How to conect WIKA DI35 digital indicator via RS 485 on PXI-8431?

[topko]

HI

Can anyone tell me, how to connect WIKA DI35 digital indicator with RS 485 on PXI 8431 board. Terminals on indicator are marked as GND (RS), B(+) and A(-) so how to connect this terminals on pins in DB-9 connector? Maybe anyone knows where to find an example or driver for this indicator? I’m using LV 7.1. Thanx for any help.

Regards, Topko

[Krista H]

Hi Topko,

Here is an Knowledge Base that shows the pin out of our DB9 Connector. GND will need to be connected to pin 5 but you will have to determine what B(+) and A(-) actually are based on your devices manual. I looked on ni.com/idnet  but I could not find an instrument driver for your DI35 device. You might check with the manufacturer to see if they provide a LabVIEW driver.

[topko]

In manuals for this indicator - there where no useful information about connection on RS 485 (you can look yourselves on their homepage that particularly manuals). I tried all possible connection combinations with no response from indicator. Now, when I reed other problems with communications, I will try with different terminate characters in any possible connection. Results will be announced in this forum as soon as I perform tests on all of combinations. I'm sorry, that  I don't have any other instrument with RS485 communication to test, so I can't be sure, if this DI35 RS 485 communication is working properly.

regards, Topko

[Dennis_Knutson]

Since you did not provide a link, I did a google search and found http://www.wika.de/pdf/betriebsanleitungen/englisch/ba_di35_d.pdf near the top of the results. On page 6, there are instructions for an RS-485 connection and section 6 describes how you can use a program such as hyperterminal to communicate. I would recomend you try that first before trying to code anything yourself.

[topko]

As you can see, there are data lines marked as A(-) and B(+) in this manuals. Do you have any sugestion on which pin in DB9 connector (TXD-, TXD+, RXD- and RXD+) this data lines have to be connected?

[Dennis_Knutson]

I'm a little rusty with RS-485 but I think this is intended to operate in half-duplex mode. Connect to the TXD+ and TXD- lines.