Vaisala HMW90 - Manual (Page 29)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 27
Dip switches marked Address (Binary Weighting) set the MAC address
of the HMW90 series digital transmitter. The address is encoded in eight
bit binary form, with each numbered switch representing a single bit. For
example:
1209-009
Figure 10 Example of Transmitter Addressing
Addressing with BACnet Protocol
BACnet MS/TP MAC address range is 0 … 255. The transmitter is a
BACnet MS/TP master if address is below 128. Otherwise the transmitter
is a slave.
Addressing with Modbus Protocol
Transmitter is always a Modbus slave. MAC Address range for Modbus
slaves is 1 … 247.
1 2 3 4 5 6 7 8
128 64 32 16 8 4 2 1
ON
Binary: 10100001
Decimal: 161
(128 + 32 + 1)
=