Prabhakarankft
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Just We have a AC motor( 3 Phase). Induction wise no problem I thing .
Does this communication occur between periphreal board and a PC desktop/laptop? If so, is it done through a USB adapter or something else? Do you have a diagram of the electrical scheme you can show?
Carrying 3v3 across a 4,5m cable, how can you be sure? BTW, it would be advisable think of using logical address to each device through serial protocol instead of a low level signal acting as device 'selector'. The RS-232 electrical standard is more suitable to deal with devices apart each other.
**broken link removed**Hi,
Show the exact circuit...from master side...which IC, which pin drives which line of which cable...and the complete slave receiver circuit.
ESD protection including wiring and PCB layout.
Connectors, if used....
All GND (and Earth) connections to recognize a loop.
Why 5A? What's the return path of the 5A? Hopefully not the signal_GND of the RS232....
How is the motor involved?
How is the power supply involved?
Why the headline talks about 3m while the text says 4.5m?
What exactly means: "communication is not happening"? Fault at the master side or slave side? How do the signals look like? Idle level, active level...
Klaus
Hello,
Thanks FvM.. You are exactly correct. I will correct in PCB manually and I will let you know..
For your information I am using 5V VCC.. If I use 0.47uF capacitor don't be problem right???
Otherwise Shall I use 0.1uF AEC disc capacitors as Everyone using.. I hope baud rate is not big for our application. Just We sending 2100 Bits/RPM(120 RPM max speed)
Previously We have used 0.1uF capacitors but We could not find any difference in that. Suggest some links to Test( Testing procedure or Test must do) the PCB before delivering to client end
Hi,
It's all very confusing ... at least to me...
You gave just a little snippet of information/schematic of what I asked for in post #3.
This makes helping difficult/impossible ....
I assume you have good reasons not to give some informations...thus I don't ask again.
***
Just one example:
We are not able to check the voltage drop across the GND line of the cable, because:
* we don't know cable type and wire diameter
* return path of power
* we are confused if there is 5A, or 0.5A. Average or pulsed?
* whether the connectors are suitable
With your last post some more questions arise:
* Why do you use a shielded cable, but don't connect the shield?
* you give a variable data rate, depending in RPM.... don't you use a fixed baud rate?
* if no motor is used, why do you talk about RPM at all? (As far as I understand: No motor --> no RPM --> no data transfer)
* how the solenoids are involved
* why that big 23A SMPS?
* your schematic shows unconnected input pins at the RS232 driver...are you sure they are not floating?
Klaus
From your other post:
Why do you say "It is not having any internal ESD protection diodes", while tha datasheet on the first page and other pages specify ESD rating. Maybe you use other manufacturer than SIPEX?
I don't believe that any datasheet shows the V- bypass capacitor reversed, your schematic however does:
View attachment 153950
No urgent need to measure...but measurement gives exact values with your exact conditions...We could not measure the voltage drop
If 5A (or 0.5A) goes the one way, it has to come back somehow...this is the return path.Return path of power is same Core cable. VCC and GND lines are separately given. I am not getting exactly what you mean by Return path of power. But for power We use only two lines
Not as long as they comply with your requirements...current, resistance, voltage, voltage drop, thermal...Is there any problems with RMC connectors?
Should work.24576 baud Rate
ESD grade depends on your environment ... we can not say what may happpen...So shall We confirm this is not due to ESD??
Hello FvM,
Kindly find attached image. SP3232 IC pin configuration is slightly differs from MAX3232 Check at 6th PinView attachment 153949
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