LabVIEW Driver for Additel ADT761 Automated Pressure Calibrator, having problems with serial communications

[Anthony_Steiner]

Does anyone have a LabVIEW driver for a Additel ADT761 Automated Pressure Calibrator?

I have been trying to build one but I am having issues trying to communicate over the serial port with it. I can use Additel's app called "Additel/Land" and that talks to it fine. I can also communicate with it using a terminal app called "iCommTool" which Additel suggested. This proves that my USB to RS232 converter is working correctly. I do not have a null modem in the communication line and I assume this is correct as the "Additel/Land" and "iCommTool" apps are working. But I cannot communicate with it using LabVIEW, or an app called "RealTerm" or the "PuTTY" app. One thing that I have noticed is that when I am using "Additel/Land" or "iCommTool" both the "RST" and the "DTR" on my DB9 Pocket Tester remain red while using the other programs (LabVIEW and PuTTY) they turn green as soon as I connect to the serial port. I don't think this means much as the communication to the ADT761 only uses GND (pin 5), TXD (pin 3), and RXD (pin 2) wires.

Any suggestions?

[pj001]

Hi Anthony, did you get a solution to this? Or have you been able to get your Additel ADT791 to communicate with LabVIEW? Please share how.

I have a similar problem. I got the Additel 681A pressure gauge and I need to view and log the data with LabVIEW but can't find the driver anywhere. 

Can you suggest any solutions?

Thanks in advance.

PJ

[rolfk]

If you have trouble communicating with serial port devices from LabVIEW, the first thing to do is to watch this presentation: https://labviewwiki.org/wiki/VIWeek_2020/Proper_way_to_communicate_over_serial

Tim knows a lot and explains most of the typical gotchas very well. It’s not that difficult once you know the details and realize that RS-232 is only a very loose standard with umpteen possibilities to do things just that tiny little bit different than anyone else is not doing it either.

A common joke in the past was that RS-232 really stands for “resolder pin 2 to 3 and 3 to 2’ and has little to do with a standard as its name would make you want to believe. The resolder joke is loosing its punch nowadays with virtual COM ports but it still inherits most of the “recommended standard” troubles.