16 • Installation
NK-3RD User Guide (v04)
3. Comms Activity LEDs
The Comms activity LEDs light to show serial communication activity. They show the following status:
Device Controls – Rear
Figure 3.2 Rear Panel
1. Power Connector
The supplied power connects here.
2. T-Bus Ports
This is an RJ-45 socket for connecting to the T-Bus. T-Bus is a modified RS-485 serial communications link used
by NK Series devices. Connect to NK Series devices using straight-through CAT5 cables.
There are two T-Bus sockets which are passively connected to create a “loop through” connection.
3. Third-Party Port
This is a female DB9 connector wired for standard RS-485/RS-422 communications. Use this to connect to the
third-party device that will be controlling the system.
Connecting Power
The NK-3RD is powered using the 15V 3.3A power supply provided. This power supply connects directly to the
AC mains supply.
The NK-3RD does not receive nor contribute to power via the T-Bus connector (phantom power).
Table 3.1 Comms Activity LEDs
LED
Monitors
Details
A
Third-Party Rx
Serial data is being received from third-party device.
B
Third-Party Tx
Serial data is being transmitted to third-party device.
C
NK Rx
Serial data is being received from NK Control System.
D
NK Tx
Serial data is being transmitted to NK Control System.
Warning
— Always use the region-specific power supply and cable provided with the equipment.
POWER
T-BUS
Third-Party
RS-422
Interface Port
Summary of Contents for NK-3RD
Page 1: ...NK 3RD User Guide...
Page 8: ...ii Contents NK 3RD User Guide v04...
Page 14: ...14 Overview NK 3RD User Guide v04...
