Affected Products

Problem | Symptoms

The open collector outputs on the Core 510i do not function correctly. When turned off, the output continues to sink current, driving a load attached to the output pin. Additionally, the output operation appears to be inverted.

Causes | Verification

Current Flow Issue: When the output is off, the open collector pin should float, allowing the voltage to rise to the supply voltage. However, it does not, indicating current flow through the GPIO circuitry to GND, which is enough to turn on a connected relay.

Inverted Outputs: When the open collector output is on, the voltage should read approximately zero, but it does not. When turned off, the voltage should float to the supply voltage but instead reads 0V.

Solution | Workaround

Open Collector Issue:

For devices that require a 12V supply, please use the High Drive, High Current Option. Connect the device between the GPIO pin and 0V, and set the GPIO output to "high drive, high current."

If your device needs a different voltage, utilize the built-in relays to power the device accordingly.

Inverted Controls:

If you encounter inverted controls, simply add a logic-NOT gate just before the GPIO output pin. This will invert the signal and ensure the correct logic is applied.