Specifications10-2610.6.2 MEWTOCOL-COM Response Format Response messageThe PLC that received the command returns the processing result.%or< 0 1 $ R C CR0① Header② Source unit number (PLC that has handled the command, decimal)③ Text (processing result / communication error code is stored)④ Check code (BCC, hexadecimal)⑤ TerminatorRead value (0: the specified contact is off)Command name (processing result of “contact area read”)Response code (“$” represents a normal processing result,while “!” indicates that an error has occurred)(10’splace)(1’splace)① Header (start code)• Commands must always have a “%” (ASCII code: H25) or a “<” (ASCII code: H3C) at thebeginning of a message.• The response must start with the same header that was at the beginning of the command.② Unit numberThe unit number. of the PLC that processed the command③TextThe content varies depending on the type of instruction. If the processing is not completedsuccessfully, an error code will be stored here, so that the content of the error can be checked.④Check code• This is a BCC (block check code) for error detection using horizontal parity.• BCC starts from the header and checks each character in sequence, using the exclusive ORoperation, and replaces the final result with character text.⑤ Terminator (end code)Messages must always end with a “CR” (ASCII code: H0D).
