GPIO PCI 6503

[mqayyum]

Hi Everyone,

I recently bought a system that has GPIO PCI 6503 Card installed and PA0 port is configured for an alarm unit (24 static digital IO l/ines n(on-isolated 5 V TTL/CMOS) in 8-bit ports, 2.4mA).

I am trying to use solid state relay to get an output as GREEN LED in case normal operation and RED LED in case a fault or failure reported by GPIO card but it is not working at all. I understand that GPIO card has TTL/CMOS as output and SSR relay should work with it. Am I doing something wrong.

Kindly advise. 

[crossrulz]

You have an issue with current.  The SSR wants 7.5mA of input current, but the PCI-6503 can only output 2.4mA.  So you need some kind of buffer circuit to increase your current capability. There are plenty of chips out there specifically for this purpose.

[mqayyum]

Thank you for your quick response.  Would you kindly name or advise any circuitry that can solve this problem.

Best regards

[crossrulz]

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@mqayyum wrote:

Would you kindly name or advise any circuitry that can solve this problem.

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Just go to Digikey and do a search for Digital Buffer or Digital Transceiver.  There should be lots of options for you.