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3M™ MicroTouch™ Controller EX Dual Mode Reference Guide
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3M Touch Systems, Inc. Proprietary Information – TSD-40848A
Status Light (LED) Diagnostics
3M™ MicroTouch™ controllers are highly reliable units; however, there may be
occasions when the controller does not perform exactly as you expected. The EX dual
mode controller provides diagnostic feedback with a light emitting diode (LED) on the
component side of the board that indicates the status of the touch system.
When you power-up the unit, the LED is bright until the controller start-up sequence is
completed. Following start-up, the LED becomes dim and remains dim as long as you do
not touch the sensor. When you touch the sensor, the LED becomes bright as long as a
touch is detected.
A flashing (or blinking) LED during power-up indicates the controller’s power-on
self-test failed. Refer to Table 4 for a description of each error code.
Table 4. LED Diagnostic Codes for the Dual-Mode Controller
Self Test
Condition
LED
Flashes
Self
Test
Bit
Description
What to do...
RAM Data
Error
2
1
0
Data side checksum error
Reload program code.
RAM Code
Error
2
2 1
Firmware
EEPROM
checksum verification error
Reload program code.
STRAY Error
1
3
2
Unable to initialize stray
cancellation
Replace controller. If error reoccurs,
might be a sensor problem.
NOV Error
3
4
3
Parameters invalid (using
defaults)
Restore defaults. If fault persists,
replace controller. If error reoccurs,
might be a sensor or cable problem.
HDW Error
1
5
4
Controller hardware failure
(phase/gain initialization)
Cycle power. If fault persists,
replace controller.
Reserved 6 5
Reserved
Reserved 7 6
Reserved
NOV2 Error
8
7
Controller NOVRAM
linearization data invalid
Replace sensor or perform a 25-
point linearization. Contact
Technical Support.
Reserved 9 8
Reserved
EEPROM
Error
2
10
9
EEPROM is not working
Reload program code.
NOV5 Error
11
10
Controller ID is not valid
Restore defaults. If fault persists,
replace controller.
NOV6 Error
12
11
Interface configuration
values are not valid
Restore defaults. If fault persists,
replace controller.
NOV7 Error
13
12
Touch configuration values
are not valid
Restore defaults. If fault persists,
replace controller.
Reserved 14 13
Reserved
Resistance
Error
15
14
Sensor resistance is out of
supported range
Cycle power. If fault persists,
replace sensor.