Modem pinout wiring null subminiature Crossover or "null modem" vs. straight through serial cable Cable null modem db9 wiring serial straight crossover standard through vs cts rts does dtr dsr terminal rxd txd handshake
Null Modem D-subminiature Pinout RS-232 Wiring Diagram, PNG, 1024x698px
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Db9 null modem wiring diagram
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