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POST No. 21999
Strange questions about RX-28 and RX-64
2010-04-15 15:51:00

Hello,

    I've got a problem with RX-28 and RX-64 that really bother me. Followings are the questions that I summerize from the phenomenon:

    1 Will the motors produce any noise or signals when the load on the motors are too strong ? If so, will these noise or signal finally affect the 485 bus, so that other motors linked by the 485 bus can't receive the right command ?

    2 Do the motors have the ability to protect themselves when they find the signals on the 485 bus are too noisy ? I mean, if the signals on the 485 bus are too bad, will the motors try to reset themselves, ie. the ID and the baudrate to the factory defaults ?

    The phenomenon is discribed here. When the robot does motions on the ground (the load will be a little large), the motions are always stuck, and when this happens, then some motors will be automatically resetted. While the robot does motions when hangging in the air (the load will be small), the motions are smooth and nothing unusual happens.

    I really wonder your answers soon.

    Thank you!

Best wishes!

Zerbobo

2010-04-15 15:51:00
2010-04-18 23:00:00 MikeG
I have experience interfacing the RX servos with several different microcontrollers and serial to RS485 devices. I have not run into anything that you describe.I suspect you have an interface problem and/or a bug in your code. Consider posting a schematic and your source code. Did you properly terminate the RS485 bus on the Meag128 side?How many Dynamixels is the lithium battery powering?
2010-04-18 23:00:00
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2010-04-20 18:54:00 ROBOTIS
Dear Zerbobo 1. In normal condition, the load can not affect on the communication. The communication problem happens usually when one of the connected Dynamixels has a problem in the communication chip. 2. If the current is not high enough, it is possible that the power is turned off. However, even if the current is not high enough, it can not be reset at initial status automatically. The voltage and controller look OK (although we are wondering what the power supply from the battery is like, when you consumed much currents for big load in a very short time.) The biggest possibility is that some of the connected Dynamixels have a problem. Pleaes check each Dynamixel one by one after disconncting. ROBOTIS
2010-04-20 18:54:00
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