Welcome to Synthiam!

The easiest way to program the most powerful robots. Use technologies by leading industry experts. ARC is a free-to-use robot programming software that makes servo automation, computer vision, autonomous navigation, and artificial intelligence easy.

Get Started
Asked — Edited

Connect Not Card


Unable to connect the card.

Attempting connection on COM4
Comm Err: The waiting period for the transaction has expired.
BbytesToExpect: 1

Connection Failed: System.Exception: Controller Not Responding
    to EZ_B.EZB.Connect (String hostname, String tcpPassword, Int32 baudRate)



Upgrade to ARC Pro

Your robot can be more than a simple automated machine with the power of ARC Pro!

AI Support Bot
Related Content
I am sorry you are having problems. Have you already tried the tutorial on how to connect it?


I remade the procedure is always the same error message.

The Bluetooth works well, but the LED flash card that is not fixed.

I have this card from one who works more for a week.

Connection errors usually are resolved by making sure you have native Microsoft Bluetooth drivers installed in Windows and not 3rd party drivers. Make sure this is the case and retry. There has been a lot of people with this same issue that get connected just fine after changing to the native Microsoft Bluetooth drivers. If you do a search on this forum you will see them.

Thank you for your help.

I redo the procedure is always the same error message.

The Bluetooth works well, but on the map v3 EZ-B LED is not fixed it.

I have this card for more than one year but no longer works for one week from the version change.


United Kingdom
Are you sure it's the correct COM port?

Waiting time has expired which to me seems like the EZ-B is not listening, or not hearing the PC. This is either the wrong COM port selected, the EZ-B is too far from the PC or the EZ-B is not turned on/bluetooth is not powered.

Check your com port
Check your power supply
Check the distance the EZ-B is from the PC
Check if anything else may be interfering with the signal
Check the bluetooth module is correctly and securely fixed to the EZ-B

The recent updates should not make any difference to the connection, that part has not been altered.

Were you able to find a solution to your challenge? If not, did you originally start the firmware update and then stopped it before it was finished? Or have you been getting these messages from the beginning?