Difference between revisions of "Serial Cable"

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This is the way you need to solder your cable.
 
This is the way you need to solder your cable.
  
Crossed Serial Cable Pinout
+
== Serial connector pinouts ==
 +
 
 +
<pre>
 +
        1                        13        1        5
 +
      _______________________________      _______________
 +
      \  . . . . . . . . . . . . .  /      \  . . . . .  /
 +
      \  . . . . . . . . . . . .  /        \  . . . .  /
 +
        ---------------------------          -----------
 +
        14                      25          6      9
 +
 
 +
                25-pin Sub-D                9-pin Sub-D
 +
 
 +
                      ----
 +
                    /6 7 8 \
 +
                    | 3 4 5 |
 +
                    \ 1 2 /
 +
                      ---
 +
 
 +
                    8-pin Mini-DIN
 +
 
 +
Name (V24)  25pin  9pin  8pin Dir  Full name              Remarks
 +
--------------------------------------------------------------------------
 +
    TxD        2    3    3  o  Transmit Data          Data
 +
    RxD        3    2    5  i  Receive Data            Data
 +
    RTS        4    7    6  o  Request To Send        Handshaking
 +
    CTS        5    8    2  i  Clear To Send          Handshaking
 +
    DTR        20    4    1  o  Data Terminal Ready    Status
 +
    DSR        6    6    -  i  Data Set Ready          Status
 +
    RI        22    9    -  i  Ring Indicator          Status
 +
    DCD        8    1    7  i  Data Carrier Detect    Status
 +
    GND        7    5  4,8  -  Signal ground          Reference level
 +
    -          1    -    -  -  Protective ground      Don't use this one
 +
                                                            as signal ground!
 +
</pre>
 +
 
 +
== How to connect the connectors ==
  
 
<pre>
 
<pre>
          SGI-Mini-DIN-8      |              Sub-D 25
 
              (male)          |              (female)
 
  ----------------------------------------------------------------------
 
              6 7 8            | 13 12 11 10  9  8  7  6  5  4  3  2  1
 
              3 4 5            |  25 24 23 22 21 20 19 18 17 16 15 14
 
                1 2            |
 
 
   ----------------------------------------------------------------------
 
   ----------------------------------------------------------------------
 
   DTR - Data Terminal Ready  1 |  6  DSR - Data Set Ready
 
   DTR - Data Terminal Ready  1 |  6  DSR - Data Set Ready
Line 21: Line 50:
 
</pre>
 
</pre>
  
Thiemo also said that it might be needed to have a connection between pin 20 and pin 8 on the Sub-D 25 connector to have your terminal do a carrier detect.
+
It it might be needed to have a connection between pin 20 and pin 8 on the Sub-D 25 connector to have your terminal do a carrier detect. SGI is using the same pin-pout for it's 8-pin mini-DIN connectors as Apple for it's machines.  Therefor cables and adapters suitable for use with Apple system may be used.
Both numberings are done looking to the front of the connectors - not the soldering site ! (Note the male / female).
+

Revision as of 12:23, 4 July 2005

This is the way you need to solder your cable.

Serial connector pinouts

        1                         13         1         5
      _______________________________      _______________
      \  . . . . . . . . . . . . .  /      \  . . . . .  /
       \  . . . . . . . . . . . .  /        \  . . . .  /
        ---------------------------          -----------
        14                       25           6       9

                25-pin Sub-D                 9-pin Sub-D

                       ----
                     /6 7 8 \
                    | 3 4 5 |
                     \ 1 2 /
                       ---

                    8-pin Mini-DIN

 Name (V24)  25pin  9pin  8pin Dir  Full name               Remarks
--------------------------------------------------------------------------
    TxD         2     3     3   o   Transmit Data           Data
    RxD         3     2     5   i   Receive Data            Data
    RTS         4     7     6   o   Request To Send         Handshaking
    CTS         5     8     2   i   Clear To Send           Handshaking
    DTR        20     4     1   o   Data Terminal Ready     Status
    DSR         6     6     -   i   Data Set Ready          Status
    RI         22     9     -   i   Ring Indicator          Status
    DCD         8     1     7   i   Data Carrier Detect     Status
    GND         7     5   4,8   -   Signal ground           Reference level
     -          1     -     -   -   Protective ground       Don't use this one
                                                            as signal ground!

How to connect the connectors

  ----------------------------------------------------------------------
  DTR - Data Terminal Ready   1 |   6   DSR - Data Set Ready
  CTS - Clear To Send         2 |   4   RTS
  TD  - Transmit Data         3 |   3   RD
  SG  - Signal Ground       4,8 |   7   SG
  RD  - Receive Data          5 |   2   TD
  RTS - Request To Send       6 |   5   CTS
  DCD - Data Carrier Detect   7 |  20   DTR
                         Shield |   1   Protective Ground

It it might be needed to have a connection between pin 20 and pin 8 on the Sub-D 25 connector to have your terminal do a carrier detect. SGI is using the same pin-pout for it's 8-pin mini-DIN connectors as Apple for it's machines. Therefor cables and adapters suitable for use with Apple system may be used.