NAiS FP Series, User Manual

Page: 170 / 326

FP
Σ
9.1 General-purpose Serial Communication
9 - 3
9.1 General-purpose Serial Communication
This section explains about overview of general-purpose serial communication.
9.1.1 Overview of Function
What is the general-purpose serial communication?
Using the COM. ports, it sends and receives data to and from an external device such
as an image processing device or a bar code reader.
Data is read and written using the FP
Σ
ladder program, and data is read from and written
to an external device connected to the COM. port by means of the FP
Σ
data registers.
Data register (DT)
Image processing device
Sending data using the F159
(MTRN) instruction
Data is sent by transferring the data to
a data register and then sending it us-
ing the F159 (MTRN) instruction.
Data is read from and written to an external device
through the data registers.
Transmitted data
Received data
FP
Σ
Receiving data to the data register(s)
designated as the received buffer
Data is received by data being sent from
the RS232C port to the data register
specified by the system register as the
received buffer, and then being stored
there automatically.
Bar code reader
Printer
Figure 162: FP
Σ
General-purpose Serial Communication (overview)