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Presence of a 25-pin D-sub connector does not necessarily indicate an RS-232-C compliant interface. For example, on the original IBM PC, a male D-sub was an RS-232-C DTE port (with a non-standard current loop interface on reserved pins), but the female D-sub connector on the same PC model was used for the parallel "Centronics" printer port .
Connectors on this cable would be designated: 1A1W35P1; 1A1W35P2; ASME Y14.44-2008 continues the convention of Plug P and Jack J when assigning references for electrical connectors in assemblies where a J (or jack) is the more fixed and P (or plug) is the less fixed of a connector pair, without regard to the gender of the connector contacts.
A male D-subminiature DE-9 connector on an IBM PC compatible computer (with serial port symbol) used for an RS-232 serial port A female D-subminiature DE-9 connector on an RS-232 cable. A serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. [1]
The connector specification is defined by the ISO document 4903. [3] At the time, most physical layer protocols such as RS-232-C and RS-449 use analog signaling. X.21 was first introduced as a means to provide a digital signaling interface for telecommunications.
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The Aquarius manual did not contain details of any of the ports available. The cassette port, although using the same 5-Pin DIN 41524 connector as the TRS-80, did not have the same pin out and thus was incompatible with readily available cables for the TRS-80, even though they physically fit the sockets on both the computer and cassette player ...
RS-423 is the common short form title of American National Standards Institute (ANSI) standard ANSI/TIA/EIA-423-B Electrical Characteristics of Unbalanced Voltage Digital Interface Circuits and its international equivalent ITU-T Recommendation T-REC-V.10, [3] also known as X.26.
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 ...
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