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Serial Cable DB9, Female/Female, 6ft - Null Modem Cable
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StarTech.com 3m RS232 Serial Null Modem Cable, Crossover Serial Cable w/Al-Mylar Shielding, DB9 Serial COM Port Cable Female to Male, Compatible w/DTE Devices | www.shi.com
Null Modem Adapter Serial DB9 Male to Male | Computer Cable Store