11 of 15
Radar Speed Sign Operation Manual_MN0036 v23.01
Appendix A | Relay Switch Option
Overview
The interface board on the TC
-
800 | TC
-
1100 allows users to connect the radar speed sign to external devices.
The interface board has two relay outputs (connectors shown in green) and one input (connector shown in blue).
The
relay outputs
can be used to power or trigger external devices. The
input trigger
can be used to change the
sign
’
s display configuration based on the presence or absence of an external signal.
Input Trigger
The interface board has an input which will change the radar speed sign
’
s configuration
based on external input. The input is universal and can be triggered by applying any voltage
from 12 VDC –
120
VAC across the input screw terminals. The input trigger latches on for
two seconds, which allows flashing beacon lamps to be used to trigger an input event. As
long as the input sees a voltage above 12V at least once every two seconds, the trigger will
remain active. When using the input trigger with DC sources, polarity is important so ensure
the positive wire leads to the screw terminal marked with a (+). When using the input trigger
with an AC device, polarity does not matter.
To use the trigger input, first set up the trigger configuration by clicking the
Trigger
link at the bottom of the
HOME
configuration screen.
This link leads to a configuration page nearly identical to the
HOME
configuration page. Set the trigger configuration as desired. Then click
Set Config
and
Return Home
to return to the
HOME
configuration page.
Relay
Input
Relay
Outputs
T
o
CP
U
✓
HOME
configuration page
