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7.5.4 1:N Communication (General-purpose Serial Communication)
Overview
The FPΣ 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.
When data has been sent from FPΣ via the RS485 communication of AFPG806, start sending data to
FPΣ side after the time mentioned below passed at the receiver.
In case of 19200 bit/s: 1 ms In case of 115200 bit/s: 200µs
Reference: <7.2.1 Precaution When Using RS485 Port>
System register settings
• In the default settings, the COM port is set to computer link mode.
Settings for COM1 port
No. Name Set Value
No. 412 COM1 port selection of
communication mode
General-purpose serial communication
No. 413 Communication format for COM1
port
Data length: ……
Parity check: …..
Stop bit: …………
Terminator: ……..
Header: …………
7 bits/8 bits
None/Odd/Even
1 bit/2 bits
CR/CR+LF/None/ETX
No STX/STX
No. 415 Baud rate setting for COM1 port 2400 to 115200 bps
No. 416 Starting address for receive buffer
for COM1 port
DT0 to DT32764 (Initial value: DT0)
No. 417 Receive buffer capacity
for COM1 port
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 RS485 port of the AFPG806 is either 19200 bps or 115200 bps only.
Also the baud rate (communication speed) must be identically set by the system register and the
dip switch in the communication cassette.
Reference: <7.1.4 Setting of AFPG806 Switch>
Note3) Connect the “−“ terminal and the “E” terminal with a lead wire to make the termination resistance
of the AFPG803 effective.
The termination resistance of the AFPG806 is specified by the dip switch located in the
communication cassette.
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