Owner manual

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”.