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On RS232 and RS485 cables, ALL signals are driven through the center pin. One method of accomplishing PWM on RS232 cables is to introduce an NMOS transistor on the underneath side of the cable between the pin and ground. More then one of these transistors on the cable can be used to provide different PWM frequencies, or make different PWM frequencies on each side of the cable.

The cable typically has a DTR and RTS signals terminated on the under side by R, C, L, and H contacts. A DTR/RTS cable goes through the center to the other side of the cable. The R contact may be on the cable or attached by a little connector. All of the R contacts should be in metal, for example, on a plastic ground strip cable. On a thin cable, the GND contacts may be on the bottom.

Typically, the RTS is terminated either by a resistor or a capacitor, but neither of these is a requirement. There is also a DSR/DCD signal terminus on the other side of the cable. The DSR is a common, constant, current signal terminating at C, R, or L at the under side of the cable. The DCD is similarly terminated at C, R, or L at the under side of the cable. d2c66b5586