Adapter Cable for External Target Rate

John Deere sprayers are compatible with the Yara N-Sensor (former Hydro N-sensor) to enable variable application of liquid fertilizer. Although the N-sensor is not delivered by John Deere, customers may use the sensor with their John Deere sprayers. The Yara N-Sensor continuously measures the biomass and the chlorophyll contents of the crop and calculates the optimum nitrogen amount for each individual part of a field. The required nitrogen level of cereal crops for the second and third application is determined by the nitrogen sensor and send to an additional controller (WTK-Terminal) that translates the sensor data into an application rate. The N-sensor controller can be linked to the EL-4 control box through the RS-232 serial connection and sends the target rate to the sprayer controller. The John Deere EL-4 controller adjusts the target application rate to the measured value of the nitrogen sensor "on the go". The actual application rate is transmitted back to the N-sensor controller (WTK-Terminal) for documentation.

When the target application rate should be adjusted via a external source, connect (A) to the EL-4 control box and connect the RS-232 (B) to the external device.

To accept an external target rate from the N-sensor, the RS-232 communication needs to be enabled in the machine settings of the EL-4 Controller.

Switch on the device by pressing the "PRO" key once (the software version and serial number will be displayed) and wait 5 seconds until the normal working display appears. Check whether switch "M" of the master shut-off valve is set to "off". Press and hold down both keys "+" and "-" simultaneously and then press the "PRO" key twice to enter the machine program (PRO SYS).

A-Connector for N-sensor connector (WTK) on EL-4
B-RS-232 communication port on (WTK)

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If the EL-4 controller has a communication connector and the communication feature is enabled by the factory, then an extra programming step is available in the machine setup. In this step you have to select the function of your communication port.

The following communication functions can be programmed:

• No Com : Communication port not used
• PRT : Communication port used for printing (not available)
• GPS : Communication port used for GPS and N-Sensor
• LOG : Communication port used to log on an external PC (not available)

Use the "+" or "-" key to select the required type of regulation. Always enter "GPS" to accept an external target rate when using the sprayer with N-sensor. By pressing the "PRO" key, the setting will be accepted.

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