Black Box IC174C Address Selection, Binary, Typically COM1=3F8h COM2=2F8h COM3=3E8h COM4=2E8h

DUAL PORT RS-232 SERIAL INTERFACE

3. Address Selection

NOTE

Be sure to set the address selections and jumper options before installation.

Each serial port on the Dual Port RS-232 Serial Interface occupies 8 consecutive I/O locations. A DIP switch is used to set the base address for these locations. Be careful when selecting the base address as some selections conflict with existing PC ports. The following table shows several examples that usually do not cause a conflict. SW1 sets the I/O address for Port 2 (the upper connector), while SW2 sets the address for Port 1 (the lower connector).

Address		Binary			Switch Position Setting
Hex	A9	A0	1	2	3	4	5	6	7
280-287	1010000XXX		OFF	ON	OFF	ON	ON	ON	ON
2A0-2A7	1010100XXX		OFF	ON	OFF	ON	OFF	ON	ON
2E8-2EF	1011101XXX		OFF	ON	OFF	OFF	OFF	ON	OFF
2F8-2FF	1011111XXX		OFF	ON	OFF	OFF	OFF	OFF	OFF
3E8-3EF	1111101XXX		OFF	OFF	OFF	OFF	OFF	ON	OFF
300-307	1100000XXX		OFF	OFF	ON	ON	ON	ON	ON
328-32F	1100101XXX		OFF	OFF	ON	ON	OFF	ON	OFF
3F8-3FF	1111111XXX		OFF	OFF	OFF	OFF	OFF	OFF	OFF

Typically COM1:=3F8h; COM2:=2F8h; COM3:=3E8h; COM4:=2E8h

If you do not see an address in the table that is compatible with your software,

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