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Hello Ton, I received a reply from Julabo this morning with a sample vi. It turns out that they use 7 data bits, not 8. I checked my hyperterminal program and it was set to 7, I have no idea how or why it was set at 7. I thought I set it at 8. I do like the idea of checking the bytes at port for use with reading. Currently the vi was set at 10 for bytes to read, but I am all for having the program able to figure it out for itself. Thanks Bryan Edit: I added the bytes at port (option 1), I noticed that I needed to insert a 250ms wait after the data was sent for it to work properly. Is this normal? I imagine that is just the time it takes for the unit to respond....

QUOTE(tcplomp @ Aug 9 2007, 10:42 PM) The code is an EXE, so I am not able to see anything. If I do not get results from the US Julabo I will contact Germany myself. I am adding 2 screen shots of my sniffer. _out.jpg = I used HyperTerminal to set the control to 16, next I sent a 15 command in LabVIEW (which did not work), so I sent it in HyperTerminal and it worked fine. _in_mode.jpg = I sent the command in HT and received a response, but no response with LabVIEW. I have tried both DTR/DSR and RTS/CTS and no luck with either.

Hello, I have a Julabo circulator that I am trying to communicate with using RS232. The problem seems to be the hardware (flow control) handshake that is required. If I use HyperTerminal in windows and choose 4800, even, and hardware flow control everything works fine. But with LabView the options for hardware are RTS/CTS and DTR/DSR, I have tried each and neither work. I know LabView can do it because Julabo’s free utility was written in Labview. But everyone I have talked to in the US says that Germany wrote the code and the do not know how the RS232 communications work. So I am waiting for a response. In the mean time I have been using a port sniffer to double check what I am sending in LabView against what I am sending in HyperTerminal. The commands look identicle, so I am suspecting that I do not have the hardware handshake working correctly. What is the secret to get the hardware handshake to work? It is a combination of RTS/CTS and DTR/DSR or is it just one or the other? I have been searching the net, NI and here and I cannot find any topics talking about hardware handshaking. Bryan