The function you pointed me seems to operate when slave responds as being busy, but as of what I understood from RTU datasheets, if the wait between 2 frames is not long enough, the slave will just assume it as being another part of the same frame isn't it?
would you happen to know what can cause a multiple transmission to only send for example 1 / 3 frames?
I'm trying to control a motor drive and I need to send 3 commands back to back. I'm waiting 500ms between each frame, which is way overkill (let's be safe for testing) towards the "3.5 char time silence". But my sniffer only catches some frames, not always the same