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) DB25 Pin# DB9 Pin# MiniDIN8 Pin# Direction Full Name Remarks
TxD 2 3 3 Out Transmit Data Data
RxD 3 2 5 In Receive Data Data
RTS 4 7 6 Out Request To Send Handshaking
CTS 5 8 2 In Clear To Send Handshaking
DTR 20 4 1 Out Data Terminal Ready Status
DSR 6 6 - In Data Set Ready Status
RI 22 9 - In Ring Indicator Status
DCD 8 1 7 In 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.