NAiS FP Series, User Manual

Page: 137 / 326

FP
Σ
Communication Cassette
7 - 4
General-purpose serial communication
General-purpose serial communication enables data to be sent back and forth
between an image processing device connected to the COM. port and an external
device such as a bar code reader.
Reading and writing of data is done using a ladder program in the FP
Σ
, while reading
and writing of data from an external device connected to the COM. port is handled
through the FP
Σ
data registers.
Data transmission using
F159(MTRN) instruction
Data received in reception buffer
Received data
Data register (DT)
Transmitted data
Data is sent to and received
from external devices through
the data registers.
FP
Σ
Image processing device
Bar code reader
Figure 128: FP
Σ
General-purpose serial communication function
Applicable communication cassette
For 1:1 communication 1-channel RS232C type (Part No. FPG-COM1) . . . .
2-channel RS232C type (Part No. FPG-COM2)
For 1:N communication 1-channel RS485 type (Part No. FPG-COM3) . . .