PC Board Quick References
6-53
HC-UIO-2 Universal Input/Output Board
Depending upon the software installed, HC-UIO boards may be used for programmable inputs
and outputs (16 per board), car and hall calls, door operator interface, or dispatching. In addi-
tion to being backwards compatible with the HC-UIO board, the HC-UIO-2 also contains the
following enhancements:
1. On-board pull-up resistors can be used by installing the jumpers JP2 through JP17 in
the I/O position. This will eliminate glowing of some LED fixtures when they are off.
The PS1 and PS2 terminals allow different voltages to be used.
2. Different circuitry allows button presses to be detected even when long wires or
corroded button contacts are used.
3. Output short circuit protection is improved, reducing the need for board replacement.
If PS1 or PS2 is connected to 120V, 120V may also be present across the large resistors on
the board and on jumpers JP2 through JP17! The resistors may also be physically hot. Use
caution.
Figure 6.6 HC-UIO-2 Board
PS1 and PS2 are independent (hot lead only) supply inputs for the large pull-up resistors
when the associated jumper (JP2 - JP17) is in the I/O position. PS1 supplies I/O 1 - I/O 8.
PS2 supplies I/O 9 through I/O16.
JP1, CAN Termination
JP18, Voltage Reference. A=External, B=24VDC (Internal)
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