How to make your own Psion 3c/Sienna/s5 serial cable:
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 adapter as well.
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