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2.5.2.5 NMEA Filter (NMEA FILTER)
This filter is included to select the correct sentence where several sentence options are possible for the same function.
There are 2 circumstances where such situation can occur:
1. A single sensor which produces different NMEA sentences with the same value.
2. If 2 sensors are connected, which produce different NMEA sentences with the same value.
This filter allows user to select one of the optional sentences to be used in the display. Otherwise the instrument will
react to both sentences and the display values may have a lot of fluctuations.
During installation of the AlphaLine instrument, execute the following procedure to select the correct sentence for its
intended use, see Figure 42: NMEA Filter Menu (example) on page 44.
Figure 42: NMEA Filter Menu (example)
1. In the MENU, touch the ADV SET button.
The PASSWORD screen appears.
2. Key in the password and confirm with the √ button.
The ADVANCED SETTINGS MENU appears.
3. Touch the NMEA FILTER button.
The FILTER MENU appears.
4. Select FILTER ID 1, 2 or 3 depending on the type of sensor used by touching the < or > buttons.
5. Select the correct SENTENCE FILTER by touching the + or – buttons.
6. Touch the √ button to confirm.
2.5.2.6 Serial Port Monitor (SERIAL MON)
It is possible to show serial data transmitted and received over the serial ports.
Usually, NMEA signals should be viewed as ASCII data and Modbus data should be viewed as HEX data. Received data
as well as sent data can be viewed (but not simultaneously). Select the appropriate button (Tx/Rx). For NMEA, Rx is
normally used.
44 | Operation
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