©2006 Cypress Computer Systems,Inc. • www.cypressworld.com
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Reader Data Connections:
The diagrams below show data connections for the reader signals. Power and communication
connections are still present, but have been removed from the diagram for clarity.
Control Panel
Reader Port
Card Reader
Central
Unit
Remote Unit
The SPX-1200 has eliminated the need for “Pullup” resistors in most installations.
Dipswitch #4 controls whether the internal pullup resistors are turned on or not.
Dipswitch #4 OFF (Default) Pullup resistors are enabled. Data outputs on the Central unit will
be pulled up to 5 volts.
Dipswitch #4 ON Pullup resistors are disabled. External pullups can be provided to pull up to
a different voltage if necessary. Outputs can be pulled up through a resistor up to 30 volts.
C
