Wiring considerations and guidelines for network
integrations
Table 3: Network Engine Ethernet network rules
Category
Rules and Maximums
General
Star topology with network switches
Number of Devices Maximum of 1,000 devices permitted at one site in the
Metasys
network.
2,000 m (6,600 ft) for plastic/glass fiber optic with external adapter
Line Length and
Type
10 BaseT: 100 m (330 ft) CAT5 cable
100 BaseT: 100 m (330 ft) CAT5 cable
1000 BaseT: 100 m (330 ft) CAT5E cable
Terminations
For 10/100/1000 BaseT, no line terminators allowed.
Table 4: Guidelines for BACnet protocol MS/TP network topology
Category
Rules and Maximums
General
Two MS/TP Bus trunks, daisy chain topology only. No T or star topology
configurations.
Number of Devices 100 devices per FC Bus with no more than two repeaters between network
engine and any device and a maximum of 50 devices between repeaters
Note:
If TEC2000 Series Thermostat Controllers or third-party devices
are used on the FC Bus, the maximum total number of devices is 64 and
the maximum length is 1,219 m (4,000 ft).
1,500 m (5,000 ft) cable without a repeater
4,500 m (15,000 ft) cable from network engine to the farthest FC Bus device
(three bus segments of 1,500 m [5,000 ft] each, separated by repeaters)
2,000 m (6,600 ft) between two fiber modems
Line Length and
Type
Cable Type
Stranded 0.6 mm (22 AWG) 3-wire twisted, shielded cable is recommended.
Stranded 0.6 mm (22 AWG) shielded 4-wire (two twisted-pairs) shielded cable
is acceptable.
Note:
Use only twisted pair wire. On applications using 4-wire (two
twisted-pairs) cable, isolate and insulate unused conductor. Refer to
the
MS/TP Communications Bus Technical Bulletin (LIT-12011034)
for more
information.
Terminations
Two FC devices with EOL switches in the ON position, one at each end of
each FC Bus segment
Note:
Refer to the
MS/TP Communications Bus Terminal Bulletin (LIT-12011034)
for information
on cable types and lengths.
Table 5: Guidelines for N2 network topology
Category
Rules and Maximums
General
Two N2 Bus trunks supported.
NAE55/NIE55 Installation Guide
22
