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

Ying Zhou

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

over 1 year ago

0 Benjamin Collier over 1 year ago

TI__Mastermind 29816 points

Hi,

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

Best Regards,

Ben Collier

0 Ying Zhou over 1 year ago in reply to Benjamin Collier

TI__Intellectual 1255 points

Hi，Benjamin Collier

Okay, we look forward to hearing from you.

Regards,

Katherine

0 Lori Heustess over 1 year ago

TI__Guru* 90455 points

Hello, Katherine,

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

Regards

Lori

0 Ying Zhou over 1 year ago in reply to Lori Heustess

TI__Intellectual 1255 points

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

0 yukako_kamataki over 1 year ago

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 Lori Heustess over 1 year ago in reply to yukako_kamataki

TI__Guru* 90455 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 yukako_kamataki over 1 year ago

Prodigy 50 points

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

0 yukako_kamataki over 1 year ago

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 Lori Heustess over 1 year ago in reply to yukako_kamataki

TI__Guru* 90455 points

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

0 yukako_kamataki over 1 year ago

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 Lori Heustess over 1 year ago in reply to yukako_kamataki

TI__Guru* 90455 points

Thank you for letting us know.

Best regards

Lori

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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