Overview

This error means that the field unit (C3, Solo, Pico, etc.) is unable to communicate with the device (soil probe, weather station, level sensor, etc.) that is connected to it. In other words, it can't talk to the sensor or hear back from it. Most of the time, this is due to a cabling issue.

The error can be identified from Monitor:

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It can also be identified in Manage Equipment:

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"Communications timed out waiting for device response" can be caused by any of the following:

Cable is not connected properly to the device or field unit.
Cabling to sensor is damaged.
The sensor is not plugged into the right port.
Cable is not the correct type.
The sensor has failed.

Resolving the Error

Loose cable connection

Check if the device is connected properly to the right port of the field unit. Make sure that the cables or wires are securely attached to both the device and the field unit, and not loose. Unplug the device and plug it back in again properly. Turn the unit off, give it a minute, and turn it back on.

Damaged Cabling

This is the most common cause for this error. Inspect the cable for any damage. Even if damage is not apparent from external inspection, a lot of times there could be internal damage that is not visible. In order to rule out this possibility, the cable should be replaced with a test cable that is known for sure to work.

Incorrect port

This will usually be true for new installations, or if a device has been replaced. If the port that the sensor is physically connected to does not match the port that is set in the software, the field unit and sensor won't be able to talk to each other.

For example, in most cases, the device is connected to the RS485 2 port, but it is configured for the RS485 1 port in the software.

First refer to the relevant Technical Note of the device to see which port the sensor should be plugged into. Then check the configuration of the sensor from Manage Equipment.

Incorrect Interface Cable

Ensure that the correct type of interface cable is used. This article details the right interface cable, along with the Item Code, for supported devices.