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The Modbus RTU MAC address range for the transmitter is 1 ... 247.
Configuring an address above the range maximum results in the address defaulting back to
the maximum address (127 or 247). Addresses below the range minimum default to the
minimum address (0 or 1).
Bit Rate and Parity Options
• The bit rate 4800 is used only for Modbus RTU (use 9600 and above for BACnet MS/TP).
• If the bit rate DIP switches are all set to OFF (left), the following defaults are used:
• Modbus RTU: 19200
• BACnet MS/TP: 38400
• The parity selection (N/E) only has an effect on Modbus RTU communication.
Additional Configuration Options and Further Information
For HMD65 Modbus registers, see
For a description of the HMD65 BACnet protocol implementation and further information on
configuring BACnet, see the BACnet reference documentation in HMD65 User Guide available
at www.vaisala.com/hmd60.
To configure Modbus and BACnet settings beyond the communication settings available with
DIP switch selections, use Vaisala Insight PC software (see
(page 13) and instructions in HMD65 User Guide).
Modbus Registers (page 18).
Connecting to Insight Software
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