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© Sealevel Systems, Inc. 3502 Manual | SL9116 9/2022
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
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.
