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Appendix B – FS-HDR Pinouts
GPI Pinouts
General Purpose Interface Inputs and Outputs are available on the FS-HDR back
panel to provide contact closure control. GPI Inputs can control FS-HDR functions,
while GPI outputs can control external equipment (i.e. alarms).
Figure 40. DB-25F GPI Input and Output Pinout
The GPI inputs and outputs are electrically isolated from power and ground on
the FS-HDR frame. There are four inputs and four outputs. Electrical isolation is
provided for up to four pieces of external equipment.
The following guidelines apply to the four GPI inputs and outputs:
• GPI In 1 and GPI Out 1 share a common isolated ground on pin 24 (GPI GND 1),
• GPI In 2 and GPI Out 2 share a common isolated ground on pin 10 (GPI GND 2).
• GPI In 3 and GPI Out 3 share a common isolated ground on pin 21 (GPI GND 3).
• GPI In 4 and GPI Out 4 share a common isolated ground on pin 7 (GPI GND 4).
• Pin 13, local chassis ground, may only be used as references when isolation is
not required.
• All four GPI inputs are internally pulled high through a 10K ohm resistor to an
isolated +5V supply, so that a relay contact closure or any device sinking at
least 0.4 mA to ground will register a logic low.
• All four GPI outputs are +5V TTL compatible, sourcing up to 6mA and sinking
up to 4mA each.
The following illustration shows typical external wiring to the GPI connector. The
GPI inputs require some kind of contact closure between the input pin and the
input ground pin to register the logic low that triggers the GPI input.
You can connect the outputs to TTL buffers that communicate the GPI output
logic levels to other devices. For example, you could use an opto-isolator
controlling a relay to activate other equipment as shown below.
FS-HDR Frame Synchronizer/Converter/HDR-WCG Processor v1.0r1
Pin
Function
1
NC
2
NC
3
NC
4
NC
5
NC
6
NC
7
GPI GND 4
8
GPI In 4
9
GPI Out 3
10
GPI GND 2
11
GPI In 2
12
GPI Out 1
13
Ground
Pin
Function
14
NC
15
NC
16
NC
17
NC
18
NC
19
NC
20
GPI Out 4
21
GPI GND 3
22
GPI In 3
23
GPI Out 2
24
GPI GND 1
25
GPI In 1
128
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