85
3-4-9 No-Protocol Communications
The TXD(48) and RXD(47) instructions can be used in no-protocol mode to ex-
change data with standard serial devices. For example, data can be received
from a bar code reader or transmitted to a serial printer. The serial devices can
be connected to the RS-232C port or Peripheral port, as shown in the following
diagrams.
CPM2A CPU Unit
CPM1-CIF11
RS-232C Adapter
Peripheral port
RS-232C devices
S Bar code reader
S Serial printer
S Other serial device
CPM2A CPU Unit
RS-232C port
RS-232C devices
S Bar code reader
S Serial printer
S Other serial device
Note Set the CPU Unit’s Communications Switch to OFF to use the settings in the PC
Setup and set the communications mode to no-protocol mode for the port being
used. Refer to Section 1 PC Setup in the Programming Manual (W353) for de-
tails on settings.
3-4-10 OMRON PT Connections
In a 1:1 NT Link, a CPM2A can be connected directly to a Programmable Termi-
nal. The Programmable Terminal must be connected to the RS-232C port; it can-
not be connected to the Peripheral port.
OMRON Programmable Terminal
RS-232C Cable
(such as the OMRON
XW2Z-200T (2 m) or
XW2Z-500T (5 m))
CPM2A CPU Unit
RS-232C port
Note 1. Set the CPU Unit’s Communications Switch to OFF to use the settings in the
PC Setup and set the communications mode to a 1:1 NT Link for the
RS-232C port. Refer to Section 1 PC Setup in the Programming Manual
(W353) for details on settings.
2. When in RUN mode, if a PT is connected to the RS-232C port via Host Link,
the PT will change the PC’s operating mode from RUN mode to MONITOR
mode. For details, refer to page 85.
When the PC is in RUN mode with a Programming Console connected to the
peripheral port of the CPU Unit, if a PT is connected to the RS-232C port via Host
Automatic Mode Change
Wiring and Connections
Section 3-4
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