Microsoft UNO-3074 user manual 6 IRQ, I/O Address and Transmission Rate Setting

Table 2.1: Auto Flow & RS-422 Slave/Masters

SW2 DIP Switch Setting	COM Port	Mode Selections
	COM3	RS-422: Slave mode
		RS-485: Auto flow control
	COM4	RS-422: Slave mode
		RS-485: Auto flow control
	COM3	RS-422: Master mode
		RS-485: N/A
	COM4	RS-422: Slave mode
		RS-485: Auto flow control
	COM3	RS-422: Slave mode
		RS-485: Auto flow control
	COM4	RS-422: Master mode
		RS-485: N/A
	COM3	RS-422: Master mode
		RS-485: N/A
	COM4	RS-422: Master mode
		RS-485: N/A

2.3.6IRQ, I/O Address and Transmission Rate Setting

The IRQ and I/O address range of COM3 and COM4 are listed below:

•COM3: 3E8H, IRQ10 (Independent IRQ), IRQ10 (Share IRQ)

•COM4: 2E8H, IRQ5 (Independent IRQ), IRQ10 (Share IRQ)

•Vector address for share IRQ: 1D0H

You can set “Share IRQ” or “Independent IRQ” by the first switch of SW3 (Refer to Table 2.2 below).

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