Technical information

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Communications Wiring
Caution:
• Communication wire pairs must be dedicated to MN-Sx (S-Link) and MicroNet
LONWORKS network (LON) communications. They cannot be part of an active, bundled
telephone trunk.
• Shielded cable is not required for S-Link or LON wiring.
• If the cable is installed in areas of high RFI/EMI, the cable must be in conduit.
• If shielded wire is used, the shield must be connected to earth ground at one end only
by a 470K ohm 1/4 watt resistor. Shield must be continuous from one end of the trunk
to the other.
Communications wiring includes a connection between the controller and a TAC I/A Series
MicroNet Sensor via the S-Link and a connection between the controller and the MicroNet
LONWORKS Network (LON). An optional LONWORKS Network connection between the
controller and one TAC I/A Series MicroNet Sensor is also possible.
Sensor Link (S-Link) Wiring
S-Link wiring powers and enables the MN-Sx sensor. The S-Link needs at least 24 gage
(0.51mm), twisted pair, voice grade telephone wire. The capacitance between conductors
cannot be more than 32 pF per foot (0.3m). If shielded cable is used, the capacitance
between any one conductor and the others, connected to the shield, cannot be more than
60 pF per foot (0.3m). Maximum wire length is 200 ft. (61m).
Note:
• Controller supports one TAC I/A Series MicroNet Sensor (MN-Sx).
• S-Link wiring is polarity insensitive.
• If conduit is used between a TAC I/A Series Sensor and a controller, the MicroNet
L
ONWORKS network and S-Link wiring can be in the same conduit, however, they must
be separate cables.
• S-Link wiring can be in the same conduit with UI, AO, and DI Wiring.
MicroNet LONWORKS Network (LON) Wiring
An approved Category 4 or 5, twisted-pair (two conductors) cable may be used for both
connecting to the MicroNet LONWORKS Network and the optional LONWORKS Network
connection between the controller and MN-Sx sensor. LONWORKS Network wiring is polarity
insensitive.
Caution: Do not mix with UI, AO, DI or DO types of wiring. If conduit is used between a
TAC I/A Series Sensor and a controller, LONWORKS Network wiring and S-Link wiring can
be in the same conduit, however, they must be separate cables.
MN 100, MN 150, and MN 200 controllers use L
ONWORKS Free Topology Transceiver (FT
3150) and support polarity insensitive bus (daisy-chain) and free (all combinations of star,
tee, and loop) wiring topologies. A maximum of 62 nodes can be connected per segment.
Note: See TAC I/A Series MicroNet System Engineering Guide, F-26507 to design a
MicroNet L
ONWORKS TP/FT-10 network, including recommended topologies and
approved cable types.
• Use of the LON terminals to connect to the MN-Sx sensor permits use of the
sensor’s built-in LON Jack.
• To preserve the integrity of the network, the LON wiring connecting a TAC I/A Series
MicroNet controller to an MN-Sx sensor must be run to the sensor and back, in
daisy-chain fashion. A wire “spur” must not be used to connect the sensor to the
controller.
• While the MN-Sx sensor is not counted as a “node” in the LonWorks network
(LON), all LON wiring to the sensor must be counted when determining the length
of the FTT wiring segment.