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The RS232 Standard
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RS232 cable information
What is a DB9 connector - Signalorigin Precision Connector Co., Ltd.
CC312-20 - 20ft DB9 Female to DB25 Male Serial Modem Cable
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Serial Direct Cable Connection, DB9, DB25, COM Ports and Pinouts
D-Subs, DB9, DB15, DB25, DB37, DB50 Crimp and Solder Connectors
D-subminiature - Wikipedia
