10
Operation
Once configured, programmed and powered up, the controller requires very
little user intervention.
Controls and Indicators
The following sections describe the controls and indicators found on the
controller.
Network ON/OFF
The network ON/OFF switch is located near the RJ–12 connector. Use this switch
to enable or disable the RS-485 network connection. When the switch is ON the
controller can communicate on the network; when it is OFF, the controller is
isolated from the network.
Alternately, you may remove the Isolation Lamps to isolate the controller from
the network.
Status LEDs
Two Status LEDs are located on the left side of the controller above the power
connector terminal. They are used to indicate the following:
Ready
– This LED flashes rapidly whenever the controller is operating normally.
You can consider this the same as a power LED.
Communications
– This LED indicates when the controller is transmitting over
the RS-485 network connection.
Isolation Lamps
Two Isolation Lamps are located near the RJ–11 connector. These lamps serve
three functions:
◆
Removing the lamps will open the RS-485 circuit and isolate the controller
from the network.
◆
If one, or both, lamps are lit, it indicates the network is improperly phased.
This means that the ground potential of the controller is not the same as other
controllers on the network
◆
If the voltage or current on the network exceeds safe levels, the lamps operate
as fuses and may protect the controller from damage.
