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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).
Pin No (DB25) Pin No (36 pin) Signal name Direction Register - bit Inverted 1 1 Strobe In/out Control-0 Yes 2 2 Data0 Out Data-0 No 3 3 Data1 Out Data-1 No 4 4 Data2 Out Data-2 No 5 5 Data3 Out Data-3 No 6 6 Data4 Out Data-4 No 7 7 Data5 Out Data-5 No 8 8 Data6 Out Data-6 No 9 9 Data7 Out Data-7 No 10 10 Ack In Status-6 No 11 11 Busy In Status-7
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For example, DB-25 denotes a D-sub with a 25-position shell size and a 25-position contact configuration. The contacts in each row of these connectors are spaced 326/3000 of an inch apart, or approximately 0.1087 inches (2.76 mm), and the rows are spaced 0.112 inches (2.84 mm) apart; the pins in the two rows are offset by half the distance ...
The 9-pin DE-9 connector has been used by most IBM-compatible PCs since the Serial/Parallel Adapter option for the PC-AT, where the 9-pin connector allowed a serial and parallel port to fit on the same card. [4] This connector has been standardized for RS-232 as TIA-574.
Pinout RS-530 DTE using male DB-25. Currently known as TIA-530-A, but often called EIA-530, or RS-530, is a balanced serial interface standard that generally uses a 25-pin connector, originally created by the Telecommunications Industry Association.
Early SCSI interfaces commonly used a 50-pin micro ribbon connector. This connector is similar to the 36-pin connector used by Centronics for the parallel interface on their printers, thus the connector became popularly known as "Centronics SCSI" or "CN-50". It is also referred to as a "SCSI-1 connector"; since many connectors have been used ...
MT8870 pin 15 provides a pulse when any valid DTMF digit is decoded, so this signal is used on one input of each gate on the HCF4081. The other gate input is from MT8870 pins 11,12,13,14. The output of the HCF4081 (pins 3,4,10,11) connect to the parallel port and provide the pulsed input that IRLP needs.