Poll Modbus Pro

View and change the data of your PLCs and Modbus TCP devices in real time from your phone or tablet, or turn your device into a Modbus TCP server.

CLIENT MODE
• With a WiFi or Ethernet connection, it communicates via Modbus TCP or Modbus over TCP (encapsulated RTU) using the IP address, port and slave ID of the device.
• Reads holding registers (function 03) and coils (function 01), separately or together.
• Tap a variable to write: one or several registers (functions 06 and 16), one or several coils (functions 05 and 15).
• Auto toggle: switches a bit at a set interval.

SERVER MODE
• Your Android acts as a Modbus TCP slave: a SCADA, an HMI, a PLC or another Poll Modbus connect to its IP to read and write registers and coils.
• Answers functions 01, 02, 03, 04, 05, 06, 15 and 16.
• Ideal for testing a SCADA or an HMI without the real device.

IN BOTH MODES
• Addresses in Modbus format (4xxxx, 0xxxx) or IEC 61131 (%MW, %M).
• Values in decimal, hexadecimal or binary; 16 and 32-bit integers and real (float), in normal or swapped order.
• Optional name for each variable: "Name = value" with the address below.
• Communication profiles for several devices.
• No ads.

Android does not allow opening port 502 without root: in server mode use a port above 1024 (for example 5020) and, if the client cannot change it, forward 502 → 5020 on the router.

Modbus is a registered trademark of Schneider Electric USA, Inc. This app is not affiliated with Schneider Electric.