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2.3 Optional RS-232 Interfaces (COM3~COM4)
UNO-3072A/3074Aoffers two optional RS-232 serial communication
interfaces: COM3 and COM4. Please refer to Appendix A.4 for their pin
assignments. The default of these two COM ports is "Disabled". In order
to use these two COM ports, follow these steps:
1.
Take the DB-9 RS-232 cable (with brackets) from accessory box.
2.
Connect the end of the cable on CN17 and CN18 of the main board.
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Chapter 2
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