Xylem HYDROVAR (HV2.1 - 3.45) - Manual (Page 69)

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11 RS 485 - Interface
Standardised Bus-Interface for communication between the HYDROVAR and/or an overruling
external control system.
The data protocol complies with ISO 1745 for RS 485 interfaces and contains the following
configurations:
Data rate: 9600 Baud (1 Start Bit, 8 Data, 1 Stop Bit)
An interface inverter RS 232/RS 485 is necessary in case communication with a 24V interface of
a PC or another external control system is wanted.
The whole interface protocol can be obtained upon request.
12 Auxiliary Texts
These are available for all parameters. To call them up press the buttons ¾ + Ï. Each
auxiliary text then appears as "running text" in the second line of the window.
13 Maintenance
The HYDROVAR does not require special maintenance.
However, the cooling fan and the vents should be freed of dust occasionally. Also the
temperature around the unit should be checked from time to time.
All modifications must be done by qualified technicians! For mounting and repairs at the
HYDROVAR, qualified service technicians are available.
Demounting:
The HYDROVAR must be disconnected from the power supply before any work can be
carried out. Look at the pump- and motor-instruction.
Notes:
When replacing the control card in a plant with more than one pump, ensure that the
software / hardware is compatible with all other control cards.
For further information, please ask your distributor!