Panasonic FP2 ET-LAN Technical Manual page 231

Note:
With MEWTOCOL communication through an ET-LAN unit, a format is used in which the special
-
header shown below is added to MEWTOCOL-COM commands and responses.
Special header for ET-
LAN unit
The content of the special header changes depending on the communication conditions.
-
Control codes
Name
Header
Command
Normal
response
Error response
Terminator
Delimiter
Destination and source AD (H), (L)
Two-digit decimal 01 to 64 (ASCII codes)
Command messages contain a unit number for the programmable controller that receives the message.
Response messages contain the unit number of the programmable controller that is sending the
response.
(H) indicates the upper digit and (L) the lower digit. If there is no particular value to be specified, "01"
should be set.
When FF (ASCII code table) is used, however, the transmission is a global transmission (sent to all units
at once).
Note) When a global transmission is sent, no response to the command message is returned.
Block check code BCC (H), (L)
Two-digit hexadecimal 00 to FF (ASCII codes)
These are codes (horizontal parity) that are used to detect errors in the transmitted data. If "**" is entered
instead of "BCC", however, messages can be transmitted without the BCC. In this case, the BCC is
included with the response.
Error code Err (H), (L)
Two-digit hexadecimal 00 to FF (ASCII codes)
These indicate the contents if an error occurs.
Character ASCII code
% or < 25H or 3CH
# 23H
$ 24H
! 21H
CR 0DH
&(+ CR) 26H
MEWTOCOL
command/response
Explanation
Indicates the beginning of a message.
Indicates that the data comprises a command
message.
Indicates that the data comprises a normal
response message.
Indicates that the data comprises a response
message when an error occurs.
Indicates the end of a message.
Indicates a delimiter that splits data into multiple
frames.
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