number 104") should be data from the DCE to the DTE. Pin 3 on the original 25-pin D connector (described in the standard as "Received Data", "Circuit BB", "V24. number 103") should be data from the DTE to the DCE. Pin 2 on the original 25-pin D connector (described in the standard as "Transmitted Data", "Circuit BA", "V24. Note: All pin numbers below refer to the original 25-pin D connector the numbering changed on the 9-pin connector used on later PCs.ĭTE = Data Terminal Equipment - in the old days, this would usually be a terminal or a printer, or equipment emulating those.ĭCE = Data Communications Equipment - in the old days, this would usually be a modem or other WAN interface. It might be easier to understand, if we quickly review how the RS-232 standard was originally used.
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March 2023
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