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I missed that in my diagram - the drivers and the MCU are part of the same unit and share their power supply. Looking at the unit from outside, one shouldn't care if it's on or off in terms of data flow. The data would flow from port A to port B either through the MCU or directly through S1.
Re: Multiplexing RS232 signal
Hi,
This is the basic idea I had in mind
My main supply is 5V, and when it is off I want S1 to close so the RS232 interfaces could still communicate.
In other words - when this unit is on the data should go through the microprocessor and when it is off it...
Multiplexing RS232 signal
Hello,
I have a system with two RS232 ports.
I wish to have the option to multiplex each of these signals.
When my system is ON, I want my signal to go through a microprocessor.
When my system is OFF, I want the signal to go form one end to another.
Which means I need...
After looking at some different devices' specs, it seems almost none of them are using DSR and DTR (industrial end point devices, sensors and such).
So I think sampling the Rx and Tx lines is a good idea.
I'll try the timeout method.
Thanks
Hello,
I want to build a device that would tap an RS-232 line between two machines, and would signal me if one of them is disconnected.
The first thing that came to mind was to use the RS-232 DCD (Data Carrier Detect), but I wonder how common is the use of this signal, since I have seen that...
Hi all,
I have a unit that needs to withdraw data from an OPC (Classic) server.
I wonder what type of OPC client should I implement on that unit.
Can an OPC UA client communicate with an OPC Classic server?
Do I benefit from implementing OPC UA client instead of OPC classic?
Thanks,
Or
Hi,
First of all thanks for the solution.
One thing that concerns me about this solution - the 5V DC supply on my board may get interfered with the signal frequency (several kHz).
Hello,
I am designning a circuit that would sample a certain voltage between -3 to 0, and ouput 3.3V if the input is above certain threshold and 0 if it's undr it.
I thought of using a comparator such as LMV339, but it does not supports a negative threshold.
Any suggestions as to what type of...
That's something I wasn't thinking of. Since it is easy to try I will test it.
In the meanwhile I found this: https://goo.gl/zedJzO
It's something called a PicoUPS, and it's almost what I am looking for (I need 5V power supply and I am trying to avoid putting a voltage regulator).
Thanks,
Or
That's an option.
I thought of this solution, but I thought that a relay may not be quick enough to switch and I need an immediate response.
If you know of a good relay that does that especially for FPGA/MCU boards, I open for suggestions.
Thanks,
Or
Hello,
I am looking for a module that selects automatically between the main power supply (DC supplier), and the backup supply (battery) when my main source is off.
I tried searching for mini power converters or BMS but didn't find what i needed.
If i had more time I would design one myself...
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