Network Control Module 300 Series Technical Bulletin 10
Local Bus: N2 (Port 1)
The N2 Bus communications also are provided by a built-in interface
(Figure 1: Callout 6). Devices on the N2 Bus constitute a local
network, controlled by the NCM. The NCM polls the devices
according to a user-set priority level, which is set at each device’s
Definition window.
The N2 connects in a daisy-chain fashion and provides the
transmission medium for modules installed within the base frame
(for example, a Digital Control Module or Point Multiplex Module), as
well as the external devices (application specific controllers including
the AHU, UNT, VAV, VMA, LCP, DX-9100, IFC-1010/IFC-2020
Intelligent Fire Controller, and IAC-600 Intelligent Access Controller).
For information on setting N2 End-of-Line (EOL) switches, see
Setting the N2 End-of-Line Switches in this document.
ISA Bus Cards
The NCM is equipped with two ISA slots. These slots can hold 16 bit
ISA cards (Figure 1: Callouts 4 and 5). These slots allow for the use of
off-the-shelf communication cards (either 8 or 16 bit).
Metasys Release 8.0 and later support the following communication
cards in the NCM ISA slots:
• ARCNET card (Slot 1 only)
• Ethernet card (NCM350 and NCM361 only [Slot 1 only])
• L
ONWORKS® interface card; Slot 2 only (Figure 1: Callout 5)
• Non Plug and Play (PnP) serial cards (if downloading is desired,
use the NCM350 or NCM361)
• Media Interface Board (MIB-OWS) must be placed in Slot 2
(Figure 1: Callout 5) (NU-NCM300-FIRE or NU-NCMFIRE-1)
PnP modems and devices are not compatible with NCMs unless the
PnP feature can be disabled. Most new internal modems are designed
to be PnP compatible. Note that the Information
Technology-Acquisition Services (ITAS) Personal Computer (PC)
price list (pcprices.doc) on The Advisor contains an updated list of
recommended modems. Please check the list prior to purchasing an
internal modem. You can find the list by searching for the file name,
pcprices.doc, on The Advisor.
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