Fins Command And Response Frames; Fins Command Frame Configuration; Fins Response Frame Configuration - Omron CJ - REFERENCE MANUAL 07-2009 Reference Manual

FINS Command and Response Frames

Command Frame
Host Link header
Response Frame
Host Link header
3-3 FINS Command and Response Frames
3-3-1

FINS Command Frame Configuration

FINS header (automatically attached for CMND(490))
*With Host Link communications, the header, FCS, and terminator are attached before and after the frame.
3-3-2

FINS Response Frame Configuration

FINS header (deleted automatically for CMND(490))
*With Host Link communications, the header, FCS, and terminator are added before and after the frame.
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FINS command frame (See note.)
Note A FINS command frame also consists of the destination node address, the
source node address, and other FINS command format data.
The CS/CJ/CP-series CPU Unit or NSJ Controller that receives the command
will return the following response frame to the host computer.
FINS response frame (See note.)
Note A FINS response frame also consists of the contents set (e.g., requested) at
the time of transmission and the FINS command response format data.
It is also possible to send a FINS command frame with a Host Link header
and terminator from a CS/CJ/CP-series (not possible from a CP1E CPU unit)
CPU Unit or NSJ Controller to a host computer connected by Host Link Sys-
tem (unsolicited communications initiated by a slave).
If the data from the command code onwards is set in the words specified with
S when a FINS command is sent by means of CMND(490), a FINS header will
be generated automatically and attached, and the FINS command frame will
be sent. When the FINS response frame is received, the FINS header will be
automatically removed and the response data from the command code
onwards will be stored as specified in the words specified with operand D.
When a FINS command is sent by Host Link communications, the header is
attached before the FINS frame, and the FCS and terminator are attached
after it.
Host Link
FCS
Host Link
FCS
Command
Text
code
*Set in word specified for CMND(490) operand S onwards.
End
Command
Text
code
code
*Set in word specified for CMND(490) operand D onwards.
Section 3-3
Host Link terminator
Host Link terminator