The ISO-COMBO Card uses not only the 8 Way onboard Green industrial connector but also has 19mm stand-off pin headers lifing the card off the main board to allow extra IO connectivity

The opto inputs use a TLP280GB opto isolator with 6K8 input resistors and can take AC/DC inputs between 5-40V. The connector also provides a 15mA 5V supply to allow external devices to be powered or to power relay contact inputs

The digital ouputs use signal relays 1A@24VDC with Normally Open contacts.

The ADC inputs are designed to read 4-20mA current loop sensors via 100R 0.1% resistor shunts

8 Way On board 3.5mm Connector - ADC Input

Left to right

1 - CH4+
2 - CH4-
3 - CH3+
4 - CH3-
5 - CH2+
6 - CH2-
7 - CH1+
8 - CH3-

J3 Left Hand 10 Way 3.5mm Connector - Digital Input

Left to right

1 - DIGIN0-A
2 - DIGIN0-B
3 - DIGIN1-A
4 - DIGIN1-B
5 - DIGIN2-A
6 - DIGIN2-B
7 - DIGIN3-A
8 - DIGIN3-B
9 - ISO-5V-OUT
10 - ISO-GND-OUT

J4 Right Hand 8 Way 3.81mm Connector - Relay Outputs

Left to right

1 - DIGOUT0-A
2 - DIGOUT0-B
3 - DIGOUT1-A
4 - DIGOUT1-B
5 - DIGOUT2-A
6 - DIGOUT2-B
7 - DIGOUT3-A
8 - DIGOUT3-B