Johnson Controls NIE39 Installation Instructions Manual page 10

3. For a single KNX line, wire from the red and black terminals on the gateway to the devices. For multiple KNX
lines, wire from the red and black terminals on each gateway to the devices on the same KNX line.
Note: Specific cabling can vary depending on the topology and site. See
Network Integrations.
4. Wire each KNX gateway to its own dedicated power supply on the KNX line.
Wiring Rules and Guidelines for Network Integrations
Table 1: MS/TP Bus Rules
Category
General
Number of FC Devices
Supported
Bus Length
NIE39/NIE49 Installation Instructions
Figure 11: KNX/IP Interface Router
Rules and Maximums Allowed
One MS/TP Bus trunk supported per NIE (on NIE391x-x and NIE491x-x models only)
Only daisy-chained MS/TP devices
MS-NIE491x-x models support up to 100
two repeaters between an NIE49 and any device and a maximum of 50 devices between repeaters.
MS-NIE391x-x models support up to 50
two repeaters between an NIE39 and any device and a maximum of 50 devices between repeaters.
1,500 m (5,000 ft) cable per bus segment without a repeater
4,500 m (15,000 ft) cable from NIE 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
Wiring Rules and Guidelines for
1
MS/TP devices total on the FC Bus with no more than
1
MS/TP devices total on the FC Bus with no more than
10