Extension for a Modbus RTU connection

The heat pump manager can communicate with external systems via the LWPM 410 extension, which is available as an accessory. The Modbus protocol, which is freely available on the market and can be implemented on other bus systems, serves as the interface protocol. It should be noted that over 100 variables can be transferred to the extension, which can be read out individually or transferred to a higher-level bus system.

• 1 1 System requirement
• 2 2 Modbus / RTU
• 3 3 Function codes supported
• 4 4 installation
• 5 5 Heat pump manager settings
• 6 6 Data point list
  • 6.1 6.1 Operating data
  • 6.2 6.2 history
    • 6.2.1 6.2.1 Example of heat quantities*
  • 6.3 6.3 settings
    • 6.3.1 6.3.1 1st heating circuit
    • 6.3.2 6.3.2 2nd / 3rd heating circuit
    • 6.3.3 6.3.3 Mode
    • 6.3.4 6.3.4 Hot water
    • 6.3.5 6.3.5 Swimming pool
    • 6.3.6 6.3.6 2. Heat generator
  • 6.4 6.4 Selection of time functions
    • 6.4.1 6.4.1 Lowering / raising
    • 6.4.2 6.4.2 Hot water block
    • 6.4.3 6.4.3 Thermal disinfection
    • 6.4.4 6.4.4 DHW circulation pump
    • 6.4.5 6.4.5 Ventilation raising / Silent Mode
  • 6.5 6.5 Display ads
    • 6.5.1 6.5.1 Status reports
    • 6.5.2 6.5.2 Lock
    • 6.5.3 6.5.3 Fault messages
    • 6.5.4 6.5.4 Sensors
  • 6.6 6.6 Entrances
  • 6.7 6.7 Outputs
  • 6.8 6.8 Time alignment
• 7 7 Function descriptions
  • 7.1 7.1 Smart-Grid / SG Ready
    • 7.1.1 7.1.1 Operating states
    • 7.1.2 7.1.2 Implementation on the heat pump manager
• 8 8 Contact

LWPM 410 extension Open
Order reference	LWPM 410
item number	339410
Device type	Slave
protocol	RTU
baud rate	1200, 2400, 4800, 9600, 19200
Data format software version <L23	8N1
Data bits	8th
Parity	None
Stop bits	1
Data format software version> L23	8N1, 8N2, 8O1, 8O2, 8E1, 8E2
Data bits	8th
Parity	None, Even, Odd
Stop bits	1, 2
Network address	1 ... 207
interface	RS485
Cable sizing	2 x 0.5 mm² shielded max.50m
Connection type	Screw terminals

1 System requirement

The minimum system requirement for using the LWPM 410 extension is a Dimplex heat pump with heat pump manager WPM 2006, WPM 2007 or WPM EconPlus with software version H_H50 and higher.

2 Modbus / RTU

The Modbus protocol is a communication protocol based on the master / slave principle. A master device controls and monitors the entire data transmission in the network / bus system, the connected slave devices only respond when requested. The Dimplex heat pump manager can process the Modbus protocol in RTU mode.

3 Function codes supported

4 installation

The installation of the LWPM 410 extension takes place on the heat pump manager in the designated slot “Serial Card / BMS Card”. The following steps are carried out:

• De-energize the heat pump manager

Open

• Remove the cover of the “Serial Card / BMS Card” slot with a small screwdriver

Open

• Installation of the LWPM extension

Open

• Breaking out the existing cover

Open

• Close the opening with the enclosed cover

 

 

• Supply the heat pump manager with voltage

5 Heat pump manager settings

Depending on the software version on the heat pump manager, the following settings must be checked and adjusted if necessary:

• from WPM_H with the key combinations «menu" and "Enter » in the "Modem" settings

• from WPM_L with the key «menu»In the" Network "settings

  • Protocol: Modbus

  • Baud rate: 9600 → factory setting, adapt to the network if necessary

  • Address: 001 → factory setting, if necessary adapt to the end devices in the network

• from WPM_L20.2 with the key «menu»In the" Network "settings

  • Protocol: Modbus

  • Baud rate: 9600 → factory setting, adapt to the network if necessary

  • Address: 001 → factory setting, if necessary adapt to the end devices in the network

  • Address range: 1..127 → absolutely required

• ab WPM_M1.3

  • Protocol: Modbus

  • Baud rate: 9600 → factory setting, adapt to the network if necessary

  • Address: 001 → factory setting, if necessary adapt to the end devices in the network

  • Address range: 1 … 207 → absolutely required

6 Data point list

6.1 Operating data