HLC Flashcards
The HLC can be modified to perform different functions by changing the firmware E-Proms and adding
Modules
When the HLC receives a code a message is decoded by the
Auxiliary communications power
Once the message has been decoded it is routed to the correct output by the
Application software
The site specific module is the module that stores the memory for that particular signal location The memory is contained in the
EProms
The procedure that has to be done before the unit can function in the traffic control system is called
Set up
When you are using the CDU the right arrow button is used to move right on the menu or
Increase values
A dimly lit LED on the power supply board could indicate
Low battery voltage
The position of the ejector handles on a circuit board indicate whether or not the
Board is fully plugged into the unit
The current configuration of the LC refers to
The settings that are presently programmed into the memory
The purpose of the Harmon logic controller HLC is to
Be the communication link between the dispatchers office and the field location
The RS-232 code line interface board has four LED’s. If none of these four lights are illuminated or blinking, which of the following is not a possible defect?
A Non-Vital Logic I/O module is in the wrong slot.
Which module serves as the interface between the external device code line code machine etc and the HLC unit
The RS-232
Each board on the HLC unit have a green help LED if the LED on any module is not fit you should
Replace the module
There are two ways to set up a Harman logic controller One is by using a computer the other is
By using the CDU control display unit
Select the terminal that is used to monitor a hand throw switch east of the location
Aux +1N or - IN terminals
