This is log MKS Tinybee whith FluidNC 3.7.8. and H100 VFD driver (work fine). FluidNC with this parameter in yaml file H100: uart: txd_pin: gpio.17 rxd_pin: gpio.16 rts_pin: NO_PIN baud: 19200 mode: 8N1 modbus_id: 1 tool_num: 0 speed_map: 0=0% 6000=25% 24000=100% My inverter is G-PENNY H100-2.252-1B manual to https://community.carbide3d.com/uploads/short-url/xtTUvnET1LPfu7W4Q2ApmubyPNX.pdf The VFD setting is JP4=on F002=2 F003=2 F163=1 F164=2 F164=0 F169=0 For send command I use IOSENDER 2.0.42. The commands sequence after reset is M3 S7200, M3 S1000, M5, M3S0, M4 S7200, M4 S10000, M5. I read directly the Modbus whith RS485 adapter and Serial Port Monitor. ---------------------------------------------------------------------------------- (after reset) ---------------------------------------------------------------------------------- [14/09/2023 15:36:14] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 00 00 00 00 Register0: 0 Register1: 0 Checksum: 0xfb84 - OK >>>>(send M3 S7200) ---------------------------------------------------------------------------------- [14/09/2023 15:36:35] Modbus Response (COM11) Address: 1 Function: 5 (0x05) - Write Single Coil Address: 73 Value: 65280 Checksum: 0x5dec - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:35] Modbus Response (COM11) Address: 1 Function: 6 (0x06) - Write Single Register Address: 513 Value: 1199 Checksum: 0x9b0e - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:36] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 01 dd 04 af Register0: 477 Register1: 1199 Checksum: 0x28fe - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:36] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 02 9c 04 af Register0: 668 Register1: 1199 Checksum: 0x78ae - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:36] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 03 5c 04 af Register0: 860 Register1: 1199 Checksum: 0x796e - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:37] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 04 b0 04 af Register0: 1200 Register1: 1199 Checksum: 0xb9ef - OK >>>>(send M3 S10000) ---------------------------------------------------------------------------------- [14/09/2023 15:36:49] Modbus Response (COM11) Address: 1 Function: 6 (0x06) - Write Single Register Address: 513 Value: 1666 Checksum: 0x5a73 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:50] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 05 c2 06 82 Register0: 1474 Register1: 1666 Checksum: 0xd975 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:50] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 06 6f 06 82 Register0: 1647 Register1: 1666 Checksum: 0x48d0 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:50] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 06 82 06 82 Register0: 1666 Register1: 1666 Checksum: 0xd8e5 - OK >>>>(send M5) ---------------------------------------------------------------------------------- [14/09/2023 15:36:58] Modbus Response (COM11) Address: 1 Function: 5 (0x05) - Write Single Coil Address: 75 Value: 65280 Checksum: 0xfc2c - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:58] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 06 45 06 82 Register0: 1605 Register1: 1666 Checksum: 0x6918 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:58] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 05 8c 06 82 Register0: 1420 Register1: 1666 Checksum: 0xb962 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:36:59] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 04 cd 06 82 Register0: 1229 Register1: 1666 Checksum: 0xe88a - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:00] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 00 51 06 82 Register0: 81 Register1: 1666 Checksum: 0x2994 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:01] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 00 00 06 82 Register0: 0 Register1: 1666 Checksum: 0x7845 - OK ---------------------------------------------------------------------------------- >>>>(send M3 S0) ---------------------------------------------------------------------------------- [14/09/2023 15:37:34] Modbus Response (COM11) Address: 1 Function: 6 (0x06) - Write Single Register Address: 513 Value: 0 Checksum: 0xd9b2 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:35] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 00 00 00 00 Register0: 0 Register1: 0 Checksum: 0xfb84 - OK >>>>(send M4 S7200) ---------------------------------------------------------------------------------- [14/09/2023 15:37:57] Modbus Response (COM11) Address: 1 Function: 5 (0x05) - Write Single Coil Address: 74 Value: 65280 Checksum: 0xadec - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:58] Modbus Response (COM11) Address: 1 Function: 6 (0x06) - Write Single Register Address: 513 Value: 1199 Checksum: 0x9b0e - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:58] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 00 08 04 af Register0: 8 Register1: 1199 Checksum: 0x38fa - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:59] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 02 e9 04 af Register0: 745 Register1: 1199 Checksum: 0x6974 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:37:59] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 03 a8 04 af Register0: 936 Register1: 1199 Checksum: 0x389c - OK ---------------------------------------------------------------------------------- [14/09/2023 15:38:01] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 04 b0 04 af Register0: 1200 Register1: 1199 Checksum: 0xb9ef - OK >>>>(send M4 10000) ---------------------------------------------------------------------------------- [14/09/2023 15:38:07] Modbus Response (COM11) Address: 1 Function: 6 (0x06) - Write Single Register Address: 513 Value: 1666 Checksum: 0x5a73 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:38:08] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 06 59 06 82 Register0: 1625 Register1: 1666 Checksum: 0xa8de - OK ---------------------------------------------------------------------------------- [14/09/2023 15:38:08] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 06 82 06 82 Register0: 1666 Register1: 1666 Checksum: 0xd8e5 - OK >>>>(send M5) ---------------------------------------------------------------------------------- [14/09/2023 15:38:14] Modbus Response (COM11) Address: 1 Function: 5 (0x05) - Write Single Coil Address: 75 Value: 65280 Checksum: 0xfc2c - OK ---------------------------------------------------------------------------------- [14/09/2023 15:38:14] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 05 c5 06 82 Register0: 1477 Register1: 1666 Checksum: 0x68b4 - OK ---------------------------------------------------------------------------------- [14/09/2023 15:38:16] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 01 4a 06 82 Register0: 330 Register1: 1666 Checksum: 0x586f - OK ---------------------------------------------------------------------------------- [14/09/2023 15:38:17] Modbus Response (COM11) Address: 1 Function: 4 (0x04) - Read Input Registers Byte Count: 4 Values: 00 00 06 82 Register0: 0 Register1: 1666 Checksum: 0x7845 - OK ----------------------------------------------------------------------------------