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4
Configuring the Mini-Matrix for Operation
4.1 Mini-Matrix Configuration
The ‘brain’ inside Dow-Key Matrices, referred to as the “Mini-Matrix Controller”,
has been designed to be as generic as possible in regards to how many
switches it may control. Therefore, the Mini-Matrix must first be informed as to
the set of switches it will control before it can operate. This information must be
updated as switches are added to or taken from the Mini-Matrix. The
knowledge of what switches are to be controlled and how many positions each
of those switches have is known as the Mini-Matrix
’s Configuration Data.
In addition to switch information, the Mini-Matrix Configuration also contains
other information such as the unit’s Serial Number, Model Name, etc. This
information must remain intact for the Mini-Matrix to operate properly.
The Mini-Matrix configuration is already performed at the factory and does not
need to be done by the user unless the Mini-Matrix Controller board has been
replaced, or switches have been added to or taken from the Mini-Matrix.
4.2 Dow-Key GPIO switches
The maximum number of switches used in a Mini-Matrix is limited by the
number of GPIO pins and connectors available on the main controller PCB
(Printed Circuit Board). There are connections for up to 8 SPDT latching
switches, and connections for up to 2 SP6T latching switches. It is important to
note that only latching switches will work in the Mini-Matrix. The Mini-Matrix
controller does not provide a constant current to the switch, so a failsafe or a
normally open switch will not maintain its position after the initial command. For
this reason there are only a few types of switches recommended for use in this
Mini-Matrix, and they are listed below.
TSPDT R521K-420853A (Terminated)
SPDT R401K-420852A (Not Terminated)
SP6T R461JK-420853 (Terminated)
Note: All of the switches in the Mini-Matrix are latching switches. The only
switches the user should add are the switches listed above, which are all
latching switches. For additional information about adding a switch read
Section 4.3.
