Card Setup
Card Setup
The OMG-ULTRA-SIOcontains several jumper straps that must be set for proper operation.
Address Selection
Each port on the OMG-ULTRA-SIOoccupies eight consecutive I/O locations. A DIP-switch is used to set the base addres s for these locations. SW1 sets the I/O address for port 1 and SW2 sets port 2. The following table shows the addressing options available. If different address options are required, please contact Technical Support about a custom PAL option.
| 1 | 2 | 3 | 4 |
3F8 | On | On | On | On |
2F8 | On | On | Off | On |
3E8 | On | Off | On | On |
2E8 | On | Off | Off | On |
2A0 | Off | On | On | On |
300 | Off | On | Off | On |
328 | Off | Off | On | On |
Disabled | Off | 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 OMG-ULTRA-SIOcan be enabled or disabled with switch position 4 on the DIP-switch. The port is enabled with the switch ‘On’ and disabled when ‘Off’. If any port is disabled, be sure to disable the interrupt request for that port by removing the IRQ jumper.