Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 42)

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X4 RS485-Interface
1 User SIO-Interface: SIO-
2 User SIO-Interface: SIO+
3 GND, electronic ground
User interface
for external communication
4 Internal SIO-Interface: SIO-
5 Internal SIO-Interface: SIO+
X4/
6 GND, electronic ground
Internal interface
for multi-pump-systems
RS-485 – Internal interface RS-485 - User interface
The internal RS-485 Interface is used for the communication between up to 8 HYDROVAR
in a multi-pump application. For the connection of each HYDROVAR via the RS-485
interface the terminals X4/4-6 on the control card, and either the terminals X2/1-3 on the
power unit can be used. (Connection example: using one
MASTER - and three BASIC Inverters)
By using the RS485 – User interface on the control card, one or more HYDROVAR can
communicate via the standardized Modbus protocol with an external-control-device (e.g.
PLC). This interface can be used for parameterization and controlling the HYDROVAR via
external devices. Also active for HYDROVAR SINGLE Inverter - configuration.
Do not use the internal interface as user interface and vice versa!