Wiring Considerations and Guidelines for Network Integrations
Table 2: NAE-S Ethernet Network Rules
Category
Rules/Maximums Allowed
General
Star topology with network hubs/switches
Number of Devices
Maximum of 1000 devices can be connected to one site in the
Metasys
network.
2,000 m (6,600 ft) for plastic/glass fiber optic with external adapter
Line Length and Type
10/100 BaseT: 100 m (330 ft) Cat5/Cat6 cable
1000 BaseT: 100 m (330 ft) Cat5e/Cat6 cable
Terminations
No line terminators allowed.
Table 3: Guidelines for BACnet Protocol MS/TP Network Topology
Category
Rules/Maximums Allowed
General
NAE-S models support up to two MS/TP Bus trunks, daisy chain topology only.
Number of Devices
100
1
devices per FC Bus with no more than two repeaters between NAE-S and any device and
a maximum of 50 devices between repeaters
1,500 m (5,000 ft)
cable without a repeater
4,500 m (15,000 ft) cable from NAE-S to the farthest FC Bus device (three bus segments of
1,500 m [5,000 ft] each, separated by repeaters)
Line Length and Type
2
2,000 m (6,600 ft) between two fiber modems
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:
The + and - bus leads should be a twisted pair. 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
1
If TEC 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).
2
Refer to the
MS/TP Communications Bus Terminal Bulletin (LIT-12011034)
for information on cable types and lengths.
Table 4: Guidelines for N2 network topology
Category
Rules and Maximums
NAE-S models support up to two N2 Bus trunks.
General
Only daisy-chained devices (with maximum stub length of 3 m [10 ft] to any device)
Number of Devices NAE-S models support up to 100 N2 devices per N2 Bus, with no more than two repeaters between
NAE-S and any N2 device and a maximum of 50 devices between repeaters.
1,500 m (5,000 ft) twisted pair cable without a repeater
4,500 m (15,000 ft) twisted pair cable from NAE-S and the farthest N2 device (three segments of
1,500 m [5,000 ft] each, separated by repeaters)
Line Length and
Type
2,000 m (6,600 ft) between two fiber modems
Cable
Solid or stranded 1.0 mm (18 AWG) 3-wire is recommended
Solid or stranded 0.5 mm (24 AWG) larger 3-wire or 4-wire (two twisted-pairs) is acceptable
Note:
Use only twisted pair wire. On applications using 4-wire (two twisted-pairs) cable,
isolate and insulate unused conductor.
NAE-S Installation Guide
5
