The wiring of RS-232 EX0-101 devices involves first identifying the actual pins that are being used.
Please note also that in the "PC COMx Port context" end of things some signals are 'inputs' while others are 'outputs' EX0-100 while in the "Modem context" those same signal names referred to now become as 'outputs' where they were just before 'inputs' and visa versa. That is where much confusion has arisen from over the years, as the 'Input' or 'Output' -sense- nature is not noted in most diagrams on the subject in general, yet in the real 1Y0-259 world two 'Out' pins seldom can ever work in harmony in RS-232 related +-[3-10]V stuff where the range from -3V to +3V is not a true high or low, except to possibly burden drivers towards their undesired burnout.
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