Learn how to troubleshoot a two-wire no response message.

Summary

In the event of an isolated two-wire device communication failure, where a single device message is present over a large section of two-wire, read what's below for added information and resolution steps. 

Check the Message

Check that the message lists a specific device in the error. Device messages with wording like "No reply," "No response" or "Two-wire communication failure" indicate a problem with two-wire communication. You can see the device ID at the bottom of the error screen.

Problematic Splices

The splices on the biCoder could be corroded, the result of water intrusion due to improper splice hardware or otherwise. The correct splice hardware is the 3M DBR/Y-6 connector, in the provided waterproof capsule. This is the only splice hardware that meets specifications, and is included with every decoder set. They CANNOT be reused, so ensure to bring a new set if you need to replace the splice.

Malfunctioning Decoder

The decoder may be faulty, which can be seen by looking for the LEDs on the top of the decoder. If none are present when the decoder is in operation or when running a test of that device from the controller, Mobile Access or BaseManager, take the decoder to the controller. Plug it directly into the controller without the two-wire path, and verify if the decoder is the issue via test from the BaseStation test menu.

Required Tools

#2 Phillips screwdriver

Wire stripper

Process Steps

1. Turn the dial to Self Test and run a check of two-wire addresses. This eliminates any device address issues that may be present. Re-test the two-wire device after checking the addresses. If communication still fails, proceed to step 2.

Note: On a BaseStation 1000 or SubStation, the two-wire address check is baked into the search function. For these controller types, run a device search then re-test the individual device. 

2. Pull two-wire device from the wire path and valve box and bring to controller.
3. Disconnect all other two-wire from controller, connect two-wire device and perform a device test from the BaseStation test menu.
   1. If test returns a communication failure, two-wire device must be replaced. 
   2. If test returns on okay status (Or open circuit solenoid if testing a valve biCoder with no connected solenoid), re-splice two-wire device into original field location. Before re-splicing, confirm you are using new DBR/Y-6 connectors. While re-splicing, ensure the wires are not loose in the wire nut, the wire nut is pushed to the rounded base of the grease cap. Before closing the valve box, ensure that the rounded base of the grease caps are pointing up. See Baseline Wire Connection Specification on page 6 of Baseline Two-Wire Technical Specification.

If you check all of the preceding steps and fail to resolve the issue, consider contacting Hydropoint Support. Hydropoint Support can be reached at support@baselinesystems.com, support@hydropoint.com or 866-294-5847.