Virtual slave · Coils · Discrete · Holding · Input registers · Live read/write
When to use: Use this to learn how a Modbus master talks to a slave device. The device exposes four data tables — Coils (R/W bits), Discrete Inputs (RO bits), Holding Registers (R/W 16-bit), and Input Registers (RO 16-bit). Choose a function code, address (0–15), and value, then Execute to read or write. Enable Live to watch input registers update like real field sensors. The transaction log shows each request just like a Modbus poll trace.