7.4.4 1:N Communication (General-purpose Serial Communication)
Overview
The FP-X and the external units are connected using an RS485 cable. Using the protocol that matches
the external units, the F159 (MTRN) instruction is used to send and receive data.
Reference: <7.2.1 Precaution When Using RS485 Port>
System register settings
• In the default settings, the COM1 port is set to computer link mode.
Settings for COM1 port
No. 412 Selection of communication mode
COM1 port
General-purpose serial communication
No. 413 Communication format for COM1port Data length: ……
Parity check: …..
Stop bit: …………
Terminator: ……..
7 bits/8 bits
None/Odd/Even
1 bit/2 bits
CR/CR+LF/None/ETX
Baud rate setting for COM1port
Note3)
No. 416 Starting address for receive buffer for
DT0 to DT32764 (Initial value: DT0)
No. 417 Receive buffer capacity
for COM1port
0 to 2048 words (Initial value: 2048 words)
Note1) The communication format and baud rate should be set to match the connected devices.
Note2) The terminal units of AFPX-COM3, AFPX-COM4 and AFPX-COM6 are specified by the dip
switch located in the communication cassette.
Note3) The baud rates of 300, 600 and 1200 bps can be specified by the SYS1 instruction. However, the
setting value of the system register cannot be changed.
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