Wiring RS485 / PID.

[aamcle]

Evening All.
I've finally managed to set up a virtual com port on my old net book, this should alow it using the appropriate software to control my PID.

The PID outputs data+ and data - I need to connect them to a standard network socket (rj45 socket) which pins should I connect the to?

The software for the PID will let me programme it and display graphs of what's going on, I'm looking forward to that.

Many Thanks. Aamcle

 

[crane]

Standard network cable has 4 twisted pairs all matched by color. One wire of the twisted pair will be a solid color like green. It's other half of the pair is the white one with a green stripe. RS485 is a differential pair so you want to connect the + and the - to one of the twisted pairs.

 

[aamcle]

Thanks Crane, but I'm still stuck.

On my PID connection 11 is - Data and 12 is + Data and I have to connect wires to them they are not prewired just screw terminals.

If I connect a wire to 11 - Data which pin in the RJ45 Socket (wall plate) should it be connected to?
What about connection. 12 + Data which pin does that go to?

Thanks Again. Aamcle

 

[crane]

Hmm. Are trying to connect RS485 to your local network? If so that won't work. They are 2 completely different and non-interchangable protocols.

 

[BillKlineVT]

Might be able to interface with it using one of these usb to rs485 adapters, but you'd have to get a driver and interpret the code from there. http://m.ebay.com/itm/like/121457862411?lpid=82&chn=ps

 

[crane]

I use this RS485 to USB adapter for my automation direct PID. Works fine with their SW to configure it.

http://www.amazon.com/gp/product/B009SIDMNM/?tag=skimlinks_replacement-20

 

[muhteeus]

Don't forget your terminating resistors!

 

[aamcle]

I have a RJ485 adapter/Virtual com port unit that plugs into a USB port it has a RJ45 receptacle (female socket). It's USB one end and RJ45 at the other.

I now need a cable to run from it to a socket on my control box and to wire the pid to the control box socket.

My plan is to use a network cable to connect the RJ45 Female socket in the RJ485 adapter to a Female Socket mounted on the side of the control box.

That part of it should be OK.

My PID has outputs for +Data and -Data but I still need to connect those outputs to a female RJ45.

This is were the problem lies, I don't know which pins on the socket to connect then to!

Atb. Aamcle

 

[aamcle]

Sorted I hope! I've finally found enough details of the adapter to let me when wire up.

Thanks. All. Aamcle