This manual describes the communication methods between TECO frequency inverter 7200MA and host controllers(PC,PLC…)
This application note provides the communication methods for the TECO 7200MA frequency inverter using an RS‑485 interface and MODBUS RTU protocol. It details the required wiring, parameter settings such as node address, baud rate, parity and stopping methods, and describes how the inverter responds to host controller messages.
The document also defines the MODBUS message structure, function codes supported (03H, 08H, 10H), CRC‑16 generation, and the inverter's status indications (e.g., Alarm RS‑485) when communication errors occur.
| Communication Interface | RS‑485 Interface |
|---|---|
| MODBUS Mode | MODBUS RTU mode protocol |
| Transfer Speed (Baud Rate) | 1200/2400/4800/9600 bps |
| Parity Options | no parity / even parity / odd parity |
| Node Address Range | 1 ~ 31 |
Set parameter Sn‑36 to a value between 1 and 31; this defines the inverter’s node address.
It shows “Alarm RS‑485” after 5 seconds of no communication, which clears when a message is received.
The default baud rate is 2400 bps (Sn‑37 default = 1).