Omega Vehicle Security ISA RS-422 - Manual (Page 17)

Appendix A - Troubleshooting
OMG-ULTRA-SIO Page 13
8. The following are known I/O conflicts:
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The 278 and 378 settings may conflict with your printer I/O adapter.
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3B0 cannot be used if a Monochrome adapter is installed.
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3F8-3FF is typically reserved for COM1:
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2F8-2FF is typically reserved for COM2:
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3E8-3EF is typically reserved for COM3:
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2E8-2EF is typically reserved for COM4: