FPΣ User's Manual 
 
8.3 Communication Specifications 
163 
8.3 Communication Specifications 
Overview of communication modes, interfaces, and communication cassettes 
MEWTOCOL-COM 
Master/Slave
1)
 
Program controlled
1)
 
Modbus RTU 
Master/Slave
1)
 
Communication 
Mode 
1:1  1:N  1:1  1:N 
PLC 
Link
2)
 
1:1  1:N 
Interface  RS232C RS485  RS232C RS485 
RS232C 
RS485 
RS232C RS485 
Device 
FPG- 
COM1 
COM2 
COM4 
FPG- 
COM3 
COM4 
FPG- 
COM1 
COM2 
COM4 
FPG- 
COM3 
COM4 
FPG- 
COM1 
COM2 
COM3 
COM4 
FPG- 
COM1 
COM2 
COM4 
FPG- 
COM3 
COM4
 
Communication 
method 
Half-
duplex 
2-wire, 
half-
duplex 
Half-
duplex 
2-wire, half-
duplex 
Token bus 
(floating 
master) 
Half-
duplex 
2-wire, 
half-duplex 
 
1)
 
Although the communication cassette has adequate noise protection, the user program should execute a 
retransmission when a communication error occurs. This improves reliability of the communication when 
communication errors due to excessive noise occur or when the receiver equipment cannot receive 
temporarily. 
2)
 
For RS232C connections, the maximum number of stations is 2. 
Communication specifications 
Interface   RS232C (non-isolated)  RS485 (isolated) 
1)
 
2)
 
Communication mode 
1:1 1:N 
Communication method 
Half-duplex 2-wire, half-duplex 
Synchronous method 
Start stop synchronous system 
Transmission line 
Multicore shielded line  Shielded twisted-pair cable or VCTF 
Transmission distance 
15m 
≤1200m 
Baud rate 
3)
 
8)
 
9)
 
2400, 4800, 9600, 19200, 38400, 57600, 115200bit/s 
MEWTOCOL-COM 
ASCII, JIS7, JIS8 
Program controlled 
ASCII, JIS7, JIS8, Binary 
Transmissi
on code 
Modbus RTU 
Binary 
Communication format (set in 
system registers) 
4)
 
Data length:  7 bits/8 bits 
Parity:   None/Odd/Even 
Stop bit:    1 bit/2 bits 
End code:  CR/CR+LF/None/ETX 
Start code:  No STX/STX 
No. of connected stations 
5)
 
6) 7)
 
2 
≤99 (≤32 with C-NET adapter) 
 
1)
 
The number of stations, transmission distance, and baud rate may vary depending on the connected RS485 
device.