What physical/hardware interface is provided for contact closure / logic voltage I/O?
The 9088 and 9000ii hub provides 8 control inputs. Each control input is as-signed to an ADC channel, has a 4.7 k pull-up resistor, and accepts a voltage be-tween 0 and 5V. You can connect a switch between the signal pin and common and use the port as a simple contact closure input, or you can use a potentiometer (which must be 47k logarithmic) and use it as a continuous parameter control. The software allows you to configure the control inputs for each 9088/9000ii. The 9088/9000ii also provides 8 logic outputs, which can drive either 0 or 5V, protected by a 440 Ohm series resistor. They can be used to drive LEDs or possibly relays. An additional logic output is opto-isolated, and coupled directly to the watchdog output. This will energise when the system is up and running OK; if power fails, or if the software crashes, the opto-isolator will stop conducting. The connections to all these inputs and outputs are provided on a two-level 24 way Phoenix connector.
