Configuring the base address and IRQ settings on your Sealevel 3420 8-Port Serial Interface is essential for proper function and avoiding conflicts. Here's how to do it:
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Base Address Configuration:
- The base address is set via header E11. You can choose either the "Switch" or "PAL" position.
- Switch Position: The DIP-switch settings determine the base address. Ensure the starting address is on a 64-byte boundary, such as Hex 200, 240, 280, or 2C0.
- PAL Position: This allows a custom address location. Contact Sealevel Systems Technical Support for assistance with the "PAL" option.
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IRQ Selection:
- Each port has an interrupt jumper you may need to set, which depends on the software.
- Select the header for the desired port (E1-E8 for Ports 1-8) and place a jumper on the appropriate IRQ number.
- Consult your software manual to determine the correct IRQ setting. DOS serial port software may not need interrupts. Multi-User Operating Systems may require them.
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Interrupt Mode Options:
- The COMM+8 offers three interrupt modes: Normal (N), Shared (S), and Shared with Resistor (M).
- Set jumpers to "S" for shared interrupt mode on all blocks sharing an IRQ except one. Set that port block to "M" to include a pull-down resistor.
- Refer to your software documentation for specific IRQ selection and configuration details.
By following these steps, and consulting the Sealevel 3420 8-Port Serial Interface user manual, you can successfully configure the base address and IRQ settings for optimal performance.
