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Serial Port and Modem Cables
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Crossover or "null modem" vs. straight through serial cable
Modem serial rs232 wiring port diagram dce parallel rs connecting devices two interfacing figure connected .
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![Serial Port and Modem Cables](https://i2.wp.com/www.columbia.edu/kermit/nullmodem.jpg)
![Interfacing The Serial / RS-232 Port](https://i2.wp.com/wearcam.org/seatsale/programs/www.beyondlogic.org/serial/nullmode.gif)
![Null modem vs crossover cable - IT and Computers - Thailand Visa Forum](https://i2.wp.com/www.home-machine-shop.com/bits/NULL_MODEM_CABLE.jpg)
![Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive](https://i2.wp.com/www.decisivetactics.com/support/img/cable_null_hs.png)