
www.vaisala.com
114
GML20 and GML20T
LonWorks® Options for GMD/W20 Series
Signifi cant savings
Vaisala's GML20 and GML20T are
interface modules for distributing
signals from Vaisala CARBOCAP
®
Carbon Dioxide Transmitter Series
GM20 digitally to a LonWorks
®
network over a twisted pair.
GML20T module connects a Vaisala CARBOCAP
®
Carbon Dioxide Transmitter
GMW21 to a LonWorks
®
network.
The GML20 Module distributes
CO
2
signals; the GML20T Module
distributes both CO
2
and temperature
signals. The GML20T Module can
be used only with the Vaisala
CARBOCAP
®
Carbon Dioxide
Transmitter GMW21.
The use of these modules and
Vaisala CARBOCAP
®
Carbon Dioxide
Transmitter Series GM20 with a
LonWorks
®
networked control
system contributes to considerable
savings in cabling, installation and
maintenance costs.
Intelligent LonTalk®
protocol
In a LonWorks
®
network, devices
called nodes communicate with each
other using the LonTalk
®
protocol.
Every node consists of a Neuron
®
Features/Benefi ts
▪
Enables digital communication
between Vaisala CARBOCAP®
▪
Carbon Dioxide Transmitter
Series GM20 and LonWorks®
▪
GML20 for CO
2
signal
▪
GML20T for CO
2
+ T signal
▪
Savings in cabling, installation
and maintenance costs
GML20 (left) and GML20T modules
enable digital communication between
the Vaisala CARBOCAP
®
Carbon
Dioxide Transmitter Series GM20 and a
LonWorks
®
network.
chip and a transceiver. The Neuron
®
chip is a microprocessor which
contains an application program and
LonTalk
®
protocol. The transceiver
adapts the Neuron
®
chip into the
hardware environment used. The
nodes communicate with each other,
sending messages containing the
value of the desired variables.
With Vaisala modules, these
variables are CO
2
(GML20) or CO
2
and temperature (GML20T). Some
network variables are so-called
con guration variables, which are
used to de ne the behavior of the
node. With the GML20 and GML20T,
they are used to designate how much
the temperature and/or carbon
dioxide level must change before a
measured value is sent again.
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