Modbus is a request/reply protocol that has one Modbus client in its network and may have many Modbus servers. Servers can control only their own internal states, and clients can read and write data in them.
Each Modbus server has four tables in which it can store data.
| name | data range in one field | permissions for client |
|---|---|---|
| Discrete Inputs | 0-1 | Read |
| Coils | 0-1 | Read/Write |
| Input Registers | 0-65535 (0xffff) | Read |
| Holding Registers | 0-65535 (0xffff) | Read/Write |
The Modbus API provides some common API to access the Modbus devices:
As part of the free Business evaluation, we offer a free welcome call for companies, to talk about your requirements, and how the Felgo SDK & Services can help you. Just sign up and schedule your call.
Sign up now to start your free Business evaluation:
