Mewtocol Communication; Overview Of Mewtocol-Com (Rs485) - Weidmuller Power Monitor Handbuch

Communications
9.3

MEWTOCOL Communication

9.3.1

Overview of MEWTOCOL-COM (RS485)

Command and response functions
The computer sends commands (instructions) to Power Monitor, and receives responses in return. This
enables the computer and Power Monitor to converse with each other, so that various kinds of information
can be obtained and provided.
Command and response formats
(Host computer) Header
(Power Monitor)
• Control codes
Name Character
Header
Command
Normal
response
Error response
Terminator
• Destination and source AD (H), (L)
◊ Two-digit decimal 01 to 99 (ASCII codes)
◊ Command messages contain a station number for Power Monitor that receives the message.
◊ When FF (ASCII code table) is used, however, the transmission is a global transmission (sent to all
stations at once).
Note
1) When a global transmission is sent, no response to the command message is returned.
1435710000/01/05.13
Computer
Command message
Des-
Text
tination
ASCII code
% 25H
# 23H
$ 24H
! 21H
CR 0DH
①
Commands
Power Monitor
②
Responses
Check Termi-
code nator
Header Source
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.
(To next command)
Check
Text
code
Normal response message
Explanation
Termi-
nator
65