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7 Serial Communications
NX-series Communications Interface Units User’s Manual (W540)
7-1 No-protocol Communications
7
7-1 No-protocol Communications
With no-protocol communications, data is sent and received without any conversions. Communications
protocols to perform retry processing, data type conversion processing, branch processing according to
the receive data, and other processing are not used.
You can use no-protocol communications to send data to
an
d receive data from serial communications
devices that have an RS-232C or RS-422A/485 port.
For example, you can use it for simple no-protocol data transfe
rs, such as inputting data from a barcode
reader or outputting data to a printer.
Controlling the RS and CS signals and other control signals
is also possible.
Precautions for Correct Use
Precaution on Communications State with Communications Coupler Unit
The CIF Unit must be connected to a Communications Coupler Unit and communications must
be established with the communications master to perform I/O refreshing between the commu-
nications master and CIF Unit. Send and receive
data only after confirming that communica-
tions are established between the CIF Unit and co
mmunications master. The following table
tells how to confirm that communications are established depending on the Communications
Coupler Unit. Refer to the user’s manual for the connected Communications Coupler Unit for
details.
Connected Communications Coupler Unit
Method to confirm that communications are
established
EtherCAT Coupler Unit Confirm that the state of EtherCAT
communications
between the communications master and Ether-
CAT Coupler Unit is Operational (Op).
EtherNet/IP Coupler Unit Confirm that tag data link (class 1 connection) com-
munications or socket communications are estab-
lished between the communications master and
Ethe
rNet/IP C
oupler Unit.
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