User's Guide _______________________________________________________________________
36 ___________________________________________________________________ M211399EN-G
Indicators on the Display
Indicator Position on Screen Meaning
Top right
Communication arrows. Shown only on
models with digital output. Down arrow is
shown when transmitter detects valid traffic
on the RS-458 line. Up arrow is shown when
transmitter is transmitting to the RS-485 line.
Top right
Is shown when relay contacts are open
(HMW93 and TMW93 only).
Top right
Is shown when relay contacts are closed
(HMW93 and TMW93 only).
Top left
Is shown when an MI70 Indicator is
connected to the service port.
Bottom left
Is shown if an error is active. The error
message is written after the indicator. See
section Error Messages on page 72.
Service Port
You can connect to the service port on the HMW90 series transmitters
using a computer or an MI70 indicator. The MI70 indicator is the hand-
held display device that is included with, for example, the Vaisala
HUMICAP
®
Hand-Held Humidity and Temperature Meter HM70.
CAUTION
The service port is not galvanically isolated from the rest of the
transmitter electronics. Connect only equipment with a floating power
supply (not grounded) to the service port. If you connect a device that is
grounded to a different potential than the transmitter’s power supply, you
will affect the accuracy of the transmitter’s analog outputs. You may
even affect the transmitter’s functionality or cause damage to the
transmitter.
Connecting With an MI70 Indicator
When connecting using an MI70 indicator, use the connection cable for
HM70 hand-held meter (Vaisala order code 219980). The following
functionality is available when using the MI70:
- Standard MI70 functions such as viewing, logging, and graphs of
measurement results.
- Calibration and adjustment fuctions for the transmitter. For more
information, see section Adjustment Using an HM70 on page 67.
- Setting of the pressure compensation value for humidity measurement
(
Environment
menu in the MI70).
