[ Vfdmod ] An easy VFD control over MODBUS RTU

Hi!

Let me guess communication settings are wrong...Check twice ModbusMAT settings (baud rate, data bits, stop bits, parity) and copy them to vfdmod config file. Be sure you are using RTU mode, not ASCII.

I am sure about the modbus communication settings. Checked both ModbusMAT and in the Clasicladder configuration file - the inverter works with both programs. There is a command execution delay of 1-2 seconds. I have 9600, 8N1 and RTU speed set everywhere and a converter connected to / dev / ttyUSB0. I'm running out of ideas

Yes, it's really strange. Could you show your debug output? And what is the last error code you see? 110 or anything else?

On one USB-RS485 converter I have a constant error 112345679 and on the other it almost always 110, sometimes it shows 112345695 but for a short time and 110 returns.
How to show debug output?

ok one step more
it's look like :

Opening /dev/ttyUSB0 at 9600 bauds (N, 8, 1)

vfdmod: reading 'spindle.rpm-out' from address 8203 (0x200B)...
[01][03][20][0B][00][01][FE][08]
Waiting for a confirmation...
<00>
vfdmod: setting command speed value to 5 (0x0005)...
[01][06][20][01][00][05][13][C9]
Waiting for a confirmation...
<00>
vfdmod: reading 'spindle.rpm-out' from address 8203 (0x200B)...
[01][03][20][0B][00][01][FE][08]
Waiting for a confirmation...
<00>
vfdmod: setting command speed value to 5 (0x0005)...
[01][06][20][01][00][05][13][C9]
Waiting for a confirmation...
<00>
and so on ...
but the minimum speed is correctly written to the inverter - it changes from zero to 5

Try to increase ProtocolDelay to 5...15 and watch to debug, is something changes?