Chapter 9: Breakout Board
RS-232 / UART Devices
134
Psion Teklogix Omnii HDK User Manual
Figure 9.11 GPIO LED Indicators (DS3, DS4, DS5, DS6)
DIP switches 1 and 2 on switch bank SW5 are connected to GPIO lines 4 and 5, respectively. One
end of each DIP switch is pulled high with 10 kohm to 3.3 V, and the other end is grounded. With
the DIP switch in position 1, the corresponding line reports High status to Omnii. Moving the
switch over to position 2 changes the line status to Low. VSYS 3.3 V (HDK_3V3) power must be
enabled to power these switches.
DIP switches 3 and 4 on bank SW5 are not connected.
Figure 9.12 GPIO DIP Switch Bank (SW5)
The tactile switches SW3 and SW4 are connected to GPIO lines 6 and 7 respectively. The default
position of each switch is pulled high with 10 kohm to 3.3 V, and the other position is grounded.
With the switch unpressed (position 1), the corresponding line reports High status to Omnii. Press
the switch down to position 2 to change the line status to Low. VSYS 3.3 V (HDK_3V3) power
must be enabled to power these switches.
Figure 9.13 GPIO Tactile Switches (SW3 & SW4)
9.7
RS-232 / UART Devices
This section describes how to configure the breakout board to test serial devices.
1
2
3
4
POS 1 POS 2
SW3
SW4
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