Announcement HowTo fix auto-negotiation problems on PicoCOM

      HowTo fix auto-negotiation problems on PicoCOM

      After spending a lot of time and effort on a problem some customers objected with auto-negotiation on the PicoCOM1 and PicoCOM2 modules, we now have found the solution to solve this behvaiour. Fortunately there are no hardware changes required on the modules itself. To correct this problem it is just required to rotate the ethernet transformator on the base board at 180 degrees, so that the common-mode rejectors are at the ethernet connector side. This fully resolves the issue without further changes.


      Please remember to follow this design rule during developing your own base board. The latest schematic available at our homepage already includes this change. Additionally we have created a short guideline for routing the ethernet signals on your base board (Ethernet routing guidelines).

      To get the modules working with our starterkit we offer the possibility to submit a RMA request that will be handled *for free*. A RMA request can be claimed at: <!-- m --><a class="postlink" href="http://rma.fs-net.de">http://rma.fs-net.de</a><!-- m --> .
      If you are intended to modify the starterkit yourself please send us a short email at <!-- e --><a href="mailto:support@fs-net.de">support@fs-net.de</a><!-- e -->, including your customer-number you received during registration at the online shop. We will sent you you a new transformator to replace the current one immediately.

      Your F&S support team

      Resources:
      Ethernet routing guidelines: click here
      RMA request page: click here
      PicoCOM1 starterkit schematic: click here
      PicoCOM2 starterkit schematic: click here
      Software developer, F&amp;S Elektronik Systeme GmbH
      As this is an international forum, please try to post in English.
      Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

      Re: HowTo fix auto-negotiation problems on PicoCOM

      Meanwhile all starterkits we deliver are updated. If you are not sure if you still have an "old" starterkit the fowlling images illustrate how to verify this.

      If the pin 1 marker of the transformator is oriented near to the J1 connector you have to switch it.


      Pin 1 must be oriented to the RJ45 ethernet plug as shown in the figure below.


      Your F&S support team
      Software developer, F&amp;S Elektronik Systeme GmbH
      As this is an international forum, please try to post in English.
      Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.