Nortec Industries NHTC Series - Manual (Page 10)

10-10
Page 3
2008-02-18
(2) WIRING
(A) BACNET/MSTP, JOHNSON N2, AND LONWORKS
(1) The necessary internal wiring for the Gateway is already present except for the BMS
network connection that can be made via twisted-pair at terminals A and B. To
network multiple units to a single Gateway, the units may be daisy-chained to each
other using the network link terminals at the TB3 connection jack on the humidifier
logic board. Refer to wiring diagram in section 10-50.
(1) Table #1 refers to the recommended wire types and maximum recommended
lengths from the Nortec LINK 2 module to the front-end of the Building Management
system. Since communication between the humidifiers and Nortec Links will always
occur via a EIA-485 signal type, Nortec recommends using a 18-24 AWG shielded,
twisted pair wire between the lead humidifier and each of the slave humidifiers.
Cable runs between the Nortec LINKS 2 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 1. Recommended Wire Types and Lengths
Polarity
Protocol
Signal
Type
A B
Recommended
Cable
Maximum
Recommended
Distance from Nortec
Module
BACnet
MS/TP
Johnson N2
EIA-485,
2-wire
Net + Net -
18-24 AWG
Shielded, Twisted
Pair
2300 ft at 9.600 kbps
2000 ft at 38,400 kbps
BACnet/IP
LAN
standard
N/A N/A
CAT.5E cable with
RJ-45 termination
Depends on cable
manufacturer
LonWorks
EIA-232,
2-wire
Tx Rx 18-24 AWG
Twisted Pair
Should not exceed 50 ft.
(B) BACNET/IP
(1) The necessary wiring for the Gateway is present except for the network cable,
which must be connected to the RJ-45 (Ethernet) jack on the Gateway. Refer to
wiring diagram in section 10-50.