Nortec LINKS XPS MH - Manual (Page 21)

Links XPS for MHTC | 18
Wiring
BACnet MS/TP, Johnson N2, and LonWorks
Links XPS is pre-installed and factory wired. Connections must be made between the master
humidifier and the BMS, and the master humidifier and any slaves that may be present.
Up to 8 units (1 master, 7 slaves) may be connected to a BMS through a single gateway in the
master unit. The units are daisy chained via the Links XPS terminal strip. The wire shield
should only be connected at one end per pair of units when “daisy chaining”.
Table 2 refers to the recommended wire types and maximum recommended lengths from the
Nortec Links XPS module to the Building Management system. Communication between the
humidifiers and Nortec Links XPS will occur via a EIA-485 signal type. Nortec recommends using
a 18-24 AWG shielded, 120
 twisted pair wire between the lead humidifier and each of the
slave humidifiers. Total cable length runs between the Nortec Links XPS module and the
furthest slave humidifier should not exceed 2,000 feet. Signal boosters or repeaters may be
necessary for longer wire runs or where electrical noise interference is prevalent.
Table 2: Recommended Wire Types and Lengths
Protocol
Signal
Type
Polarity
Recommended
Cable
Maximum
Recommended Distance
from Nortec Module
A B
BACnet MS/TP
EIA-485,
2-wire
Net + Net -
18-24 AWG
Shielded, Twisted
Pair
120  Impedance
2300 ft at 9.6 kbps
2000 ft at 38.4 kbps Johnson N2
LonWorks
FTT-10, 2-
wire
Tx Rx
18-24 AWG
Twisted Pair
120  Impedance
Should not exceed 50 ft.
BACnet/IP
LAN
standard
N/A N/A
CAT.5E cable with
RJ-45 termination Depends on cable
manufacturer