Mesa 4I24
Mesa 4I24 72/96 bit parallel I/O cards The MESA 4I24 series of cards are 96 or 72 bit parallel I/O interfaces implemented on the PC/104 bus. The 4I24 uses 4 (4I24, 4I24I) or 3 (4I24M) socketed 82C55 PIO chips to give for a total of 96 I/O bits (4I24, 4I24I) or 72 I/O bits (4I24M). 3.3K Pullup resistors are provided on all ports to simplify interfacing to contact closure, opto-isolators, etc. The 4I24 series includes three models with different I/O connectors. The standard 4I24 uses two 50 pin headers for I/O connections. The 50 pin connectors each have 48 I/O bits, ground, and power. The 4I24I uses four 26 pin headers with ISO standard pinout (24 I/O bits per 26 pin connector, pin 2 = GND, pin 26= 5V). The 4I24M has I/O module rack compatible pinouts with three 50 pin connectors each having 24 I/O bits with interleaved grounds. 5V power on the I/O connectors is fused on the 4I24. All 4I24 models use the 16 bit stack through type PC/104 bus architecture. Four layer circuit card construction is used to minimize radiated EMI and provide optimum ground and power integrity. All CMOS design keeps power consumption to a minimum.
Mesa 4I20
Mesa 4I20 PC/104 card with 24 open drain 350 mA outputs The 4I20 is a stackable PC/104 card with 24 open drain 350 mA outputs for solenoids, valves, relays, motors, incandescent lamps and other medium power DC loads. The 4I20 outputs are galvanically isolated from logic ground to avoid ground loops, as the total ground return current be as much as 8.4 amps. The isolation also allows the 4I20 to drive ground referred loads.
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