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Annotation of coherent/a/usr/man/COHERENT/rs-232, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: RS-232                Technical Information                RS-232
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        !             8: COM port wiring
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        !            11: This article  details the  connections (pinouts) of  EIA standard
        !            12: RS-232C.  This  connect consists of a D-shaped  plug with 25 pins
        !            13: in two rows: 13 pins in  the upper row and 12 in the lower.  This
        !            14: interface  is commonly  used  by devices  that  require a  serial
        !            15: interface to a computer; these devices include modems, terminals,
        !            16: serial  printers,  and   such  specialized  devices  as  bar-code
        !            17: scanners.  In  addition, this articles  gives the pinouts  of the
        !            18: nine-pin DB-9P connector, which  is a nine-pin version of the RS-
        !            19: 232 that is commonly used in AT and AT-compatible computers.
        !            20: 
        !            21: ***** RS-232 Pinout *****
        !            22: 
        !            23: The  following  table  gives  the  25-pin  EIA  standard  RS-232C
        !            24: pinouts.  It also gives:
        !            25: 
        !            26: 
        !            27:         ->      nine-pin DB-9P convention
        !            28:         ->      common abbreviations of signal names
        !            29:         ->      abbreviations of RS-232 signal names
        !            30:         ->      equivalent CCITT signal-number designations
        !            31:         ->      signal direction (as appropriate)
        !            32:         ->      signal description
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        !            35: Please note  that in this  table, DDTTEE stands  for ``data terminal
        !            36: equipment'' and refers to terminal-type equipment such as a PC or
        !            37: a  terminal,   whereas  DDCCEE  stands   for  ``data  communications
        !            38: equipment'' and refers to modems and modem-type equipment.
        !            39: 
        !            40: _D_B-_2_5 _D_B-_9 _C_o_m_m_o_n
        !            41: _P_i_n # _P_i_n #_N_a_m_e   _E_I_A _C_C_I_T_T_D_T_E-_D_C_E _D_e_s_c_r_i_p_t_i_o_n
        !            42:   1         FG    AA   101   --    Frame ground
        !            43:   2    3    TD    BA   103   ->    Transmitted data
        !            44:   3    2    RD    BB   104   <-    Received data
        !            45:   4    7    RTS   CA   105   ->    Request to send
        !            46:   5    8    CTS   CB   106   <-    Clear to send
        !            47:   6    6    DSR   CC   107   <-    Data set ready
        !            48:   7    5    SG    AB   102   --    Signal ground
        !            49:   8    1    DCD   CF   109   <-    Data carrier detect
        !            50:   9         --    --   --    --    Positive DC test voltage
        !            51:   10        --    --   --    --    Negative DC test voltage
        !            52:   11        QM    --   --    <-    Equalizer mode
        !            53:   12        SDCD  SCF  122   <-    Secondary carrier detect
        !            54:   13        SCTS  SCB  121   <-    Secondary clear to send
        !            55:   14        STD   SBA  118   ->    Secondary transmitted data
        !            56:   15        TC    DB   114   <-    Transmitter clock
        !            57:   16        SRD   SBB  119   <-    Secondary receiver clock
        !            58:   17        RC    DD   115   ->    Receiver clock
        !            59:   18        DCR   --   --    <-    Divided clock receiver
        !            60:   19        SRTS  SCA  120   ->    Secondary request to send
        !            61:   20   4    DTR   CD   108.2 ->    Data terminal ready
        !            62: 
        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            68: 
        !            69: RS-232                Technical Information                RS-232
        !            70: 
        !            71: 
        !            72: 
        !            73:   21        SQ    CG   110   <-    Signal quality
        !            74:   22   9    RI    CE   125   <-    Ring indicator
        !            75:   23        --    CH   111   ->    Data rate selector
        !            76:   24        TC    DA   113   <-    Transmitted clock
        !            77:   25
        !            78: 
        !            79: ***** Files *****
        !            80: 
        !            81: /uussrr/ppuubb/rrss223322 -- On-line version of above table
        !            82: 
        !            83: ***** See Also *****
        !            84: 
        !            85: tteecchhnniiccaall iinnffoorrmmaattiioonn, tteerrmmiinnaall
        !            86: 
        !            87: Seyer,  M.D.: _R_S-_2_3_2 _M_a_d_e  _E_a_s_y: _C_o_n_n_e_c_t_i_n_g  _C_o_m_p_u_t_e_r_s, _P_r_i_n_t_e_r_s,
        !            88: _T_e_r_m_i_n_a_l_s, _a_n_d _M_o_d_e_m_s.  Englewood Cliffs, NJ, Prentice-Hall Inc.,
        !            89: 1984.
        !            90: 
        !            91: ***** Notes *****
        !            92: 
        !            93: Serial ports on the back of  the PC use either a 25-pin male (DB-
        !            94: 25P) or a nine-pin male  (DB-9P) connector.  Due to what can only
        !            95: be considered  as extreme  stupidity, the 25-pin  female (DB-25S)
        !            96: connector was  chosen for the parallel  printer port, rather than
        !            97: using the usual  36-pin parallel connector.  Do not confuse these
        !            98: ports when wiring custom cable assemblies, as you can damage your
        !            99: equipment!
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        !           130: COHERENT Lexicon                                           Page 2
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