Rs-232 – Black Box IC187C User Manual
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2-PORT RS-232/422/485 PCI HOST ADAPTER
3.4 Electrical Interface Selection
Each port on the Adapter has the ability to be used in either RS-232 or
RS-422/485 mode. This is selectable via four 24 pin DIP-shunts at E1-E4. Please
use the following illustration to aid in the configuration of your electrical interface.
Figure 3-7. Headers E1 through E4, which control electrical-interface
selection.
E1
E2
RS-232
RS-422
Port 1
E3
E4
RS-232
RS-422
Port 2
RS-232
RS-232
RS-422
RS-232
RS-422
RS-422/485
E1
E2
RS-232
RS-422
Port 1
E3
E4
RS-232
RS-422
Port 2
RS-232 and RS-422/485
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