Nortec LINKS 2 GSTC - Manual (Page 13)

Installation | 9
Wiring
BACnet MS/TP, Johnson N2, and LonWorks
Links2 is pre-installed and factory wired, except for the SETC-050 which is provided in its own
separate enclosure. Connections must be made between the master humidifier and the Building
Management System (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 / Online terminal strip. The wire shield
should only be connected at one end per pair of units when “daisy chaining”. Older A and B style
units use a different connection method, please refer to revision C of this manual.
Table 2 refers to the recommended wire types and maximum recommended lengths from the
Nortec Links2 module to the front-end of the Building Management System. Since communication
between the humidifiers and Nortec Links 2 occurs 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 Links2 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
2000 ft at 9,600 bps
2000 ft at 38,400 kbps
Johnson N2
BACnet/IP LAN standard N/A N/A
CAT.5E cable with RJ-
45 termination
Depends on cable
manufacturer
LonWorks
FTT-10,
2-wire
Tx Rx
18-24 AWG
Twisted Pair
Should not exceed 50 ft.
BACnet/IP
A standard CAT-5E cable with an RJ-45 ethernet jack is to be connected to port 3,4, or 5 on the
gateway. Refer to wiring diagrams in this manual.