The CNT24-4(PCI)H is a PCI bus-compliant interface board that counts input pulse signals from external devices. The CNT24-4(PCI)H has four channels of 24-bit up/down counters, allowing external devices such as a rotary encoder and a linear scale to be connected. The pulse signal inputting interface is photo coupler isolated or TTL-level input. Furthermore, this board is exchangeable within the system already built for the product with the compatibility of the higher rank of CNT24-4(PCI) currently made from CONTEC. With the Windows version, the Linux version driver (API-PAC(W32)).