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19
Use of RS485 communication function
The following explains the connections and settings of the RS485 terminal switch and 2-wire/4-
wire selection switch when the RS485 communication function is used.
RS485 terminal
Note:
• For the twisted-pair cable, use a shielded AWG22 (0.33 mm
2
) or larger cable with low
impedance cable.
R (A)
R (B)
<4-wire communication>
<2-wire communication>
1
2
3
4
5
RS
485
A
R
T
B
A
B
GND
1
2
3
4
5
GND
T (A)
T (B)
R (A)
R (B)
GND
T (A)
T (B)
Data reception
Data transmission
Data reception
Data transmission