HD1492 HD Encoder Frame Card
A General-Purpose I/O
Each of the 2 GPIO input banks, Bank A and Bank B, has the following
pinout:
7 8
5 6
3 4
1 2
Bank A provides GPI inputs 1-4:
Input Pins
4 (D) 7, 8
3 (C) 5, 6
2 (B) 3, 4
1 (A) 1, 2
Bank B provides GPI inputs 5-8:
Input Pins
8 (H) 7, 8
7 (G) 5, 6
6 (F) 3, 4
5 (E) 1, 2
A GPI input is activated when closed (connected to ground), and inactive
when open (left floating). The even-numbered pin in a given GPI pair is
its ground. For example, GPI input 1 can be activated by connecting pins
1 and 2 of Bank A, thereby grounding pin 1. If pin 1 were left floating,
GPI input A would be inactive.
A GPI output’s pins form a switch that is on when closed and off when
open. For example, pins 3 and 4 of the GPI output bank form a switch
that is closed when GPI output 2 is active, and open when it is inactive.
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