User's Manual

DUAL PORT RS-232 SERIAL INTERFACE

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,

3. Address Selection