Danfoss Modbus RTU Module User guide

User guide

Modbus RTU Module

for heat meter SonoMeter 30

Applications		The Modbus RTU module is destined to heat
		meters in order the heat meters to Modbus RTU
		network using EIA-485 channel.

Features	• Galvanic isolation EIA-485 network interface used for easy and safe connection up to 256 devices
	in one network bus.
	• Modbus RTU Slave protocol is realized according to specifications by Modbus Organization.
Power supply	Polarity independent connection for SELV power supply – connectors 60 and 61
	Voltage:	12-24 V(AC/DC)
	Maximum power consumption:	2 W max.
	Typical supply current:	50 mA

Communication interface

Connectors	90 (noninverting, +) and 91 (inverting, -)
Communication protocol	Modbus RTU
Baud rate (bits per second)	1200, 2400, 4800, 9600-default,19200,38400, 56000, 57600, 115200
	(8 data bits, even parity bit, 1 stop bit)-default
Data format8E1	8O1	(8 data bits, odd parity bit, 1 stop bit)
	8N2	(8 data bits, none parity bit, 2 stop bits)

Status LED and Status	Status LED is signalizing every Modbus communication event. Status LED is blinking on during
Button functionality	request and response sending.
	Press the button, then power on the module and hold the button pushed longer than 15seconds to
	reset device to factory settings (set Modbus Slave ID todefault value 1, the Update Rate parameter to
	default 10 minutes and the communication interface to defaults parameters –9600 bps baud rate and
	8E1 data format).

© Danfoss | 2018.02

BC262356385429en-000101 | 1

User guide	Modbuster RTU module for SonoMeter 30

Modbus RTU Module for	Parameters which can be changed:
heat meters	•	ModBus address (Slave ID);
	•	Update Rate Data from Meter;
	•	Baud Rate
	•	Parity
	•	Stop Bits
	Parameters can be changed using software called “Modbus Reader”.
	1.	First of all you need to open attached reading scenario called “Modbus.scn”. When it is opened,
		the main window which present in.

Fig 1 will be seen.

2.Then change device address, default is “1”.

3.Then click “Port Settings”.

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© Danfoss | 2018.02

User guide	Modbuster RTU module for SonoMeter 30

Modbus RTU Module for	4. Then immediately opens new window. In that new window choose the correctly parameters to
heat meters (continuous)	read device.
	• Parity – “Even”
	• Stop Bits – “1 bit”
	• Bits – “8”
	• Baud rate – “9600 (default)”
	Then click “Ok”

5.Read the actual Modbus card.

6.In the value column near the parameter which you want to change simply enter the changeable value ant then press the button “Send command”. After this the parameter will be changed. In order to read Modbus card again you have to change “Port settings” or “Device address” if it has been changed.

7.If you need reset the ModBus module, you need to turn off the power supply from the 230V. Wait when the module discharge (about 5-10sec) and hold on the module “set” button then plug in 230V. You need to hold on the button until “LINK” led blinked. After all, the ModBus address back to default address.

© Danfoss | 2018.02

BC262356385429en-000101 | 3