What is the schematic of an RS232 Null-Modem? - Ferguson Wiki
Null Modem Cables — Connective Peripherals - Global Store
Delock Products 87472 Delock Serial Cable RS-232 D-Sub 9 female to female null modem with narrow plug housing - Full Handshaking - 2 m
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Delock Products 86604 Delock Serial Cable RS-232 D-Sub9 female to female null modem with narrow plug housing 10 m
Null modem - Wikipedia
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Powertronics RS232 Null Modem Cable
Null-Modem Serial Cables
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