Impulse SIO-104+2 (3502) - Manual (Page 4)

Card Setup
Sealevel Systems SIO-104+2 Page 2
Card Setup
The SIO-104+2 contains two DIP-Switches and a jumper strap for each port, which must be set for proper
operation.
Switches SW1A and SW2A
Address Selection
Each port on the SIO-104+2 occupies eight consecutive I/O locations. A DIP-switch is used to set the base address
for these locations. SW1A sets the I/O address for port 1 and SW2A sets port 2. The following table shows the
addressing options available. If different address options are required, please contact Sealevel Systems Technical
Support about a custom PAL option.
1 2 3
3F8 On On On
2F8 On On Off
3E8 On Off On
2E8 On Off Off
2A0 Off On On
300 Off On Off
328 Off Off On
Disabled Off Off Off
Figure 1 - Address Selection Table
Note: Each COM: port in the system should have a unique address. Typically COM1: - COM4: addresses are 3F8,
2F8, 3E8 and 2E8 Hex.
Refer to Appendix A for common address contentions.
Port Enable / Disable
Each port on the SIO-104+2 can be enabled or disabled by setting the three switches in the ‘Off’ position. The port
is enabled when a valid I/O selection is made. If any port is disabled, be sure to disable the interrupt request for that
port by removing the IRQ jumper.