• Computer with
• Windows operating system
• Terminal application
• Free USB port
• Driver for Vaisala USB cable installed
• Vaisala USB cable for computer connection (219690)
• Two temperature references in range -40 ... +60 °C (-40 ... +140 °F) with more
than 30 °C (86 °F) dierence
• Medium size cross-head screwdriver (Pozidriv)
1. Prepare the HMDW110 series transmitter for a service port connection.
a. Open the cover of the HMDW110 series transmitter.
b. If the terminal block for terminals 5 ... 8 is wired, pull it out. This disconnects the
transmitter from supply voltage and prevents possible equipment damage that may
be caused by ground loops. The locations of the terminal blocks and the service port
are shown in Component Board (page 13).
c. If the other terminal block is wired (terminals 1 ... 4), pull it out also. This prevents the
communication between the transmitter and the RDP100 remote display panel from
interfering with your connection.
2. Plug in connection cable 219690 to the service port of the HMDW110 series transmitter,
and the other end to a free USB port on your computer.
3. Insert the probe in the first temperature reference.
4. Wait at least 15 minutes for temperature to stabilize.
5. Start a terminal application on the computer and open a new terminal session to the
transmitter. For more information, see Terminal Application Settings (page 31).
6. Give the errs and send commands to check that there are no active errors, and that the
measurement is working:
errs
0000h
No errors
send
T= 23.1 'C RH= 11.5 %RH Td= -7.3 'C Tw= 9.9 'C h= 28.5 kJ/kg
7. Give the l command to view the currently active user adjustment parameters.
Example: Default values of the user adjustment parameters (no user adjustment done):
Cp offset : 0.00000000E+00
Cp gain : 1.00000000E+00
T offset : 0.00000000E+00
T gain : 1.00000000E+00
Chapter 7 – Maintenance
63
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