Hello,

Have you used the Ecowatch Software?

I would first recommend to communicate normally with the application and use a sniffer to figure the protocol operations and then use the PC as a way to transfer your information to the Arduino (in the case you have the complete system):

https://freeserialanalyzer.com/

I am not sure about the sensor, but you usually have to feed the sensor with a source (+) and ground it, and the measured reference is usually given in data?

I hope this might be useful.

Hi Bruno !

Thanks for your response. I use Ecowatch to download and save the data to my PC. However, I wish to develop one cheap multiparameter using arduino and salinity/ conductivity remains my limiting issue and I would like to use my extra YSI cond/sal. probe with arduino.

Best regards

I see,

In that case I still think that it is necessary to understand the protocol between the YSI and the PC. There is no specification on the manual about this point so I think you can sniff and bridge the RS-232 cable to your Arduino to trace the communication or understand the baudrate.

If the sensor wants to be used alone I think it might be necessary to measure the voltage levels when you are having readings to see if the + is stable and what value it is, same for GND. and see if data is changing (maybe use oscilloscope?)

I hope this could be helpful

Thanks Bruno,It seems a very good approach to understand cable configuration.

Best regards,

Luis

No problem Luis,

I hope it works, if you could give a feedback in case you decide to do it this way please let me know ;)