Wiring considerations and guidelines
Table 2: Router Ethernet network rules
Category Rules and maximums allowed
General Star topology with network switches
Number of MS/TP devices Maximum of 100 devices at one site in the network. Limited to 32 devices for a
Remote Field Bus.
2,000 m (6,600 ft) for plastic/glass fiber optic with external adapterLine length and type
100 BaseT: 100 m (330 ft) Cat5 or Cat6 cable
10 BaseT: 100 m (330 ft) Cat5 or Cat6 cable
Terminations For 100/10 BaseT
Table 3: Guidelines for BACnet protocol MS/TP network topology
Category Rules and maximums allowed
General RTR1100x model supports one BACnet MS/TP field controller (FC) trunk
Field controller trunks are wired with a daisy chain topology only.
Number of devices 100 devices per FC Bus with no more than two repeaters between any device and a
maximum of 50 devices between repeaters; one FC Bus model does not support the
N2 Bus trunk. Limited to 32 devices for a Remote Field Bus.
1,500 m (5,000 ft) cable without a repeater
4,500 m (15,000 ft) cable from the device 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
Use a 6 mm (0.250 in.) wire strip
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 infor-
mation.
Terminations FC devices with EOL switch in the ON position, one at each end of each FC Bus
segment
Technical specifications
Table 4: JC-RTR11002-0 BACnet Router technical specification
Specification Description
Power requirement Dedicated nominal 24 VAC, Class 2 power supply (North America), SELV power
supply (Europe), at 50/60 Hz (20 VAC minimum to 30 VAC maximum)
Alternate: Dedicated nominal 24 VDC, Class II power supply input; North
America: ACC-PWRKIT-1A24; Europe: ACC-PWRKIT-1E24
Power consumption 38 VA maximum
Operating system Wind River® Linux LTS 19 (LTS: long-term support)
Processor NXP i.MX6 DualLite processor, dual core Cortex-A9 processor at 1.0 GHz with
512 KB of L2 cache
Memory 16 GB flash nonvolatile memory for operating system, configuration data, and
operations data storage and backup
2 GB SDRAM for operations data dynamic memory
Supported integrations BACnet/IP, BACnet MS/TP
JC-RTR11002-0 BACnet Router Installation Guide10
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