(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
| | Signal | Polarity | Recommended | Maximum |
| Protocol | | | Recommended |
| | |
| Type | A | B | Cable | Distance from Nortec |
| |
| | | | | | Module |
| | | | | | |
| BACnet | EIA-485, | Net + | Net - | 18-24 AWG | 2300 ft at 9.600 kbps |
| MS/TP | Shielded, Twisted |
| 2-wire | 2000 ft at 38,400 kbps |
| Johnson N2 | | | Pair |
| | | | |
| BACnet/IP | LAN | N/A | N/A | CAT.5E cable with | Depends on cable |
| standard | RJ-45 termination | manufacturer |
| | | |
| LonWorks | EIA-232, | Tx | Rx | 18-24 AWG | Should not exceed 50 ft. |
| 2-wire | | | Twisted Pair | |
| | | | |
(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.
10-10
Page 3 2008-02-18
