RS485 communication

Projects General Guidance
1

Helloo everyone!

Im working in a project of data mesurement insertion of a MAGNETOSTRICTIVE LEVEL PROBE using RS485 communication , the probe use power supply of 12-30v in the electronic board and for that ive used a psu with 12v ( +Vcc and the 0 Vcc) and the rest of the cables (A and the B) directly to the rs485 converter.

The probe seems powered on but their is no communication between the converter and the probe (ive used putty ,serial port monitor and realterm) even the converter driver is installed and the cables are well connected (from the probe documentation).

heres the linik of the probe's technical guide:Probe's DOC

Im waiting for your help and thank you in advance.

2

are you using a USB-485 dongle to connect your PC to the probe
I tend to use a FTDI USB-RS485 but there are plenty on EBAY

show us a photo of the setup?

what are you planning to do with a microcontroller? which microcontroller?

3

thanks for the reply.
im using ch430 microcontroller for getting data from the probe mesurement (analog data)

heres the link of the usb converter :

IMG_2773
IMG_27731920×2560 410 KB

IMG_2775
IMG_27751920×2560 515 KB

IMG_2778
IMG_27781920×2560 204 KB

4

With RS-485 it's recommended to also connect GND and mandatory to control the transmission direction.

5

so i should connect all the conductors?
A ,B GND and the input voltage 5V

6

It's output voltage, leave unconnected.

7

Always open to interpretation, but:

image
image1000×1000 90.8 KB

Second image shows the 5V as an input, not an output.

8

I'd check for an output voltage with USB connected.

9

Exactly idk if its output or input
Also normally the usb will turn on blue when i connected all the wires but not in this case

10

Do you have an idea how ?

11

Volt meter

12

If output it shows 5v right? (sorry im weak in those stuff)

13

Right.

14

Thank youu

15

@jonah2xm Figured it out?

16

No same problem even when i tried 5v input

17

Did you first use a voltmeter? Is there voltage present with nothing attached?

18

Yes i used it and no voltage is showed

19

Then it's very likely truly an input, or it's failed for some reason. Let's assume it's an input. Give it 5V, and connect ground as well. Now what happens?

20

Same thing nothing happend,i think it's broken