Panasonic FP0R User Manual page 247

Appendix
COM port (RS485)
Item
Interface
Connection mode
Transmission distance
Baud rate
Communication method
Synchronous method
Transmission line
Transmission code
Communication format (set in system registers)
No. of connected stations
Communication mode
1)
The number of stations, transmission distance, and baud rate may vary depending on the connected RS485
device.
2)
The values for the transmission distance, baud rate and number of stations should be within the values noted in
the following graph.
y
99
40
0
3)
Set the baud rate in the system registers and set the DIP switch on the bottom of the unit to the same setting.
When a C-NET adapter is connected to the RS485 interface, you can only specify a baud rate of 19200bit/s.
4)
The start and end code can only be used in program controlled communication.
5)
Station numbers should be registered via the system registers.
NOTE
If the potential difference between the power supplies of RS485 devices
exceeds 4V, communication may fail because the RS485 port is non-isolated.
The large potential difference will damage the connected devices.
246
MEWTOCOL-COM
Program controlled
Modbus RTU
4)
2) 5)
700 1200
Description
RS485
1:N
1)2)
1200m
2)3)
19200, 115200bit/s
2-wire, half-duplex
Start stop synchronous system
Shielded twisted-pair cable or VCTF
ASCII
ASCII, Binary
Binary
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
99 (32 with C-NET adapter)
MEWTOCOL-COM Master/Slave
Modem initialization
Program controlled
Modbus RTU Master/Slave
PLC Link
x
Transmission distance [m]
y
Number of stations
For a baud rate of 115200bit/s
1
For a baud rate of 19200bit/s
2
x