Includes sockets for installation of pull-up/pull-down resistors
9-pin, 2.2kOhm SIP resistors (not included with board) may be ordered separately: SP-K2.29C (please call01462 480055 to order)
General Description
The PCI-DIO48H/SIPSCKT is a high density, logic level, digital I/O board for PCI bus compatible computers, offering 48 bits of digital I/O. The board provides the I/O in 24-bit groups based on an 82C55, mode 0 emulation. Each group provides an 8-bit port A and port B, as well as an 8-bit port C that can be split into independent 4-bit port C-HI and a 4-bit port C-LO.
The digital outputs drivers are 74S244 chips and provide 64 mA sink and 15 mA source current capabilities. The input buffers are 74LS373 and offer the high standard input impedance of the 74LS series. On power up and reset, all I/O bits are set to input mode. Like all members of the 74LS series, unconnected inputs will typically float high. If you are using the board to control items that must be OFF on reset, you will need to install pull-down resistors. Provisions have been made on the board to allow users to quickly and easily install SIP resistor networks in either pull-up or pull-down configurations.
The PCI-DIO48H/SIPSCKT is completely plug-and-play. There are no switches or jumpers on the board. All board addresses are set by your computer's plug-and-play software.
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