equipment recognizes “STX” as the head of the message
unconditionally.
“@(40H)” Fixed length 1 byte
Communication ID Specify a communication ID of the equipment to which data is sent.
“001” – “099” Fixed length 3 bytes
Command Specify a character string to indicate a command type. Fixed length
4 bytes. For details, see the next section.
Data Variable length according to command types. There are commands
without data. For details, see the next section.
Check sum Added every 1 byte from STX to data and each digit of calculation
result lower 2 digits (hexadecimal) converted to ASCHII code. Fixed
length 2 bytes.
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See below.
ETX Indicates the end of the message. “CR (0DH)” Fixed length 1 byte
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An example of check sum calculation
As an example, the above command message is as follows:
40H + 30H + 30H + 31H + 57H + 56H + 53H + 53H + 31H = 255H
(STX) (Communication ID) (Command) (Data)(Check sum)