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PICList Thread
'Grounding problems'
1998\03\23@144503 by tsk196

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Hello Engineers;
       I have a project that controls the position of the
motor. And I have managed to use PIC17C44 to control it
successfully.
       However, I had to erase the PIC whenever I wanted
to change the parameter of the PID. So I decided to make it
user friendly by having the computer to communicate with
the PIC.
       And I did manage to get the computer to communicate
with the USART of the PIC.
       But when the RS232 had the same ground as the
motor, the motor starts to go unstable. When I remove the
RS232 from the circuit, the motor is stable again.
       Does anyone of you knows what is happening?
       Thanks in advance to all engineers.
With regards,
Siong.

----------------------
Mr Teik Siong
spam_OUTtsk196TakeThisOuTspamsoton.ac.uk

1998\03\23@154035 by Michael Hagberg

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noiSe, maybe you should look at either opto-isolate the comm lines or use a
RS485 that uses differential voltages to read the signal.

michael

{Original Message removed}

1998\03\24@043433 by tsk196

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Hello Mr Michael and Baglatzis,
       I am not too sure how to opto-isolate the RS232 to
the PC? Can you tell me more abt this.
       By the way, I had some budget to meet for this
project and I have no more excess amount to buy RS485. So I
have to make do with RS232.
       Thanks for your help again.

> noiSe, maybe you should look at either opto-isolate the
comm lines or use a
> RS485 that uses differential voltages to read the signal.

>opto-isolate the RS232 to PC.

With regards,
Siong
----------------------
Mr Teik Siong
.....tsk196KILLspamspam@spam@soton.ac.uk

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