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BOOSTXL-POSMGR: I want to use LAUNCHXL-F28379D and BOOSTXL-POSMGR to communicate with the encoder by BiSS-C.

Ying Zhou
Intellectual 2745 points
Part Number: BOOSTXL-POSMGR
Other Parts Discussed in Thread: LAUNCHXL-F28379D, , TIDM-1010

Hi,team

My customer have the following questions.

"

I want to use LAUNCHXL-F28379D and BOOSTXL-POSMGR to communicate with the encoder by BiSS-C.

I have confirmed that the clock can be output to C+/C- as expected, but I am debugging because I cannot confirm the ACK signal from the encoder.
The encoder used operates on 10V~30V DC. I have connected an encoder cable (BN) to the J7-5 pin on the BOOSTXL-POSMGR, but +15V is not output from the J7-5 pin.
Power is supplied from Launchpad-5V to BOOSTXL-POSMGR.
I checked the BOOSTXL-POSMGR schematic and it seems that the J7-5 pin is not connected anywhere.Is this pin supported?
Is there something wrong with me choosing the Launchpad-5V instead of the external power supply?
Please tell me how to supply +15V to the encoder and receive ACK from the encoder.

Operating environment
    Encoder: Kuebler 8.F5863.1426.C423
    Encoder cable: Kuebler 05.00.6041.8211.002M
    Power supply: Launchpad-5V (J5: 2-3 short)"

Regards,

Katherine

  • 0
    TI__Mastermind 32206 points

    Hi,

    I will have to reach out to another expert to get help answering this question.

    Best Regards,

    Ben Collier

  • 0 in reply to Benjamin Collier
    TI__Intellectual 2745 points

    Hi，Benjamin Collier

    Okay, we look forward to hearing from you.

    Regards,

    Katherine

  • 0
    TI__Guru* 91005 points

    Hello, Katherine,

    Only 5V absolute encoders are supported on the BOOSTXL-POSMGR. 

    Regards

    Lori

  • 0 in reply to Lori Heustess
    TI__Intellectual 2745 points

    Hi,Lori Heustess
    Thank you for your response and I will pass on your response to my customers.
    Regards，
    Katherine

  • 0
    Prodigy 50 points

    Hello Lori, thank you for your response.
    I am the customer who asked Katherine this question.
    I have one more question.
    I already bought a 10-30V drive encoder and BOOSTXL-POSMGR, so I would like to somehow achieve BiSS-C communication operation with this combination.
    If I don't use the BOOSTXL-POSMGR (J7-5pin) to power the encoder and supply 10-30V power directly to the encoder, will it be possible to use encoders other than 5V?
    I thought that the +V voltage would not affect the BOOSTXL-POSMGR as long as it was a one-way communication without using a position reset using the SET signal.
    Regard,
    Yukako

  • 0 in reply to yukako_kamataki
    TI__Guru* 91005 points

    If the RS485 line drivers on the BOOSTXL_POSMGR are compatible with the encoder then I don't see any issue powering the encoder separately. You probably will need to have a common ground connection.  

  • 0
    Prodigy 50 points

    Thank you for your response.
    I'll try it.
    Regards,
    Yukako

  • 0
    Prodigy 50 points

    Hello Lori,

    It took me a while to check the operation and the specifications of the encoder, so I couldn't answer, but I haven't solved it yet, so let me ask you an additional question.

    Kuebler 8.F5863.1426.C423 is written as a BiSS-C Encoder example in TIDM-1010 Design guide (JAJU533.pdf) Section3. I read the documentation and thought that TIDM-1010 and Kuebler 8.F5863.1426.C423 could do BiSS-C communication.

    I measured the C-/C+ output from the TIDM-1010 and it was 1V to 3V. Encoder BiSS interface - Signal levels are L=1.3V and H=3.8V. Does it mean that the RS485 line driver in BOOSTXL_POSMGR (TIDM-1010) doesn't support the encoder?

    I purchased the following hardware environment described in JAJU533.pdf. Please let me know if BiSS-C communication is possible in this environment.

    Regards,
    Yukako

  • 0 in reply to yukako_kamataki
    TI__Guru* 91005 points

    To my knowledge the documentation is correct and this encoder was tested. 

  • 0
    Prodigy 50 points

    Hello,
    Thank you for your reply.
    As a result of having the encoder manufacturer look at the waveform, they answered that the encoder driver may be broken.
    I will close this matter.
    thank you for your kind response.

    Regards,
    Yukako

  • 0 in reply to yukako_kamataki
    TI__Guru* 91005 points

    Thank you for letting us know. 

    Best regards

    Lori