Vaisala HMDW110 - Manual (Page 13)

Component Board
All HMDW110 transmitter models use the same component board and have two
4 ... 20 mA outputs (loop powered). There is also a service port for configuration
and calibration use.
Figure 4 HMDW110 Series Component Board
1 = Terminal block for 4 ... 20 mA current loop outputs.
2 = Service port connector (4-pin M8).
3 = Terminal block for RS-485 output to RDP100 display panel (optional).
You can pull out the terminal blocks from the component board
for easier installation, and to disconnect the transmitter from
power and RS-485 when using the service port.
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2 Product Overview