We decided to completely rework our RS485 to OpenTherm converter. The main motivation was to unify the two versions for two different protocols into a single device. DM-OT2 replaces both DM-OT for the ARION protocol and DMM-OT for the MODBUS RTU protocol. The protocol to be used is simply selected by switching the corresponding switch on the body of the converter. Moreover, in the case of the MODBUS RTU protocol, we added the 115 kBd communication rate.
Complete technical documentation and more information can be found on the web page of the converter – DM-OT2.