A1-User’s Manual
31
4)
Sinking and Source Modes selection (Output signal)
5)
Communication Connect
RXP
RXN
Transmit/Receive
+side
Transmit/Receive
-side
The termination resistor of the RS 485 2nd communication has a purpose of preventing the
distortion and attenuation of the communication line. This resistor means the impedance
matching resistor in long distance transport of RS 485 data. The termination resistor is inserted
only in the final stage in single line.
<Terminating resistance selection switch (SW1)>
Default Status: Terminating resistance ON
Regarding terminating resistance, only applied to RXP-RXN terminals
Turn off the switch when master communicate more than one of VFD
(For example master: PLC, DCS, PC and etc)
RS-485 Terminating resistance SW1 On:
RS-485 Terminating resistance SW1 Off:
Sin
k T
ype
RN0(RN2)
RN1(RN3)
COM
24V
VFD
PLC
Sou
rc
e T
yp
e
RN0(RN2)
RN1(RN3)
COM
24V
VFD
PLC