© 2021 All rights reserved. Data subject to change without notice. 29
Rev. C | 2021.12 FCS - Installation Manual
NOTE: LPT-M and LPT-P digital transmitters can be congured as 1, 2 or 3 channel systems
depending on the application requirements. Each channel occupies one of the available
gas channels. Similarly, a CGAS-D gas detector with two internal sensors plus RH and
Temperature sensors would occupy 4 channels of the FCS.
Four-conductor, 16 gauge, stranded wire / cable must be shielded when connecting to digital
transmitters. The voltage supplied by the FCS Controller to the remote digital transmitter
should measure approximately 24 VDC nominal at the transmitter(s). If this voltage is not
attained after installation, the wrong gauge wire may have been used or the wiring run is too
long. 14 gauge wire should be used for longer wire runs to minimize voltage drop.
NOTE: DO NOT USE solid-core wire for connection to wiring terminal strip. Any damage
caused by using solid-core wire will void warranty. Use stranded wire pigtails 18 awg
within the enclosure to connect to the circuit board. The rigidity of solid-core wire can pull
a soldered terminal strip completely off a circuit board and this will not be covered under
warranty.
The CGAS-D, LPT-P and LPT-M transmitter enclosures have several conduit entry locations.
Under most local electrical codes, low voltage wires cannot be run within the same conduit
as line voltage wires.
Commonly used wire colours for positive, negative and signal VDC wires are:
• Red for positive (+) 24 VDC power
• Black for negative (-) Ground
• White, Yellow or Green for signal (A and B)
WARNING: Maximum distance information between the FCS and a remote digital
transmitter can be found in that particular product’s Operation Manual.
6.14 Wiring LNK-XT Network Extender Peripheral Device
The LNK-XT Network Extender Peripheral Device works as a signal booster, allowing
transmission and receipt of gas readings over a larger total area. It extends the range of the
Modbus® communication network allowing a longer distance between the Controller and the
network of gas detectors. The micro controller quickly passes Modbus® information packets
from the master side of the LNK-XT to the extension side, seamlessly without interruption.
If the overall length of the wire run is more than 609 m / 2,000 ft, or if the area is
electronically noisy, you will require an LNK-XT Network Extender to extend the range of
the RS-485 network. The LNK-XT is a digital device and must be connected in a daisy-chain
fashion.
Maximum number of LNK-XT peripheral devices by FCS model:
FCS-4 FCS-8 FCS-32 FCS 128
unlikely to need
unlikely to need,
1 max
3* 3*
**If more than 3 LNK-XT Network Extenders are required, contact CETCI for more information)
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