OPTO32I32PCI-I (ICPDAS - PISO-P32S32WU) has 32 channels of optical-isolated DI and 32 channels of optical-isolated open-collector output board (8-channel for 500 mA and 24-channel for 100 mA current sinking output, NPN), arranged into four isolated banks. Each input channel use a photo-coupler to isolate the card and computer from external signal. Each digital output offers a NPN transistor and integral suppression diode for inductive load. OPTO32I32PCI-I requires external power to drive the D/I and D/O ports and supports Card ID (jumper) features for multi-board identification and supports both 5 V and 3.3 V PCI slot.