ModbusBB: Modbus TCP RTU Tool

ModbusBB is a professional Modbus master, slave simulator and diagnostic tool for Android. Read and write PLCs, energy meters, inverters, drives and sensors over Modbus TCP, UDP, RTU over TCP, USB RS-485 adapters and Bluetooth, right from your phone. Made by the team behind ModbusBB for Windows, it opens the same workspaces and register maps, so you can prepare at your desk and troubleshoot on site. ★ CONNECT TO ANY MODBUS DEVICE • Modbus TCP, Modbus UDP and RTU over TCP on Wi-Fi or Ethernet • Modbus RTU over USB OTG RS-485 adapters (FTDI, CH340, CP210x, PL2303, CDC-ACM) • Modbus RTU over Bluetooth SPP adapters (HC-05, HC-06) • Several connections at once, each with its own poll tabs • Automatic reconnect, timeouts, retries and RTU inter-frame timing ★ READ AND WRITE REGISTERS • Coils, discrete inputs, holding registers and input registers (FC01, FC02, FC03, FC04, FC05, FC06, FC15, FC16) • 11 data types: signed/unsigned 16, 32 and 64-bit, Float32, Float64, hex, binary and strings • Four byte orders (ABCD, DCBA, BADC, CDAB), scaling, offset and engineering units • Name every register and keep it with the workspace • 0-based or 1-based (Modicon 4xxxx) addressing ★ TROUBLESHOOT LIKE A PRO • Live TX/RX traffic monitor with hex frames, timing and filters • Unit-ID scanner: find which slave IDs answer on a bus • Register scanner: find readable address ranges • Device tools: FC08 diagnostics, FC17 report server ID, FC43/14 device identification, FC22 mask write, FC23 read/write • Raw frame sender for any function code • Clear Modbus exception messages (illegal address, slave busy and more) ★ SLAVE SIMULATOR • Turn your phone into a Modbus TCP, UDP, USB RS-485 or Bluetooth slave • Several unit IDs, editable registers, fault injection and device identity • Test SCADA, HMI and PLC programs without the real device ★ RECORD, CHART AND EXPORT • Record values for hours, even with the screen off • Trend chart with zoom, pan and normalized view • Export CSV in the same layout as ModbusBB for Windows ★ ALARMS • Rules for high, low, range, equal and on-change conditions • Notifications, alarm sound and automatic write actions • Event log with CSV export ★ DEVICE LIBRARY • Ready-made register maps for common energy meters, inverters and drives (Eastron SDM120/SDM630, Carlo Gavazzi EM24, Growatt, ABB ACS580, Schneider Altivar and more) • Import and export register maps as CSV or JSON • Open and save ModbusBB .mbws workspaces shared with the Windows app FREE AND PREMIUM Free: one Modbus TCP/UDP connection, read and write in every data type, traffic monitor, device library and the demo device. Premium (monthly, yearly with a 7-day free trial, or a one-time lifetime purchase) unlocks several connections, USB RS-485, Bluetooth, scanners, device tools, raw frames, the slave simulator, recording, chart, alarms, import/export, and removes ads. PRIVACY Your Modbus data never leaves your phone. No account needed. Perfect for automation engineers, electricians, solar installers, HVAC and building-management technicians, system integrators and students learning Modbus. Questions or a device you want in the library? Write to [email protected]