Harman AMX NETLINX NX Series, Hardware Reference Manual

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Wiring and Connections
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Hardware Reference Guide - NX-Series NetLinx Integrated Controllers
Relay Ports
The relay ports (port 21 on the NX-2200/3200/4200) are 8-pin 3.5 mm mini-Phoenix (male) connectors used for connecting
external relay devices. The NX-3200 and NX-4200 each features 2 sets of 8-pin relay connectors. The NX-2200 features one set of
connectors. You can connect up to 8 independent external relay devices on both the NX-3200 and NX-4200 units, and 4 on the
NX-2200. When a relay is "OFF", terminals A and B are open-circuit. When a relay is "ON", terminals A and B are shorted together.
Relay Connections
Use connectors A for common and B for output (FIG. 23). Each relay is isolated and normally open.
A metal connector strip is also provided to common multiple relays.
FIG. 23
RELAY connector (male)

8-channel single-pole single-throw relay ports

Each relay is independently controlled

Supports up to 8 independent external relay devices (4 on the NX-2200)

Channel range = 1-8

Each relay can switch up to 24 VDC or 28 VAC peak @ 1 A

Two 8-pin 3.5mm mini-Phoenix (male) connector provides relay termination (One connector on the NX-2200)
I/O Ports
The I/O ports (port 22 on all NX-series controllers) are 6-pin 3.5 mm mini-Phoenix (male) connectors used for connecting
logic-level outputs. The NX-3200 and NX-4200 each features 2 sets of 6-pin I/O connectors. The I/O port responds to either
switch closures, voltage level (high/low) changes, or it can be used for logic-level outputs. Each port is capable of being used as an
input or an output.
The I/O port detects a low signal (0 - 1.5 VDC) as a PUSH, and a high signal (>1.7 VDC) as a RELEASE. Voltages between 1.5V and
1.7V may be detected as a PUSH or a RELEASE.
FIG. 24 displays the I/O ports for each NX-series controller.
FIG. 24
I/O ports

A contact closure between the GND and an I/O port is detected as a PUSH.

When used for outputs, the I/O port acts as a switch to GND and is rated for 200mA @ 12 VDC.

The NX-1200 and NX-2200 can use up to 4 I/O ports

The NX-3200 and NX-4200 can use up to 8 I/O ports

The PWR pin pr12 VDC @ 200 mA and is designed as a power output for the PCS Power Current Sensors, VSS2
Video Sync Sensors (or equivalent).

The GND connector is a common ground and is shared by all I/O ports. A common ground is shared with I/O ports 1-8
(NX-3200/NX-4200) or with I/O ports 1-4 (NX-1200/NX-2200).

The input impedance on the I/O port is 22k.
NX-3200/4200
NX-2200
NX-3200/4200
NX-2200 NX-1200