BACnet
The BACnet variant used in HMD65 is BACnet MS/TP. For a description of the HMD65 BACnet
implementation, see BACnet Reference (page 54).
Setting Device MAC Address with DIP Switches
Figure 19 MAC Address DIP Switch Example
DIP
switches 32,
8, and 1 set
to ON
The MAC address is
encoded in eight bit binary
form, with each numbered
switch representing a single
bit. This example shows
address 41 selected: DIP
switches 32, 8, and 1
(decimal: 41, binary:
00101001) are set to ON.
Modbus and BACnet MAC Address Ranges
The BACnet MS/TP MAC address range for the transmitter is 0 … 127 (master mode only).
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 eect on Modbus RTU communication.
5.2
Modbus and BACnet Configuration with
Insight
Modbus and BACnet communication settings are configured with the DIP switches on the
HMD65 component board (see Figure 18 (page 26)). In addition to the communication settings
available through the DIP switches, you can configure certain Modbus and BACnet settings
with Vaisala Insight PC software (requires Vaisala USB cable 219690).
For instructions on connecting HMD65 to Insight, see Connecting to Insight Software
(page 18).
Chapter 5 – Modbus and BACnet Communication
27
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