Connecting To Omnii - Psion Teklogix OMNii HDK XT10 User Manual

Chapter 9: Breakout Board

Connecting to Omnii

9.4

Connecting to Omnii

Before connecting the breakout board to the hand-held computer, install the standoffs included
with the kit to keep the board components safely suspended above the work surface. Align the
standoffs under the holes in the four corners of the board, and install a screw in each to secure
them in place. Do not overtighten!
The breakout board connects to any of the three standard expansion ports on Omnii and isolates
the specific functions of those ports for design and testing purposes. A flex cable is included with
the breakout board kit which connects to the 20-pin socket (J42) of the breakout board on one end,
and to the Omnii 22-pin expansion ports on the other end.
Expansion port 3 is not a 22-pin port but is instead incorporated into the 100-pin multi-function
connector; therefore the flex cable cannot be used to connect directly to this port. A cable with a
100-pin connector can be constructed using the pinout and socket information provided in
Section 6.4.4: "Expansion Port 3 (100-pin Multi-Function Connector)". However, if a
GPS/WWAN module is installed in the 100-pin connector, the included flex cable can be used
with the 22-pin expansion port located on the back of that module. In this configuration, the socket
may be considered identical to Expansion Port 2; follow the instructions for that port instead.
The 26-pin ZIF (zero-insertion force) connector J33 is redundant with J42 and can be used as an
alternate means of connecting to the hand-held computer. However, ZIF connectors are not
designed to withstand repeated cable insertion/removal cycles, therefore it is not recommended to
use the J33 socket unless necessary.
The J33 and J42 connectors are not independent and cannot be used to connect to two expansion
ports at one time.
126 Psion Teklogix Omnii HDK User Manual