Master - Slave comunnication

• J

  Jiri

  4/14/25, 4:50 PM

  Hello, can you help me?

  I have a Master 9M unit with 2 pcs of slave units (2Q) and a WiFi module.

  I have no issues with Master-Slave communication (no beeps, no errors), and readings from the slave BMS units are working.

  Currently, I have one Master connected to one slave unit (address 1). The second one is still in progress.
  I can communicate via the WiFi module with the Master unit (send address 16, receive address 0), but I am not able to connect directly to the slave unit (send address 1, receive address 16).

  I need to recalibrate the first unit because the readings on the ODD side are incorrect — they're off by +4 mV, so I need to send the command ODDC -0.004. Can you please help me?

  Also, I am not able to update the firmware version of the slave units (downloaded from the REC website). I am stuck at determining update versions.

  Thanks for your help.

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• 

  Bill C.

  4/20/25, 1:53 PM

  You may want to DM Rick Bell, the owner for sw/firmware update issues. Send an email to the ogm support email address. support@ogm-energy.com

  Please report back what you learn. I too have a 9M controlling two batts with the REC-Q devices.

  __________
  Cheers, Bill

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• R

  Rick OGM Support Staff

  4/21/25, 5:41 AM

  Have you ried connecting directly to the slave with the Wifi Module?

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