Figure 1. HMD60 transmitter board: service port, DIP switches, trimmers and screw terminals 1 Service port for MI70 handheld indicator and Insight PC software cable connection. 2 DIP switches for humidity parameter selection (HMD62). 3 Trimmer for humidity measurement adjustment (HMD62). 4 Screw terminals for humidity measurement output (HMD62). Note: in HMD62, the RH screw terminals must always be wired. The transmitter receives power through the RH screw terminals, and does not power on if only the temperature (T) terminals are wired. 5 Screw terminals for temperature measurement output. 6 Trimmer for temperature measurement adjustment. The HMD62 board (shown in Figure) includes options for both humidity and temperature output. The TMD62 board includes only components limited to temperature output options. See Wiring for more information.