Danfoss ECL Comfort 210 Instructions Manual

Also see for ECL Comfort 210: Installation guide User guide Installation guide Installation guide Operating guide

Danfoss ECL Comfort 210 Instructions Manual Manual pdf 6 page image

Instructions ECL Comfort 210 / 310, communication description4.1 RS-485 network descriptionThe network used for this module is conditionally compliant(implementation class = basic) with the Modbus over serialline two-wire RS-485 interface. The module uses the RTUtransmission mode. Devices are connected directly to thenetwork, i.e. daisy chained. The network uses line polarizationand line termination at both ends.These guidelines depend on the environmental conditionsand the physical network characteristics: Maximum cable length of 1200 m without repeater 32 devices pr. master / repeater (a repeater counts as adevice)All devices in the network must use the same communicationsettings, i.e. multiple communication settings are not allowed.The module can operate with 19200 or 38400 (default) baud rate 1 start bit 8 data bits even parity 1 stop bit(in total 11 bits).For specific details, please consult the specifications Modbus Application Protocol V1.1a. Modbus over Serial Line, Specification & Implementationguide V1.0both of which can be found on http://www.Modbus.org/4.1.1 Network layoutsFigure 4-2 illustrates how termination and line polarizationmust be added. For specific details, consult the Modbusspecifications.M LP TT MLPTRMaster (PC)Line PolarizationTerminatorRepeaterMR RLPTTTT TLPT TLPTLP M LP TTFigure 4-2: Three daisy chain network layoutsDanfoss District Energy VI.LG.V3.02 DEN-SMT/DK 6