Null modem - Wikipedia
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DB9 Female to Female Null Modem Mini Adapter
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DB9 Male to DB9 Female Null Modem Adapter
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RS232 serial null modem cable wiring and tutorial - Lammert Bies
DB9 Male to DB9 Female Serial RS232 Null Modem Adapter | Serial RS232 | Computer Cables | USB and PC
DB25 Male to DB25 Female Serial RS232 Null Modem Adapter | Serial RS232 | Computer Cables | USB and PC
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Null Modem Adapter, DB9 Female to DB9 Female
