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Next you will need to select an IRQ (interrupt request) number and an
I/O base address for the PCL-746+.
The cards base address can be setup using S5. Please note that the
first DIP switch is for mode setting as shown below.
In this mode each of the four ports can be setup as the address or the
IRQ channel individually.
Port1
CH1 Base Address AAA, CH1 IRQ M
Port2
CH2 Base Address BBB, CH2 IRQ N
Port3
CH3 Base Address CCC, CH3 IRQ O
Port4
CH4 Base Address DDD, CH4 IRQ P
In this mode all four ports share the same IRQ and continue to use the
cards designated IRQ address. This mode also utilizes an interrupt
status register designed to indicate which serial port has generated an
interrupt. This speeds up interrupt processing resulting in a greater
throughput for each multi-port card.
Chapter 2
Hardware Installation
13
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