MultiCam Boards Documentation > GRABLINK series Documentation > GRABLINK DualBase Handbook > I/O Ports Electrical Specifications > Isolated Current-Sense Inputs

Isolated Current-Sense Inputs

Characteristics

Isolated current-sense inputs (simplified schematic)

Input current vs. input voltage

The isolated current-sense input ports have the following characteristics:

The state of the port is reported through the InputState MultiCam parameter.

Compatible Drivers

The following drivers are compatible with the isolated current-sense inputs:

Electrical Circuits Examples

3V3 or 5V Logic Drivers

The following figure shows the wiring diagram for a system device using totem-pole (or open-collector) 3.3V low-voltage TTL, 5V TTL, or 5V CMOS drivers. With this circuit diagram, the highest transistor of the totem-pole driver is useless.

The following figure shows the wiring diagram for a system device using totem-pole (or open-emittor) 3.3V low-voltage TTL, 5V TTL, or 5V CMOS drivers. With this circuit diagram, the lowest transistor of the totem-pole driver is useless.

The following figure shows an alternate wiring diagram for a system device using RS-422 differential drivers. This alternate solution has to be used when no more high-speed differential input ports are available and when the pulse width of the transmitted signals exceeds or equal 5 microseconds:

12V or 24V Logic Drivers

The following figure shows the wiring diagram for a system device using totem-pole (or open-collector) 12V, or 24V CMOS drivers. With this circuit diagram, the highest transistor of the totem-pole driver is useless.

The following figure shows the wiring diagram for a system device using totem-pole (or open-emittor) 12V, or 24V CMOS drivers. With this circuit diagram, the lowest transistor of the totem-pole driver is useless.

Notes

For the two above circuits:

Potential-Free Contacts

The following figure shows the wiring diagram for a system device using potential-free contacts. In this circuit, the current is supplied by the board.