Vaisala GML20 User Manual
GML20 LonWorks
®
module
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
1 2007-07-10
GML20 LonWorks
®
module
4. When configurating the transmitter, press the blue service button (marked SERVICE)
on the GML20 module and the transmitter sends its service pin message to the
configuration unit. The service LED lights up when the button is pressed. After
configuration, close the transmitter cover. During normal operation, the LED
indicates the following:
dark = the transmitter configuration and operation are in order
lit = there is something wrong with the transmitter
blinking = the transmitter has not been configured (delivered in this mode)
5. Close the transmitter cover.
TECHNICAL DATA
LonWorks® interoperable
twisted pair free topology network type TP/FT at 78 kbs
additional two wires needed for powering the transmitter
can be connected to both powered and non-powered networks
external interface (.xif) file available on request (part no. 19412GM)
GUARANTEE
Vaisala issues a guarantee for the material and workmanship of this product under
normal operating conditions for one (1) year from the date of delivery. Exceptional
operating conditions, damage due to careless handling and misapplication will void
the guarantee.
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