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Male pinout of a 25-pin serial port (D-subminiature, DB-25) commonly found on 1980s computers. The following table lists commonly used RS-232 signals (called "circuits" in the specifications) and their pin assignments on the recommended DB-25 connectors [14] (see Serial port pinouts for other commonly used connectors not defined by the standard).
A null modem adapter. Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable.The name stems from the historical use of RS-232 cables to connect two teleprinter devices or two modems in order to communicate with one another; null modem communication refers to using a crossed-over RS-232 cable to connect the teleprinters ...
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Frequent use of a serial port is for a direct computer-to-computer connection. This requires an adapter called a null modem, which isn't actually a modem in the traditional sense, but rather a connector plug that simply crosses the complementary pins on two serial ports so the two sides can communicate. A null modem typically connects the DTR ...
Floppy drive A/B twist pinout Wire Controller Drive A Drive B Description 1-9 1-9 1-9 1-9 No Change 10 10 16 10 Motor Enable Drive 0/1 11 11 15 11 Ground, No Change 12 12 14 12 Drive Select 0/1 13 13 13 13 Ground, No Change 14 14 12 14 Drive Select 0/1 15 15 11 15 Ground, No Change 16 16 10 16 Motor Enable Drive 0/1 17-34 17-34 17-34 17-34
Pmod type pinouts type 1 (7) 2 (8) 3 (9) 4 (10) 5 (11) 6 (12) Type 1 GPIO1 GPIO2/PWM: GPIO3 GPIO4 GND Vcc Type 1A (extended GPIO) GPIO1 GPIO5 GPIO2/PWM GPIO6/PWM GPIO3 GPIO7 GPIO4 GPIO8 GND GND Vcc Vcc Type 2 CS MOSI MISO SCK GND Vcc Type 2A (extended SPI) CS1 GPIO/INT MOSI GPIO/RESET MISO GPIO/CS2 SCK GPIO/CS3 GND GND Vcc Vcc Type 3 CTS/GPIO TxD
A digital current loop uses the absence of current for high (space or break), and the presence of current in the loop for low (mark). [1] This is done to ensure that on normal conditions there is always current flowing and in the event of a line being cut the flow stops indefinitely, immediately raising the alarm of the event usually as the heavy noise of the teleprinter not being synchronized ...
Data Terminal Ready (DTR) is a control signal in RS-232 serial communications, transmitted from data terminal equipment (DTE), such as a computer, to data communications equipment (DCE), for example a modem, to indicate that the terminal is ready for communications and the modem may initiate a communications channel.