Vaisala GML20 - Manual

GML20 LonWorks
®
module
1 2007-07-10
MOUNTING AND INSTALLATION
The GML20 LonWorks
®
interface module enables communication between a LonWorks
®
network and GM20 series transmitters over a twisted pair.
1. Open the transmitter cover. Remove the jumper from the pin connector at the center
of the circuit board.
2. Pull the two output wires through the hole at the bottom of the housing. When
connecting them to the screw terminal marked ' NET ' of the GML20, hold the module
in one hand and make connections with the other (see Figure 1). The polarity can be
freely selected. Note that as all NDIR transmitters consume power, an additional
power supply is always needed. Check that the nominal 24 V supply is connected
between terminals + and - on the transmitter's mother board. Analogue output signals
can be used simultaneously with the LonWorks
®
module.
3. Install the module on the 2- and 5-pin connectors as indicated in Figure 2.
Figure 1: Connecting the wires to the GML20 module
Figure 2: Installing the GML20 module