Chapter 9: Breakout Board
Troubleshooting
142
Psion Teklogix Omnii HDK User Manual
DIP switches 1 & 2 on
bank SW5 not working.
Is HDK_3V3 power enabled
(are LEDs DS11 and DS12 lit)?
Install jumpers across pins of J38
and J37.
Tactile switches SW3 and
SW4 not working.
Is HDK_3V3 power enabled
(are LEDs DS11 and DS12 lit)?
Install jumpers across pins of J38
and J37.
Table 9.17 RS-232/UART Troubleshooting
Symptom
Check
Solution
Device not working.
Are serial data jumpers
set correctly?
Install jumpers J16-J19 to position 1-2.
Install jumpers J20-J23 to position 1-2
for the J11 UART connector, or position
2-3 for the J30 RS-232 connector.
Modem device
not working.
Are modem signal jumpers
set correctly?
Install jumpers J24-J27 and J43-J46 to
position 2-3.
Device not working
(J11 connector).
Is UART power jumper set to
provide the correct voltage?
Install jumper on header J15 to provide
3.3 V (position 1-2) or 5 V (position 2-3)
power as required. Verify VSYS power
enabled (see Power Troubleshooting
section).
Device not working
(J30 connector).
Is EXP_3V3 power being sup-
plied (is breakout board
connected to Omnii
)?
Check and reseat connection at
both ends.
Device not working.
Is device being recognized as
serial (RS-232/UART)
by Omnii?
Program 1-wire EEPROM and configure
registry entries on Omnii to properly
identify device as an RS-232/UART
device. (See Chapter 8: “EEPROM
Specifications” and Section 4.4.1: “Reg-
istry Settings for Expansion Devices”.)
Device not working.
Are data lines on Omnii expan-
sion port set for UART device?
Use API commands to verify and set
data lines for UART function. (See
Section 4.7.4: “Omnii HDK API
Functions”.)
Table 9.18 USB Troubleshooting
Symptom
Check
Solution
Device not working.
Is HDK_5V0 power enabled
(are LEDs DS2 and DS12 lit)?
Install jumpers across pins of J38 and J3.
Device not working.
Is device being recognized as
USB by Omnii?
Program 1-wire EEPROM and configure
registry entries on Omnii to properly
identify device as USB. (See Chapter 8:
“EEPROM Specifications” and
Section 4.4.1: “Registry Settings for
Expansion Devices”.)
Table 9.16 GPIO Troubleshooting
Symptom
Check
Solution
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