This board is a PCI bus-compliant interface board for input/output of digital signals. The board is a negative-common typed and insulated digital input/output board and can input and output digital signals at 12 - 24VDC. PIO-32/32H(PCI)H can input and output up to 32 channels. This product uses opto- coupler isolated input (ready to accept current sinking output signals) for input and opto- coupler isolated current sinking output for output. With the Windows version, the Linux version driver (API-PAC(W32)).