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Hi
Thanks for your inputs. My answers
1. The modules are connected in Daisy chain. To simulate in orcad we done like this.
2. Both Ends we are terminating 120 ohms
3. Yes Slave modules has independent power supplies and that ground is connected to Master ground using 100 ohm resistance...
Hi Brian
I have connected third wire to DC ground. Only i have removed the DC ground shorting the Earth. Pl find the voltage and current measured and wiring diagram how the devices are connected.
Hi Klaus
I have attached the voltage/ current analysis and wiring of modules. Pl comment...
Hi all
I have encountered the problem again after removing the DC ground to earth connectivity. I will put my observations at time of failure
1. The IC case( die) is getting heated up initially.
2. Gradually the the temperature is rising up and blows up the IC but even the IC is...
HI i am facing one of main issues in this circuit. The LED lamp is glowing once the opto stop conducting. Means the Zener makes the path of current flow to load. Is it any way to stop this?
Sorry Mr. Brain for late reply. Yes we are running a signal ground which has terminated with 100 ohms resistors to DC ground.
Secondly i faced one more issue recently. The protection diode was not there for A & B of 485 chip. The environment was clean and we found the chip is blew away. what...
From process point of view one small suggestion Possible reduce the width of nets in some portion. Example is rounded in attached pic. So while in manufacturing the not solder issues due to insufficient heat will get avoided.
Sorry part no is TPD2E007DCKR2
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Thanks for your reply. No it is normal electrical EARTH and it connected to Power supply GND point
Can you explain me or give hint where the voltage level has no clear understanding so it will be better for my debugging
Yes. All Earth is...
Thank you so much for your reply. We are installing system in big apartments which is under construction. Environment condition with be 30 to 40 deg celsius & 60 to 70 % humidity. Part no is . DC ground to earth is to take care of EMC for RF signals for RC in parallel. Direct connection is...
We have a circuit which master RS 485 module is designed as fail safe mode and (DC GND) connected directly to Earth. It communicates to other RS 485 modules in daisy chain connection with/ with out end node termination & this modules are connected (DC GND) to earth via a RC in parallel network (...
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