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Smart serial dte cable use5/17/2023 ![]() ![]() ![]() For example, a modem can hang up the telephone line when DTR is LOW. 3V)įor example, Advanced Serial Port Monitor can automatically control the DTR signal and set it LOW (-12V) when sends data out.Ī modem (or another device) that receives thisĭTR signal on another side (if these pins are connected) may do various things. RS232 uses following voltages for signals: ITU V.24 (pins description and names) and V.28 (electrical). RS232 defines both the physical andĮlectrical layers of this interface. Telecommunications Industry Association) issued several RS232 standards. This is defined by the hardware interface and you can't change it.īut all other pins can be controlled by a software and can be used for other tasks (rarely). Only 3 pins of the 9 have a fixed meaning: send, receive and signal Note: DCD can be sometimes labeled as CD Port Pins May Have No Constant Meaning
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