2018-05-09
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module) or under the flap of the radio module unit packaging (if module was purchased separately). The radio module starts sending data
telegrams only after the meter has recorded a minimum 20 liters of volume by the flow transducer.
Fig. 5.4. Installation the Radio wM-Bus module in the meter’s calculator.
5.2.5. Installation of the Modbus/BACnet module
Module installation procedure:
1.
Follow steps from 1 to 4 described in "Installing the M-Bus module" procedure.
2.
By means of pliers remove the protective cap from the rightmost sealant hole in the bottom part of calculator
enclosure.
3.
Insert the data communication cable in sealant hole and route the cable through an available cable fittings
and make a strain relief protecting wire against being pulled out from the outside.
4.
Connect wires of data communication cable to the screw terminals of the Modbus/BACnet module according assignment from Table 10.2.
5.
Install the external power supply module according to procedure in p. 5.2.6. and connect additional power cable from external power supply
module terminals to the power supply terminals on the Modbus/BACnet module (see Fig. 5.5). The connection is bipolar. For full terminal
assignment of the external power supply module see Table 10.2.
6.
Follow steps from 11 to 13 described in p. 5.2.6. concerning Installation of the external power supply module.
7.
Close the lid of the calculator, fasten the latches on the sides of the calculator enclosure and mount again the installer's security seals.
Fig. 5.5 Conencting Modbus/BACnet module to external power supply module.
The Modbus/BACnet module enables reading the data from the heat and cooling meter with an EIA-485 (RS-485) interface over a wired
Modbus/BACnet network. Default settings: baud rate: 2400 bps, data format: 8E1 (8 data bits, 1 stop bit, parity bit), device address: 1 (slave
ID), transmission data update time: 10 minutes. A single network can include a maximum of 256 devices.
The module has a “PWR” LED indicating the power supply of the module and “LINK” LED which is flashing when a query is received or a
response is transmitted to indicate communication with the Modbus/BACnet network. Module is equipped as well with „SET” button that could
reset module to factory settings (transmission baud rate, data format, device address and transmission data update time). To restore default
settings in module you should disconnect it from the power supply source, press the “SET” button and turn on power supply again without
releasing the button, which should be hold for at least 15 seconds until the “LINK” LED start to blink steadily.
The module has a factory reset button which, when pressed and held for more than 15 seconds, restores all default settings (transmission baud
rate, data format, device address and transmission data update time).
