Leo's Psion Page

Unless otherwise mentioned, everything here applies to the Sienna, Series 3c and Series 5. There is nothing here for owners of the 3a or earler machines. I take no responsibility for any damage caused or loss incured as a result of following any of the instructions below.
  1. Amazing 5 Series Software
  2. Series 5 Programming Page
  3. Connect a Sienna/3c to a PC without buying PsiWin (legal)
  4. Battery Survey
  5. Linking an Ericsson GS18 to Psion
  6. Getting hold of a serial cable
  7. How to connect a GS18 directly


Amazing 5 Series Software

All this stuff is written in Series 5 OPL.

Connect a Sienna/3c to a PC without buying PsiWin (legal)

Linking an Ericsson GS18 to Psion

Here are three methods, in increasing order of neatness, and difficulty:

Getting hold of a serial cable

Note: The Sienna, Series 3c and Series 5 serial cables and Psiwin cables are exactly the same.

How to connect a GS18 directly

From: "J.L. Farines" <farines@compuserve.com>
Subject: Ericsson GS18 to Psion Serie3c connectors wiring description
Date: Wed, 14 Jan 1998 23:42:55 +0100

A while ago I decided to build a short cable between Psion Serie3c and the
Ericsson GS18, because adding 3 cables (Psion + null modem + GS18) together
is not really a "pocket" solution.
Now I use the PsiMail Internet package with this cable and can access the
net from my pocket. I tried it on the new Psion Serie5 and the Messaging
suite and it also works perfectly well.

For a working communication between psion and GS18, parameters used are
these :
XON/XOFF = OFF
RTC/CTS = ON
DSR/DTR = OFF
DCD = OFF

Here following is the details of the wiring between the Psion and the GS18.
I built the cable with the one found in the GS18 box and a standard Psion
serial cable. It is difficult but possible to solder the GS18 connector as
it is very small but nethertheless, being patient, it is possible.

(To view with courrier font)
GS18 connector (front)

  7     1
___________
! ======= O !
!_----_----_!
  8     14

Psion Honda connector (front)
   ______________
1  \____________/ 15


Psion Honda               GS18
Connector               Connector

5 --------DCD/DTR--------- 1
8 -----------TD----------- 11
4 -----------RD----------- 4
3 -----------DSR---------- 13
15 ----------SG----------- 6
2 -----------CTS---------- 14
7 -----------RTS---------- 2
6 -----------RI----------- X

(X means : no connection)

Good luck.