Omron SYSMAC NX-CIF Series User Manual page 113

CPU Unit or communications master
Step Process
7 Second • The communications master outputs
input the following output notification data.
response
• The communications master sets the
Input SID Response to the value of
the Input SID (02 hex) to tell the CIF
Unit that the communications master
has normally received the second
input data.
Output SID
Input SID
Response
Output Data
Type
Output Sub Info
Output Data
Length
Output Data
8 Comple- • The communications master
tion of receives the input notification data
data input given on the right.
• The communications master checks
the Input SID.
• The Input SID is still 02 hex, so the
master knows that there is no new
input data included in the input notifi-
cation data that was received.
*1. Output notification data is output from the CPU Unit or communications master to the CIF Unit.
: Input notification data is input from the CIF Unit to the CPU Unit or communications master.
NX-series Communications Interface Units User's Manual (W540)
processing
-
02 hex
-
-
-
-
7 Serial Communications
Communi-
cations
CIF Unit processing
*1
direction
• The CIF Unit receives the output notifica-
tion data given on the left.
• The CIF Unit knows that the CPU Unit or
communications master has normally
received the second input data because
the Input SID Response in the output noti-
fication data is 02 hex.

• The CIF Unit inputs the following input
notification data.
• The CIF Unit leaves the Input SID set to
02 hex to tell the CPU Unit or communica-
tions master that no input data is included
in the input notification data.

Port Status
Input SID
Output SID
Response
Input Data Type
Input Sub Info
Input Data Length
Input Data
-
02 hex
-
-
-
-
None
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7