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Card setup – Impulse 3420 User Manual

Page 6

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Card

Setup

Sealevel Systems COMM+8 Page

3

Card Setup

The COMM+8 contains several jumper straps that must be set for proper
operation.

Address Selection

The COMM+8 occupies 64 I/O locations and can be addressed two
different ways. If header E11 is set to the “Switch” position the COMM+8
occupies 64 consecutive I/O locations and the DIP-switch is used to set the
base address for these locations. The starting address for these 64 I/O
locations must be on a 64-byte boundary i.e.: Hex 200, 240, 280, or 2C0.
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. Refer to Appendix A for common address
contentions.

Address

Switch Position Setting:

1 2 3 4 5 6 7

100-13F

On On On On Off On On

180-1BF

On On On On Off Off On

240-27F

On On On Off On On Off

280-2BF

On On On Off On Off On

2C0-2FF

On On On Off On Off Off

300-3FF

On On On Off Off On On

500-53F

On On Off On Off On On

580-5BF

On On Off On Off Off On

1500-153F Off On Off On Off On On
1580-15BF Off On Off On Off Off On

Figure 1 - 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 280 (Factory Default) is selected as a base.

ON

OFF

1 2 3 4 5 6 7

A12

A6

Figure 2 - DIP-switch Illustration

Note: Setting the switch “On” or “Closed” corresponds to a “0” in the

address, while leaving it “Off” or “Open” corresponds to a “1”.