Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 33
Indicators on the Display
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.
MI70 connection indicator. Is shown when an
MI70 Indicator is connected to the service
Alert indicator and error text. Is shown if an
error is active. The error message is
written after the indicator. See section
Error Messages on page 74.
Service Port
You can connect to the service port on the GMW90 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
CARBOCAP
®
Hand-Held Carbon Dioxide Meter GM70.
CAUTION
ervice 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
accuracy of the transmitter’s analog outputs. You may
even affect the transmitter’s functionality or cause damage to th
e
Connecting With an MI70 Indicator
When connecting using an MI70 indicator, use the connection cable for
GM70 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 a Hand-Held Meter on
page 68.
- Setting of the pressure compensation value for carbon dioxide and
humidity measurement (Environment menu in the MI70).
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