The Modbus registers available for HMD65 include measurement output registers in metric and non-metric units, pressure compensation setpoint configuration, status registers, and communication test registers. For status registers, see HMD65 User Guide.
The Modbus communication settings are configured using the DIP switches on HMD65 component board: see Modbus and BACnet Communication (RS-485).
Registers are numbered in decimal, starting from one. Register addresses in actual Modbus messages (Modbus Protocol Data Unit (PDU)) start from zero.
Please check the reference documentation of your Modbus host (PLC) for the notation of Modbus register addresses.
16-bit integers have a maximum value of +32767. Certain measurement parameters can exceed this value when x100 scaling is used (see measurement registers 0100hex … 0107hex and 0180hex … 0187hex). Whenever possible, it is recommended to use 32-bit float values.