The "bytes missing" error often indicates that the master device (Modbus Poll) stopped listening before the slave device finished sending its data. Increasing the response timeout is the most frequent fix. How to deal with Modbus communication problem? - XWiki
In industrial environments, electromagnetic interference (EMI) from VFDs (Variable Frequency Drives) or motors can corrupt specific bytes, making the frame appear incomplete. modbus poll bytes missing error fixed
Logging 40 holding registers from a solar inverter over RS485 (9600 baud, 8N1) Old behavior (v8.x): Frequent “Bytes missing” errors, especially during polls every 200 ms. New behavior (v9.2.1 build 1824): Rock-solid for 72 hours of continuous polling. The "bytes missing" error often indicates that the
Based on common troubleshooting for Modbus RTU communication, the "bytes missing" or "bytes not received" error in Modbus Poll - XWiki In industrial environments
"Missing bytes" often means corrupted bytes. If you are using RS-485: