The cable is a PCMCIA-type cable assembly connected to a 9 pin D socket. The connections between the pins are identical to those in the PsiWin cable. The D socket cover has thumbscrews to enable secure attachment to a PC, and a strain relief grommet to prolong the life of the cable. The cable is 12 inches long. (I know that this is a bit short, but the PCMCIA cable assembly only comes with that much cable on it...)

If you want to connect your Psion 3c, s5 or Sienna to a modem rather than to a computer, you will need a null-modem cable.

The parts are available from CPC. Note that the cable assembly is not identical to the connector on the cable that Psion supply, having a different arrangement of small plastic keyways. This doesn't usually makes any difference in practice.

Part Number:      Description:

CN00842           PCMCIA Cable Assy
CSSOCKET15        9 way socket (pack of 10)
CNDPT9B           Plastic D hood and thumbscrews
CSCPL-12          D hood black cable grommet (pack of 10)

Connections for Psion 3c / Sienna serial cable are:

 Psion:
    _____________
 1  \___________/  15
   

 9-pin D socket:
   ---------------
   \  5 4 3 2 1  / 
    \  9 8 7 6  /
      ---------

9-pin:  Psion:  RS232:
1       nc      DCD     data carrier detect
2       4       RD      received data
3       8       TD      transmitted data
4       5       DTR     data terminal ready
5       15      SG      signal ground
6       3       DSR     data set ready
7       7       RTS     request to send (= DTE ready)
8       2       CTS     clear to send (= DCE ready)
9       6       RI      ring indicator