Nortec OnLine GSTC - Manual (Page 7)

Installation | 3
The necessary internal wiring for the gateway is already present except for the network
connection that can be made internally to the unit. 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, see Figure 3.
Figure 3: Connecting Multiple Humidifiers to a Lead Humidifier –
2008 Models and Older
Table 1 refers to the recommended wire types and maximum recommended lengths from the
NORTEC OnLine module in the lead unit. Since communication between the humidifiers and
NORTEC OnLine will always occur via a EIA-485 signal type, NORTEC recommends using 18-24
AWG shielded (120 Ω impedance), twisted pair wire between the lead humidifier and each of
the secondary humidifiers. Cable runs between the NORTEC OnLine module and the furthest
“slave” humidifier should not exceed 2,600 feet. Signal boosters or repeaters may be necessary
for longer wire runs. The shield wire(s) should be connected at one end only.
The NORTEC OnLine module has been designed and tested to operate with a variety of third-
party manufacturers equipment that promote wireless connectivity. Should a user desire to
connect the OnLine module to the internet via a wireless connection such as 802.11b or g class
network, NORTEC can provide recommendations on which equipment to use.