Contec digital input and output interfaces

Input interface

Output interface

These circuits map 32 electrically isolated, bipolar CMOS-compatible input or output channels to a Contec PIO-64/64L(PCI)H digital I/O card. The circuits are intended to be housed within GEO-600 style cassettes, and the channels are intended to be routed to each enclosure’s front panel using 8 x D-sub 9 connectors each containing 4 digital input or output channels. Each channel may be used for independent applications without special grounding considerations.

The Contec card channels should be connected to the enclosure via a Contec PCB100WS distribution cable. Either the ‘CNA’ or ‘CNB’ D-sub 37 connectors on the PCB100WS may be used, but the HDRA-E100MA1 connector must be inserted into the PIO-64/64L(PCI)H card's ‘CNA’ (input) interface when using the input circuit, and the CNB (output) interface when using the output circuit.

The input circuit uses 4 of the digital I/O card’s input ports (out of a total of 8); each port provides 8 input channels to the circuit. The output circuit powers 4 of the digital I/O card’s output ports (out of a total of 8); each port provides 8 output channels to the circuit.

The ports in both circuits are recieved on the board via a 40-way IDC header, intended to connect via ribbon cable to a female D-sub 37 connector on the front panel. The channels are routed via optocouplers to 10-way IDC headers intended to connect via ribbon cables to D-sub 9 connectors on the front panel.

Channel switching time is approximately 1 ms, dominated by the IXYS CPC1017N optocouplers. A voltage greater than 3 VDC across each differential input is considered HIGH, whereas a voltage below 2 VDC is considered LOW.

The current through each digital output circuit should not exceed ±100 mA continuous ( ±350 mA peak).

An LED may be attached to the board to indicate the presence of the +15 VDC rail.