Technical Note
Overview
This document provides instructions for adjustment of relative humidity and temperature in Vaisala
HMD82M and HMW88M humidity and temperature transmitters.
For the adjustment procedure, you will need the following:
•
USB service cable (order code ASM212800)
•
Computer with:
•
Medium-size crosshead screwdriver (Pozidriv) for the screws on the cover
•
Small slotted screwdriver for the screw terminals
Using Service Port
The HMD82M and HMW88M transmitters have a serial interface on the component board for user
adjustment. You can connect to it through the 4-pin M8 service port connector on the transmitter.
Vaisala offers an optional USB service cable (order code ASM212800) for connecting the transmitter to
your PC.
The service port is intended for short-term use such as adjustment. For permanent installation, use the
analog output.
Adjustment of Relative Humidity and
Temperature
HMD82M and HMW88M Transmitters
•
Windows operating system
•
Free USB port
•
Driver for the USB service cable installed. See
(page
2).
•
Terminal application (for example PuTTy). See
(page
2).
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Any reproduction, transfer, distribution or storage of information contained in this document is strictly
Vaisala Oyj
prohibited. All specifications — technical included — are subject to change without notice.
Vanha Nurmijärventie 21
FI-01670 Vantaa, Finland
Phone:+358 9 8949 1
© Vaisala 2018
Taking USB Service Cable into Use
Connecting to HMD82M/HMW88M
M212167EN-A