About 25 V is minimal voltage for short range (no relevant cable voltage drop), review EN 1434-3 and EN 13575-2. Higher voltage is possible, of course.I remember to have designed 30V supply for M-Bus master.I know I have to boost the voltage, but why 25V? Isn't it communicating with 36V/24V levels?
Did you read M-Bus basics, like the documentation?Also i don't know how to convert from mbus to usb and i couldn't find a good referance,
Yes i read the documentation but in physcial layer part i couldn't find the requirements for master devices. Also i couldn't read the necessary standards which stated in #5 by @FvM. And i am aware that my level of knowledge is limited on this area, as i mentioned im a newbie.Did you read M-Bus basics, like the documentation?
M-Bus is a combination of power supply and UART communication with voltage and current.
So all you need is a USB-to-UART converter (besides the M-Bus phy).
There are many, from bare ICs to ready to buy modules.
Circuit on post#6 does not have USB!!!Do i need to use an IC for the master module? The circuit on #6 doesn't have any.
Oh, i get it. The UART to USB has the IC. Thanks.Circuit on post#6 does not have USB!!!
Klaus
Update: Deep further the research i rast upon the circuit which made by Jens Mueller. He also wrote a design guide to help the community. I decided to change my referance design to this.So, further in the research i realised that the circuit in the #11 is not the general design. So back to the original schematic at below, i want to learn how to get the required 34V from USB. I know that i've to use boost converter but in the circuit there is a external power supply. How can i cancel the external and supply the m-bus bus from USB? Thank you for your interest.
View attachment 192662
Hi,
the regulator design makes no sense at all.
Neither the input side nor the output side circuit makes sense.
--> Better review the datasheet and it´s circuit examples.
Klaus
Did you really read the datasheet?He recommends some step-up regulators that i couldn't understand how they work.
No, they don´t.but the recommended regulators just boosting 5V to 15V
It´s like asking: I don´t understand which way to go. Isn´t the map correct.Isn't the referance design correct?
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