Chapter8 Communication Function
8-6
Remark
1) The numerical data of all frames are ASCII codes equal to hexadecimal value, if there’ s no clear
statement. The terms in hexadecimal are as follows.
•
Station No.
•
When the main command is R(r) or W (w) and the command type is numerical (means a data type)
•
All of the terms indicating size of all data in the Formatted data area.
•
Monitoring registration and command registration number of execution commands.
•
All contents of data
Remark
1) If it is hexadecimal, H is attached in front of the number of frames like H01, H12345, H34, H12, and H89AB.
2) Sequence of command frame
(1)
Sequence of command request frame
ENQ
Station No.
Command
Fomatted data
EOT
BCC
(PLC ACK response)
ACK Station No.
Command
Data or null
ETX BCC
NAK Station No.
Command
Error code
ETX BCC
(PLC NAK response)
