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© Sealevel Systems, Inc.
4030 Manual | SL9362 9/2021
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
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
Setting the switch ‘On’ or ‘Closed’ corresponds to a ‘0’ in the address, while leaving it ‘Off’ or
‘Open’ corresponds to a ‘1’.
