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XC44 address tag error / no contact

Pawel Pekala 1 week ago in Expansion modules / XC4x • updated by Gustav Widén (System support) 5 days ago • 6

Hi Gustav,

We are experiencing issues with XC44 reporting no contact error and ID tag LED error.

Test bench system consists of the following:

  1. MD4-10 (6.08.24.8051):
    1. Adress tag 1
    2. Can bus A – terminated
    3. Can bus B – not used
    4. Can bus C – not used
    5. Can bus D – not used
  2. XC44 module:
    1. Address tag 2 (pin 4 and 20)
    2. Can bus A – terminated
    3. XC44 original harness on C1 and C2
    4. No inputs, no outputs for testing purposes.
    5. Tried different, known address tags
    6. C1 pins have been verified.

Pushing the project to the MD4 has not fix the problem. We tried the same setup with IQAN 7 – same results.

Our field service started reporting same issues in the field where the XC44 is reporting no address tag errors.

Theo 1 week ago

Are you using original adress resistors or did you buy normal resistors?

you should use metalfilm resistors with 1% tolerance.

it can be that you XC44 module needs a software update... it should be done automatic when you load the software to the MD4 and the XC44 is connected to the can bus.. 

Pawel Pekala 1 week ago

We are using IQAN physical resistors. No matter how many times we push the software, the XC44 still gives the same fault. 

Theo 1 week ago

try disconnecting the XC44 first send the software and than connect the XC44

wait a couple of minutes... and connect the xc44 again, also check the resistor value.. i also have problems with the first startup but after a couple of times on and off back and forward with resistors they always end up working.

Image 4678

Theo 1 week ago

did you also twist the can-bus wires ? make it a twisted pair i mean?

Pawel Pekala 1 week ago

Here is what we found after diving a bit deeper into this issue. 

We determined that the C1 connector would not always seat all the way due to resistance from the rubber seal. Even with locking mechanism in place, the connector still had to be pushed in order to seat correctly. 

Interesting. 

Theo 1 week ago

yep those connectors are not the best choice i rather have the deutsch version.

lucky you found it 

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