STX-AG400 is new Stonex Auto-Steering System that integrates GNSS positioning with automatic control technology to ensure an operational accuracy of ±2.5 cm, even in complex terrain conditions. It is compatible with a wide range of agricultural machinery, including tractors, transplanters, sprayers, harvesters and, thanks to ISOBUS protocol, with multifunctional farm implements.
STX-AG400 Auto-Steering System offers modular solutions for precision farming, ranging from simple manual guidance (STX-AG400 Lite version) to advanced implement control via ISOBUS protocol. Install the system without the need of hydraulic circuit HW modifications and be-ready to work in less than 30 minutes.
The intuitive Android Auto-Steering software makes the solution simpler to use, increasing the productivity and optimizing the working time. Guide automatically the tractor on straight, curved, pivot or mixed routes on various terrain, executing low-speed tasks, and performing high-speed operations.
Use the free U-Turn functionalities to optimize the tractor route, calculating automatically the correct turning radius to perfectly align with the next lane.
Compatible with all machines. ISOBUS UT, TC-SC, TC-GEO, TC-BAS & AUX protocol
SIMPLE INSTALLATION: no hydraulic modifications
Different work patterns. AB straight line, A+ line, curve, pivot, mixed route, headland, diagonal.
±2.5 cm RTK accuracy. Works on sloping terrain, executing low-speed tasks, and performing high-speed operations

AG400 Auto-Steering software is designed for Android platform to be simpler and intuitive. Among its main features, it’s necessary to mention:
Basic and Smart U-Turn functionalities

AG400 Auto-Steering System offers modular solutions for precision farming, ranging from simple manual guidance: AG400 Lite version.
AG400 Lite is a facilitated visual guidance system for agricultural machines. Thanks to the dedicated software it is possible to set and monitor the vehicle’s route efficiently and precisely. The software allows to choose one of the predefined routes, and various work modes are available
The intuitive Android Auto-Steering software makes the solution simpler to use, increasing the productivity and optimizing the working time.
Guide automatically the tractor on straight, curved, pivot or mixed routes on various terrain, executing low-speed tasks, and performing high-speed operations.
For Android devices
User friendly interface
Tractor and Implements Configuration & Calibrations
The solution STX-DIG (2D module) determine the direction/heading using two passive antennas set on the cabin roof. The passive antennas are connected with a dual Antenna GNSS Receiver integrated into the Android Tablet. The tablet provide just the heading when it is used in 2D and stand-alone way (without the use of any correction). Without any correction (Ntrip or Base) the GPS sensors will be use only like a compass heading. In this way it is possible to know the Excavator Rotation with a precision of 0.2°
In 1D or 2D module, when the excavator is moved, the operator use the laser receiver installed on the stick to the laser reference plan when he moves the excavator.
The 2D ½ module use the NTRIP signal to get elevation through the GPS antenna. In this way the operator does not need any Laser Receiver on Excavator Stick and Laser Level.
The main characteristics of the angle sensor are speed, reliability and reduce dimension:
The sensor can be fit on the machine using a weld Bracket Place (included in the solution)
Yes, it is.
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