Wiring Considerations and Guidelines for Network Integrations
Table 1: NAE Ethernet Network Rules
Rules/Maximums Allowed
Category
Star topology with network hubs/switches
General
Maximum of 100 devices can be connected to one site in the Metasys network.
Number of Devices
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 cable
1000 BaseT: 100 m (330 ft) CAT5E cable
For 10/100/1000 BaseT, no line terminators allowed.
Terminations
1 Refer to the
N1 Ethernet/IP Network Technical Bulletin (LIT-6360175)
for recommended parts and part numbers.
Table 2: Guidelines for BACnet Protocol MS/TP Network Topology
Rules/Maximums Allowed
Category
MS-NAE55xx-x models (only) support up to two MS/TP Bus trunks, daisy chain topology only.
General
100
devices per Field Controller (FC) Bus with no more than two repeaters between NAE55 and
any device and a maximum of 50 devices between repeaters
Number of Devices
1,500 m (5,000 ft)
cable without a repeater
Line Length and Type
4,500 m (15,000 ft) cable from NAE55 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
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.
Cable Type
Two FC devices with End-of-Line (EOL) switches in the ON position, one at each end of each FC
Bus segment
Terminations
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 3: Guidelines for N2 Network Topology
Rules/Maximums Allowed
Category
MS-NAE55xx-x models (only) support up to two N2 Bus trunks.
General
Only daisy-chained N2 devices (with maximum stub length of 3 m [10 ft] to any device)
MS-NAE551x-x models (only) support up to 100 N2 devices per N2 Bus, with no more than two repeaters
between NAE55 and any N2 device and a maximum of 50 devices between repeaters.
Number of Devices
1,500 m (5,000 ft) twisted pair cable without a repeater
Line Length and Type
4,500 m (15,000 ft) twisted pair cable from NAE55 and the farthest N2 device (three segments of 1,500
m [5,000 ft] each, separated by repeaters)
2,000 m (6,600 ft) between two fiber modems
7
NAE55/NIE55 Installation Instructions
