Panasonic FPS Series, User Manual

Page: 181 / 332

Communication
FP Σ User's Manual
164
2)
The values for the transmission distance, baud rate and number of stations should be within the values noted
in the following graph.
x transmission distance [m]
y number of stations
1
for a baud rate of 115200bit/s
2
for a baud rate of 57600bit/s
99
1200 1000 700 0
40
70
x
y
When using a baud rate of 2400bit/s to 38400bit/s, a maximum of 99 stations and a maximum transmission
distance of 1200m are possible.
3)
When a C-NET adapter is connected to the RS485 interface, you can only specify a baud rate of 9600bit/s or
19200bit/s.
4)
The start and end code can only be used in program controlled communication.
5)
If necessary, adjust the response time for the FP Σ 's RS485 interface using the SYS1 instruction (see page
169).
6)
Setting the station number setting switch to a value other than 0 enables the switch setting, and the system
register setting is ignored. In this case, the same station number is allocated to all communication ports. A
maximum of 31 stations can be specified with the switch.
7)
FPG-COM3: Bridge the E terminal and the free (-) terminal on the first and on the last station of the
transmission line to terminate the data bus.
FPG-COM4: Set SW1-1 to ON on the first and on the last station of the transmission line to terminate the data
bus. There is no terminating resistor at the RS232C port.
8)
When the RS485 port (COM port 1) of FPG-COM4 is used, set the baud rate in the system registers to either
19200bit/s or 115200bit/s. Set DIP switch SW1-2 of the cassette to the same setting (see page 162). The baud
rate of the RS232C port of FPG-COM4 can only be set in the system registers. For PLC Link, the baud rate is
fixed at 115200bit/s.
9)
Lower baud rates of 300, 600, and 1200bit/s can be specified using the SYS1 instruction. However, this will not
change the setting value of the system register.