Crossover or "null modem" vs. straight through serial cable Cable null modem db9 wiring serial straight crossover through vs standard cts does dtr rts dsr terminal handshake data exist Interfacing the serial / rs-232 port
Serial Port and Modem Cables
Modem serial rs232 wiring port diagram dce parallel rs connecting devices two interfacing figure connected
Null modem vs crossover cable
Serial port and modem cables .
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