Opto 22

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KB82781
Network LED Dimmer using Optomux or Modbus protocol may become unresponsive
Revision:  1.0
Published:  3/13/2014
Applies To
LED-SPCV-LV100W
Versions
Problem affects firmware revisions:  
3 and lower
Problem is fixed in firmware revision:  
4

SYMPTOMS

An unterminated (no End-of-Message character) packet larger than 513 characters causes the Network LED Dimmer's serial command processor for Optomux and Modbus protocols to become unresponsive.

To determine current firmware revision on your LED Dimmer:

  • For Modbus, send a Report Slave ID command and parse the data for Firmware revision.
  • For Optomux, send Read Device Info command and parse the data for the Firmware revision.

See detailed information in the Network LED Dimmer User's Guide, form 2038.

WORKAROUND

Any one of the following:

  • Cycle power to the Network LED Dimmer.
  • Make sure that the host sends properly formed commands with the EOM character. 
  • Contact Opto 22 Product Support for an RMA, and then send the unit back to Opto 22 to be reprogrammed with newer firmware.

RESOLUTION

Opto 22 has resolved this issue.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

DISCLAIMER

This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

OPTO 22 DOES NOT WARRANT THE COMPLETENESS, TIMELINESS, OR ACCURACY OF THE DATA CONTAINED IN THIS OPTOKB ARTICLE AND MAY MAKE CHANGES THERETO AT ANY TIME AT ITS SOLE DISCRETION WITHOUT NOTICE. FURTHER, ALL INFORMATION CONVEYED HEREBY IS PROVIDED TO USERS 'AS IS.' IN NO EVENT SHALL OPTO 22 BE LIABLE FOR ANY DAMAGES OF ANY KIND INCLUDING DIRECT, INDIRECT INCIDENTAL, CONSEQUENTIAL, LOSS PROFIT, OR DAMAGE, EVEN IF OPTO 22 HAS BEEN ADVISED ON THE POSSIBILITY OF SUCH DAMAGES.

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