Advantech ISA bus data acquisition and control card | digital input and output PCL-725 Products pcl-725 is a Isolated Digital Input / Output half-length card that provides eight electromechanical relay outputs and eight spdt Digital outputs with optical isolation. The card-board relay spdt especially for distinguished community / off control or low supply voltage switching. No relays come with a red led lights, used to display the on / off status of the relay in order to detect. 8 digital input channels pcl-725 with optical isolation, can work in a noisy environment or drift voltage situation. You can line settings for each channel individually input channel is isolated. Onboard a db-37 interface for connecting communication cables. 8 digital input channels pcl-725 with optical isolation, can work in a noisy environment or drift voltage situations. You can line settings for each channel individually input channel is isolated. Onboard a db-37 interface for connecting communication cables. Features PC AT / ISA bus 4 SPDT (Class C) and 4-pole, single-throw (A class) relays are non-latching relay board LED display board relay driver circuit relay state relay output status read back 8 isolated onboard lowpass filter fttilslli digital inputs for digital input