csen

DM-OT2 – The OpenTherm/plus converter

The DM-OT2 is a converter of the RS485 interface (with MODBUS RTU or ARION protocol) to the OpenTherm/plus (OT/+) interface. The converter operates as a control unit with the OpenTherm interface in the master role and enables control of several types of boilers. The converter communicates with the boiler continuously, independently from the communication with the control system. Up to 63 DM-OT2 converters can operate at the same time in an RS485 network. With the MODBUS protocol selected, the converter allows reading or writing any available DATA-ID offered by peripherals to the OpenTherm/plus network. This converter replaces both older versions – DMM-OT (MODBUS) and DM-OT (ARION).  
  • RS485 line with MODBUS RTU or ARION protocol
  • OpenTherm/plus (OT/+) specification
  • power supply and status indication by LED
  • 35 mm DIN rail mounting
  • power supply 24 V DC / AC
Transfer type
RS485 <-> OpenTherm
Construction
On a 35 mm DIN rail
RS485 communication protocol
MODBUS RTU / ARION (user selectable)
Transmission speed
9600 bps to 115200 bps
Galvanic isolation RS485
Yes
Number of stations on the RS485 network
63
Power supply
20 V ss. up to 30 V DC
Operating temperature range
-40°C to 70°C
Dimensions (w x h x d)
(54 × 90 × 61) mm

Other Related Products

Contractual partners only
  • RS485 line with MODBUS RTU or ARION protocol
  • OpenTherm/plus (OT/+) specification
  • power supply and status indication by LED
  • 35 mm DIN rail mounting
  • power supply 24 V DC / AC
Transfer type
RS485 <-> OpenTherm
Construction
On a 35 mm DIN rail
RS485 communication protocol
MODBUS RTU / ARION (user selectable)
Transmission speed
9600 bps to 115200 bps
Galvanic isolation RS485
Yes
Number of stations on the RS485 network
63
Power supply
20 V ss. up to 30 V DC
Operating temperature range
-40°C to 70°C
Dimensions (w x h x d)
(54 × 90 × 61) mm

Other Related Products

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We often send out our newsletter with news and great offers. We will never disclose your data to third parties and you can unsubscribe from the newsletter at any time.

Unfortunately, we’re unable to offer free samples. As a retailer, we buy all magazines from their publishers at the regular trade price. However, you could contact the magazine’s publisher directly to ask if they can send you a free copy.

You can create a new account at the end of the order process or on the following page. You can view all of your orders and subscriptions in your customer account. You can also change your addresses and your password.

No, you don’t have to create an account. But there are a few advantages if you create an account.

  • You never have to enter your billing and shipping address again

  • Find all of your orders, subscriptions and addresses in your account

  • Download invoices of your orders

No, we don’t have a physical store location at the moment. We accept only orders through our online shop and we’re shipping all orders with the Swiss Post Service. Please visit our shipping section for more details.

From time to time you will find us at design fairs and popup markets in Switzerland. Subscribe to our newsletter and you’ll receive the latest news.

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