This document is an application manual for the TECO Frequency Inverter 7300PA MODBUS Slave Communication Interface, describing the features and characteristics of the product.
The Application Manual explains the PA‑M communication card and the Modbus (RTU) methods used to connect a TECO 7300PA frequency inverter with host controllers such as PCs or PLCs. It covers wiring, terminal functions, LED indicators, DIP switch settings, and jumper configurations.
Key sections include the inverter specifications, wiring diagrams for RS‑485 and RS‑422 interfaces, detailed parameter tables for Modbus communication, protocol and message formats, a holding‑register tag list, error codes, and an example RS‑485 communication sequence.
| Part Number | 4H300D2950006 |
|---|---|
| Serial Interface | RS-422/RS-485 |
| Maximum Connection | 32 MODBUS (RTU mode) slave |
| Baud Rate | 2400/4800/9600/19200 BPS |
| Data Bit | 8 Bit |
| Parity | No Parity / Odd Parity / Even Parity |
| Stop Bit | 1 Bit (Odd/Even Parity) / 2 Bit (No Parity) |
| Maximum Distance | 100 m |
| Mode | Half‑Duplex |
| Connection Medium | Shielded Twisted Pair Cable |
| RTS Repeater | TTL Level |
| Isolation | Photocoupler, Common Mode Rejection 50 V |
| Error Check | Cyclic Redundancy Check (CRC) |
| Access Data | All Parameters of 7300PA |
| Mechanical Size | 64 mm × 87 mm |
Up to 32 MODBUS (RTU mode) slave devices can be connected.
The inverter supports 2400, 4800, 9600 and 19200 BPS.
It displays "Call" and flashes until a message is received.
Parameter Sn‑23 sets the node address from 1 to 31, default is 1.