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Annotation of coherent/a/usr/man/COHERENT/rs-232, revision 1.1.1.1

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                      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
                     33: 
                     34: 
                     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
                     65: 
                     66: 
                     67: 
                     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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