Serial Cable

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This is the way you need to solder your cable.

Serial connector pinouts

Db9-serial.png

Minidin8-serial.png

Db25-serial.png

 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.