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File:Null modem cable 1.jpg - Wikimedia Commons
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Amazon.com: StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF) : Electronics
Null-Modem Serial Cables
FTDI Chipset Cross Wired USB Seriële DB9 FT232R USB RS232 Null Modem Kabel Pc Control TV Kabel (Standaard DB9 COM poort pinout (pc (host) met usb naar RS232 terminal apparaat (slave)) :
RS232 serial null modem cable wiring and tutorial - Lammert Bies