defcon.klaxon
Lifetime Supporting Member
Hello all,
I am working on getting a Hach particle counter set up over a serial to ethernet adapter. We need to move the counter to another building so that the sample point is before chlorinators, long story short. The particle counter data comes in over RS-485, two-wire and gets converted to RS-232 at the PC that runs the interface software.
Between my lack of experience with RS-485 and a mess of adapters that used to work but now they're not sure what does and doesn't work, I'm having a bear of time sorting out everything for testing.
To the point, I'm trying to determine is there is a way to perform a loopback test on RS-485 two wire. I can find everything in the world about RS-485 four-wire loopback, but not on two-wire. I'm thinking it could, in theory, be as simple as putting a jumper between the + and - terminals but wanted to verify with someone who knows more than me. The distinct lack of Google search results with this potential solution being suggested has me worried that I may damage something.
I am working on getting a Hach particle counter set up over a serial to ethernet adapter. We need to move the counter to another building so that the sample point is before chlorinators, long story short. The particle counter data comes in over RS-485, two-wire and gets converted to RS-232 at the PC that runs the interface software.
Between my lack of experience with RS-485 and a mess of adapters that used to work but now they're not sure what does and doesn't work, I'm having a bear of time sorting out everything for testing.
To the point, I'm trying to determine is there is a way to perform a loopback test on RS-485 two wire. I can find everything in the world about RS-485 four-wire loopback, but not on two-wire. I'm thinking it could, in theory, be as simple as putting a jumper between the + and - terminals but wanted to verify with someone who knows more than me. The distinct lack of Google search results with this potential solution being suggested has me worried that I may damage something.