This is the station no. of the PLC that processed the command.
(3) Frame No.
This is the frame number where the command was processed.
(4) Text
The content of this varies depending on the type of command. If the processing is not
completed successfully, an error code will be stored here, so that the content of the error can be
checked.
(5) Check code
● This is a CRC (Cyclic Redundancy Check) to detect errors using a generating polynomial of
hamming codes.
● This should be created so that it targets all of the text data from the header to the last text
character.
● CRC is text information that is converted from the results of calculations made by CRC-16-
CCITT. Normally, CRC is automatically generated by incorporating calculation programs or
other similar programs.
(6) Terminator (end code)
The message should end with "CR" (ASCII code: H0D).
● If no response is returned, the communication format may not be correct, or the command may
not have arrived at the PLC, or the PLC may not be functioning. Check to make sure all of the
communication specifications (e.g. baud rate, data length, and parity) match between the
computer and the PLC.
● If the response contains an “!” instead of a “$”, the command was not processed successfully.
The response will contain a communication error code. Check the meaning of the error code.
● Station no. and command name are always identical in a command and its corresponding
response (see below). This makes the correspondence between a command and a response
clear.
11.3 MEWTOCOL7-COM Format
WUME-FP7COM-07 11-9
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