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When connecting to program the EZtrol 250 with a standard DB9 Cable into RS-232-2
When connecting to devices on either RS-232-1 or RS-232-2 with a standard DB9 Cable
When connecting to devices on either RS-232-1 or RS-232-2 with a null modem DB9 Cable
When connecting to RS-232-1 with a standard DB9 cable and connecting to RS-232-2 with a
null modem DB9 cable
When connecting to RS-232-1 with a null modem DB9 cable and connecting to RS-232-2 with
a standard DB9 cable