[W-MBUS] Why is the RC1180-MBUS3 module sending «=» (or 0x3D) on the TXD line?

This is a special interface protocol that have been (accidently) activated. Please check the DATA_INTERFACE parameter (at address 0x36). It may be an indication of the configuration memory has been corrupted when using the “M”command. Please ensure the re-configuration command is completed (prompt on TXD) before removing supply power or resetting the module.

Last Update: September 14, 2017  

September 14, 2017   526    Wireless M-Bus Q&A