User Manual

16
Smart Infrastructure
CE2N5324en
2019-06-27
In addition to the M-bus connection facility, the WZU-MI module has 2 pulse inputs to
connect metering pulses from hot and cold water meters with Reed contact, relay or open
collector. The cumulated volume is calculated based on the pulses and the set pulse
valency, stored in the processor unit at 5-minute intervals and passed on via M-bus.
NOTICE
The volume values calculated by the meter from the pulse inputs cannot be officially
calibrated.
In addition to possible power supply from the M-bus connection, the WZU-MI module is
equipped with a battery. It powers the module processor and the pulse input, if no M-bus
voltage is applied. Either isolated contacts (e.g. relay or Reed contacts) or electronic
transmitters (open collectors) can be used as pulse transmitters for the pulse inputs. If an
open collector circuit is used as the transmitter of the pulse inputs, the cable must always be
electrically isolated from the M-bus inputs of the WZU-MI module.
BACnet/Modbus module
WZU-485E-BAC
WZU-485E-MOD
The processor unit uses both modules to communicate over ModBus® or BACnet
TM
.
The ModBus® module is suitable (and preconfigured) for data transmission per the
ModBus®-RTU protocol over RS485.
The BACnet
TM
module is suitable (and preconfigured) for data transmission per the
BACnet
TM
protocol over RS485 and BACnet
TM
MS/TP.
Technical design
WZU-485E-MOD RTU communication over RS485, transmission rate up to 19200
baud, setting the transmission rate and parity of the software (USB,
cable connection), refresh rate up to 10 sec. For UC50.. and for
UH50.. as of firmware 5.15 and higher
WZU-485E-BAC MS/TP communication over RS485, transmission rate up to 76800
baud, setting the transmission rate and parity of the software (USB,
cable connection), refresh rate up to 10 sec. For UC50.. and for
UH50.. as of firmware 5.15 and higher
Both modules are externally powered with AC/DC 24 V and galvanically isolated from the
processor unit.
Switch off the module power supply before connecting it to the PC using the USB cable.
The micro USB interface is used exclusively to configure the communication protocol and
speed.