LS Industrial Systems MASTER-K80S, Руководство пользователя

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Chapter8 Communication Function
8-5
8.1.3 Frame Structure
1) Base Format
(1) Request frame(external communication device
→
MK80S base unit)
(Max. 256 Bytes)
Header
(ENQ)
Station
number
Command
Command
type
Structurized data area
Tail
(EOT)
Frame check
(BCC)
(2) ACK Response frame (MK80S base unit
→
external communication device, when receiving data
normally)
(max. 256 Bytes)
Header
(ACK)
Station
number
Command
Command
type
Structurized data area or null code
Tail
(ETX)
Frame check
(BCC)
(3) NAK Response frame (MK80S base unit
→
external communication device, when receiving data
abnormally)
(max. 256 Bytes)
Header
(NAK)
Station Command
Command
type
Error code (ASCII 4 Byte)
Tail
(ETX)
Frame check
(BCC)
Remark
1) Used control codes are as follows. Be familiar with the following control codes. Because they are importantly
used for communication.
[Control codes]
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