User Manual

PIO-48 User Manual

Card Setup

The PIO-48 contains several jumper straps for each port that must be set for proper

operation.

Address Selection

The PIO-48 occupies 8 consecutive I/O locations. Dip-switch SW1 sets the

base address for the PIO-48. 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.

Address Binary Switch Settings

1 2 3 4 5 6 7 8

280-287 10 1000 0XXX Off On Off On On On On On

2A0-2A7 10 1010 0XXX Off On Off On Off On On On

2E8-2EF 10 1110 1XXX Off On Off Off Off On Off On

2F8-2FF 10 1111 1XXX Off On Off Off Off Off Off On

3E8-3EF 11 1110 1XXX Off Off Off Off Off On Off Off

300-307 11 0000 0XXX Off Off On On On On On Off

328-32F 11 0010 1XXX Off Off On On Off On Off On

3F8-3FF 11 1111 1XXX Off Off Off Off Off Off Off On

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

Address Selection Table

The following illustration shows the correlation between the DIP-switch setting and

the address bits used to determine the base address. In the example below, address

300 is selected as the base address. Address 300 in binary is 10 0000 XXX where X

= a non-selectable address bit and address bit A9 is always a 1.

DIP-Switch Illustration

Note: Setting the switch ‘On’ or ‘Closed’ corresponds to a ‘0’ in the address, while

leaving it ‘Off’ or ‘Open’ corresponds to a ‘1’.