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Document 51996 AFP-300/400 NION Installation Rev. A1 03/04/03
1.8 SMX Network Connection
The UniNet facilities monitoring system is distributed via a LonWorks™ network. This high-speed network allows
communication between field nodes and a Local Area Server or a BCI. NION modules provide the communica-
tion links between monitored equipment and the network.
J1 SMX Connection
A twisted pair of wires or dedicated fiber-optic cable is used for data transmission in the UniNet network. The SMX
transceiver connects the NION to the network using one of these wiring types. The network SMX transceiver
daughter board is a component of every NION. This transceiver provides the network medium interface for NION
network communication.
There are four styles of SMX transceivers: FTXC (Free Topology), S7FTXC (Style 7 FTXC), DFXC, and FOXC. The
proper transceiver must be ordered separately for the specific medium it is to utilize.
FTXC
The FTXC transceiver is used for FT-10 (Free Topology) wire bus and star network configurations.
The wire must be:
•
Twisted pair cable.
•
UL listed for use in a power-limited fire-detection system (if used in conjunction with a fire monitoring
network).
•
Riser, plenum, or non-plenum cable, according to local fire alarm wiring codes.
FOXC
The FOXC transceiver is used for point-to-point optical fiber. For the FOXC, two strands are required per segment;
one dedicated to transmit, the other to receive. The FOXC can have no more than 8db of attenuation between
nodes.
DFXC
The DFXC is a bidirectional optical fiber transceiver; it requires only one strand between nodes. The DFXC can
have no more than 12.5db of attenuation between nodes.
Transceivers are mounted to the NION mother board using a header strip and two standoffs. Refer to the board
layout diagram for the placement of the SMX transceivers.
NOTE: Fiber optic segments require fiber that is:
•
Multi-mode.
•
62.5/125 µm dia.
NOTES: Use only wire for power limited systems. Power limited wire
runs use type FPLR, FPLP, FPL or equivalent cabling per NEC 760.
All non-fiber network connections are transformer isolated making all
network communication immune to ground fault conditions. There-
fore, no ground fault supervision of the Echelon network is required
or provided.
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