LSIS XBE-DC08A, Руководство пользователя, Страница: 1048 / 1284

Chapter 2 Built-in Cnet communication
2-50
B
u
ilt
-in
C
omm
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
2) If it is hexadecimal, H is attached in front of the number of frames like H01, H12345, H34, H12, and H89AB.
3) Available frame length is maximum 256 bytes.
4) Used control codes are as follows.
5) If the command is small letter (r), BCC value is added in check frame. The other side capital letter (R), BCC value is not
added in check frame.
(2) Command frame sequence
a) Sequence of command request frame
ENQ
Station
No.
Comman
d
Formatted data
EOT BCC
ACK
Station
No.
Command Formatted data
ETX BCC
NAK
Station
No.
Command Formatted data
ETX BCC
Codes Hex value Name Contents
ENQ H05 Enquire Request frame initial code
ACK H06 Acknowledge
ACK response frame initial code
NAK H15 Not Acknowledge NAK response frame initial code
EOT H04 End of Text Request frame ending ASCII code
ETX H03 End Text Response frame ending ASCII code
Note
(PLC ACK response)
(PLC NAK response)