Cable null modem db9 wiring serial straight crossover through vs standard cts does dtr rts dsr terminal handshake data exist Db9 rj45 db25 modem null rs232 pinout handshaking make gamesx dce dte bps Serial port and modem cables
Null modem cable.gif
Null modem cable.gif
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X68000:rs232_null_modem_cable_with_partial_handshaking [nfg games + gamesx] .