Chapter 8. Communication Functions
8-6
•
Control code
- The control codes used are as follow. Be familiar with the following control codes, because they are important for communication.
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
•
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
If it is hexadecimal, H is attached in front of the number of frames like H01, H12345, H34, H12, and H89AB
1) Sequence of command frame
(1)
Sequence of command request frame
REMARK
(PLC NAK response)
(PLC ACK response)
Station
no.
Command
Data or Null
ETX BCC
ACK
Station no. Command
Formatted data
EOT BCC
ENQ
Station
no.
Command
Data or Null
ETX BCC
NAK
Summary of Contents for GLOFA G7M-DR20U
Page 28: ...Chapter 4 Names of Parts 4 3 2 G7M DRT60U N 3 G7M DT60U N 4 G7M DT60U P...
Page 29: ...Chapter 4 Names of Parts 4 4 5 G7M DR60U DC 6 G7M DRT60U N DC 7 G7M DT60U N DC...
Page 31: ...Chapter 4 Names of Parts 4 6 3 G7M DT40U N 4 G7M DT40U P 5 G7M DR40U DC...
Page 32: ...Chapter 4 Names of Parts 4 7 6 G7M DRT40U N DC 7 G7M DT40U N DC 8 G7M DT40U P DC...
Page 33: ...Chapter 4 Names of Parts 4 8 4 1 3 30 point main unit 1 G7M DR30U 2 G7M DRT30U N 3 G7M DT30U N...
Page 34: ...Chapter 4 Names of Parts 4 9 4 G7M DT30U P 5 G7M DR30U DC 6 G7M DRT30U N DC...
Page 36: ...Chapter 4 Names of Parts 4 11 2 G7M DRT20U N 3 G7M DT20U N 4 G7M DT20U P...
Page 37: ...Chapter 4 Names of Parts 4 12 5 G7M DR20U DC 6 G7M DRT20U N DC 7 G7M DT20U N DC...
Page 38: ...Chapter 4 Names of Parts 4 13 8 G7M DT20U P DC...
Page 159: ...Chapter 7 Usage of Various Functions 7 52 c Program...
Page 183: ...Chapter 7 Usage of Various Functions 7 76 c Program...
Page 253: ...Chapter 8 Communication Functions 8 27 b When uses Ch 1 Built in RS 485...
Page 356: ...Appendix 1 System Definitions App1 9 6 Position Parameter...
Page 357: ...Appendix 1 System Definitions App1 10 7 High Speed Counter Parameter...