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Expanded System Configuration Section 1-3
1:1 NT Link mode is supported for communications between only one PC and
one PT. Set the PT communications settings for a 1:1 NT Link.
Link Mode: 1:N Mode
This mode is used for communications between one PC and n (8
≥n≥1) PTs.
This mode is supported by the RS-232C port on the CPU Unit, as well as the
RS-232C port and RS-422A/485 port on the Serial Communications Board.
The 1:N NT Link mode is supported for communications between one PC and
one or more PTs. Set the PT communications settings for a 1:N NT Link.
Note The 1:1 NT Link mode and 1:N NT Link mode use different types of serial
communications and there is no data compatibility between them.
Protocol Macros The CX-Protocol is used to create sets of data transmission procedures called
protocols for general-purpose external devices according to the communica-
tions specifications of the general-purpose external devices. Communications
must be half-duplex and must use start-stop synchronization. The protocols
that have been created are recorded in a Serial Communications Board,
enabling data to be sent to and received from the external devices by simply
executing the PMCR(––) instruction in the CPU Unit. Protocols for data com-
munications with OMRON devices, such as Temperature Controllers, Intelli-
gent Signal Processors, Bar Code Readers, and Modems, are supported as
standard protocols (see note 1). These protocols can be changed to suit user
needs. Protocol macros are supported by the RS-232C port and RS-422A/
485 port on the Serial Communications Board (see note 2).
CPU Unit
RS-232C port
PT
NT Link: 1:1 Mode
Serial Communications Board
RS-232C port
PT
NT-AL001
RS-232C-to-RS-422/485
Conversion Adapter
RS-232C port
RS-422A/485
RS-422A
PT PT
Serial Communications Board
Connection to RS-232C port of
Serial Communications Board
Connection to RS-422A/485 port
of Serial Communications Board
Serial Communications Board
RS-422A/
485 port
RS-422A/485
PT PT
NT Link: 1:N Mode
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