4. Check code
BCC (block check code) for error detection using horizontal parity. The BCC starts from the header and
checks each character in sequence, using the exclusive OR operation, and replaces the final result with
character text.
5. Terminator (end code)
There is always a “
CR
” (ASCII code: H0D) at the end of the message.
Note: When reading
•
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.
•
Unit number 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.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
Summary of Contents for AFPX-C30R
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