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rs-485 – internal interface
rs-485 - user interface
The internal rs-485 interface is used for communicating between up to 8 HYDROVARs in a multi-pump
application. This connection uses terminals X4/4-6 on the control card, or terminals X2/1-3 on the power unit.
(Example: using one master and three basic drives.)
Using the rs-485 – user interface on the control card, one or more HYDROVAR can communicate by stan-
dard Modbus-protocol with an external control device (e.g. PLC). This interface can be used for controlling the
HYDROVAR with external devices. also available on HYdroVar single drives.
do not use the internal interface for communicating with Modbus!
X4
X4
6 Gnd
5 sio +
4 sio -
3 Gnd
2 sio +
1 sio -
GND
SIO +
SIO -
GND
SIO +
SIO -
GND
SIO +
SIO -
GND
SIO +
SIO -
6
5
4
X4
X2
X2
X2
HYDROVAR Master Inverter
Control Card
HYDROVAR Basic Inverter
Power Unit
HYDROVAR Basic Inverter
Power Unit
HYDROVAR Basic Inverter
Power Unit
GND
SIO +
SIO -
3
2
1
X4
HYDROVAR User Interface
GND
SIO +
SIO -
PLC
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