Difference between revisions of "Serial Cable"

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(Put in some better diagrams of the ports.)
m (Serial connector pinouts: Repaced the ASCII-art table with a true HTML table in Wiki syntax)
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</table>
 
</table>
  
<pre>
+
{| border="1" cellpadding="2"
Name (V24) 25pin  9pin  8pin Dir  Full name              Remarks
+
| Name (V24) || DB25 Pin# || DB9 Pin# || MiniDIN8 Pin# || Direction || Full Name || Remarks
--------------------------------------------------------------------------
+
|-
    TxD         2     3     3   o  Transmit Data           Data
+
| TxD ||  2 || 3 ||  3 || Out || Transmit Data       || Data
    RxD         3     2     5   i  Receive Data           Data
+
|-
    RTS         4     7     6   o  Request To Send         Handshaking
+
| RxD ||  3 || 2 ||  5 ||  In || Receive Data       || Data
    CTS         5     8     2   i  Clear To Send           Handshaking
+
|-
    DTR       20     4     1   o  Data Terminal Ready     Status
+
| RTS ||  4 || 7 ||  6 || Out || Request To Send     || Handshaking
    DSR         6     6     -   i  Data Set Ready         Status
+
|-
    RI         22     9     -   i  Ring Indicator         Status
+
| CTS ||  5 || 8 ||  2 ||  In || Clear To Send       || Handshaking
    DCD         8     1     7   i  Data Carrier Detect     Status
+
|-
    GND         7     5   4,8   -   Signal ground           Reference level
+
| DTR || 20 || 4 ||  1 || Out || Data Terminal Ready || Status
    -         1     -     -   -   Protective ground       Don't use this one
+
|-
                                                            as signal ground!
+
| DSR ||  6 || 6 ||  - ||  In || Data Set Ready     || Status
</pre>
+
|-
 +
| 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 ==
 
== How to connect the connectors ==

Revision as of 01:11, 24 September 2005

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.