SDI-12 communication without Waterlog H-4191

Hello everyone!

I would ask you communication SDI-12. I am developing a Labview VI that could communicate with a sensor. Communication with this sensor must use the SDI - 12 Protocol.

I found that there is an already developed Labview API to do this (http://zone.ni.com/devzone/cda/tut/p/id/7726). To do this they use a (SDI - 12-RS - 232) converter and the VISA of RS - 232. The converter that is used is the H - 4191 Waterlog, however, I used another (a Vegetronix). Mine is exactly a SDI - 12 USB converter, but I don't know how it does, USB works as a virtual COM port.

The problem I have is to use Hyperterminal, the communication works perfectely (I opened the virtual COM5 port, I write the SDI-12 commands and responses of sensor); However, if I try to use MAX or the SDI-12 LabVIEW API or even a manager of LabVIEW RS-232 (I mean a VI which includes RS-232 VISAs), I have does not work. It's as if my PC sends orders but nobody reads.

Do you know what is happening?

Thank you!!

Hello Martijn,

Thank you very much for your answern. The problem is solved apart, and it has involved two errors:

On the one hand, it is necessary read and write the synchronously.

On the other hand, I did mistake silly spruce I: a terminal character I write \n\r and it was only necessary \r!

In the example that I used and which is developed for the COM port is used \r\n as the hyperterminal just have to press Enter, so you don't know what the machine is actually written at the end!

Thank you very much

1000A

Tags: NI Hardware

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