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Serial Communications Section 6-3
6-3-2 No-protocol Communications
No-protocol communications enable sending and receiving data using the
TRANSMIT (TXD(236)) and RECEIVE (RXD(235)) instructions without using
a protocol and without data conversion (e.g., no retry processing, data type
conversion, or process branching based on received data). The communica-
tions mode for the serial port must be set for no-protocol communications in
the PLC Setup.
No-protocol communications are used to send data in one direction to or from
standard devices that have an RS-232C or RS-422A/485 port using TXD(236)
or RXD(235).
Peripheral
bus (toolbus)
CX-Programmer Provides high-speed communi-
cations with the CX-Program-
mer.
(Remote programming through
modems is not supported.)
OK OK
1:1 NT Links OMRON PTs (Programmable Terminals) Enables data exchange with a
PT without communications
programming in the CPU Unit.
(The 1:N NT Link protocol is
used for communications even
for 1:1 connections.)
OK OK
1:1 Links Enables linking data in a 64-
word Link Area between two
PLCs connected by an RS-
232C cable.
OK OK
Protocol Connected devices Description Serial
port 1
Serial
port 2
Personal computer running
the CX-Programmer
RS-232C
Peripheral bus (toolbus)
NS-series PT
RS-232C
NT L
ink
1:1 Link
CP1L CPU Unit
C-series CPU Unit
CPM1A-V1
CPM2@
CQM1H
C200HX/HG/HE
RS-232C
CP1L CPU Unit
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