Advantech PCL-746+, Руководство пользователя

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Chapter 2 Hardware Installation 13
I/O Address and Interrupt Setup
Next you will need to select an IRQ (interrupt request) number and an
I/O base address for the PCL-746+.
Mode Setup (S5)
The cards base address can be setup using S5. Please note that the
first DIP switch is for mode setting as shown below.
Standard Mode
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
Enhanced Mode
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.