Black Box IC187C, IC133C-R2 manual RS-232 and RS-422/485, Electrical Interface Selection

2-PORT RS-232/422/485 PCI HOST ADAPTER

3.4 Electrical Interface Selection

Each port on the Adapter has the ability to be used in either RS-232 or RS-422/485 mode. This is selectable via four 24 pin DIP-shunts at E1-E4. Please use the following illustration to aid in the configuration of your electrical interface.

RS-422 RS-232 RS-422 RS-232

		E1	232-
					RS
1
		Port	422
		E2
			-
					RS
		E3	-232
					RS
2
		Port	422
		E4
			-
					RS
	RS-232				RS-422/485
-232					E1
		RS
				1
422					Port
-					E2
		RS
-232					E3
		RS
			2
422					Port
					E4
-
		RS

RS-232 and RS-422/485

Figure 3-7. Headers E1 through E4, which control electrical-interface

selection.

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