
115
Technical data
Features
• LonWorks
®
interoperable
• Twisted pair free topology, network type TP/FT-10 at 78kbps
• Additional two wires needed for powering the transmitter; can
thus be connected to both powered and non-powered networks
• Service button and service LED for simple installation and
configuration
• External interface (.xif) file available on request (GML20
part no. 19412GM, GML20T part no. 19748GM)
• Temperature (GML20T only): Measurement accuracy
0.5 °C (0.9 °F) Measurement range 0 ... +45 °C (+32 ... 113 °F)
Warm-up time 30 min.
Network Variables for CO
2
(BOTH MODELS GML20 AND GML20T)
nviRequest: to request modes for objects within this node
nvoStatus: to report status of objects on this node
nvoCO
2
ppm: this output variable reports the CO
2
level detected by
the sensor
nciMaxSendtime: indicates the maximum period of time that
expires before the sensor object automatically updates all its
output variables (default value: 300 seconds)
nciMinSendtime: indicates the minimum period between output
network variable transitions (default value: 5 seconds)
nciCO
2
MinDelta: indicates the minimum CO
2
level change
required to update the output network variables
(default value: 10 ppm)
LonWorks
®
is a registered trademark of Echelon Corporation.
Networks Variables for Temperature
(GML20T MODEL ONLY)
nvoHVACtemp: this output variable reports the temperature
detected by the sensor
nciMaxStime_temp: indicates the maximum period of time that
expires before the sensor object automatically updates all its
output variables (default value: 300 seconds)
nciMinStime_temp: indicates the minimum period between
output network variable transitions (default value: 5 seconds)
nciMinDelta_temp: indicates the minimum temperature change
required to update the output network variables
(default value: 0.3 °C)
nciTmpOffset: indicates the temperature offset level
(default value: -0.8 °C)
Ref. B210943EN-A ©Vaisala 2010
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rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifi cations — technical included — are subject
to change without notice.
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
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