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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).
The most common usage is the DB25, using TASCAM's pinout (now standardised in AES59 by the Audio Engineering Society [1]). To avoid the possibility of bent pins on fixed equipment, the male connector is generally fitted to the cabling and the female connector to the equipment.
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 ...
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.
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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.
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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