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The following chart shows example measurements taken with a LRF Module. The Difference (Δ) and
% Error will vary per unit.
Error Modes
In the event that the LRF enters the error state (signified by a blinking orange LED status indicator), a
message identifying the failed operation will be transmitted on the SOUT (Serial Out) pin.
Messages include:
ERR: cam.start. Error initializing the camera on LRF power-up. This may be caused by a
communication error between the Propeller and camera.
ERR: cam.init. Error performing the "S" command (Reset camera to initial settings). This may
be caused by a communication error between the Propeller and camera.
ERR: cam.calibrate. Error performing the "E" command (Adjust camera for current lighting
conditions). This may be caused by a communication error between the Propeller and camera.
ERR: cam.setRes. Error setting the camera's resolution. This may be caused by a
communication error between the Propeller and camera.
ERR: cam.getID. Error retrieving the camera's manufacturer and product IDs. This may be
caused by a communication error between the Propeller and camera.
ERR: eeprom.ReadLong. Error reading calibration data from the external Serial EEPROM. This
may be caused by a communication error between the Propeller and EEPROM or an incorrect
type of EEPROM device.
ERR: eeprom.WriteLong. Error writing calibration data to the external Serial EEPROM. This
may be caused by a communication error between the Propeller and EEPROM or an incorrect
type of EEPROM device.
If the LRF is in an error state, but no error message is transmitted, then there is a failure either with
starting the JDCogSerial serial communication cog or the auto baud detection cog.
For further assistance, please contact Parallax technical support.
Copyright © Parallax Inc.
Parallax Laser Range Finder (#28044)
v1.0 9/16/2011 Page 9 of 24
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