Hardware handshaking, originally a serial comm problem?
Hello... I posted a little different but related question a few days ago, when I had no success at all communicates with a vapor deposition rate controller Cygnus of Inficon. What I discovered, was that I couldn't communicate at all at 19 200 same baud if that was shown in the manual Cygnus as an acceptable rate. I got sporadic readings at 9600 baud, and found that I had to go all the way up to 2400 baud to get a READING/WRITING/waiting Seraglio whenever I asked a (once every 10 seconds)... I also found that I had to increase the time between WRITING and READING of an original of 100 msec to 500 msec to be able to capture the entire message (rather than just a part of it) every time that... So now we run labview code that captures the data of this instrument once every 10 seconds for hours and hours... And the news is not yet as good as I had hoped... What I see now, is, perhaps, one in every 20 readings is completely wrong... The message that I will be back to the serial port is a long string of digits HEX that I then analyze in a way known to extract four relevant parts of digital data... I have then that plot the data and send it also to an Excel spreadsheet... The numbers that all directions until one of these erroneous readings happen to be a number which is always between-100 and + 100, it will be rather something like 5.7E + 38... And when one of the four readings is bad, they are ALL wrong, which means that the reading series (or perhaps writing series?) was corrupt...
I used a very similar code to extract information very similar to an another Inficon Vapor Deposition rate controller (model SQC310) running at 19 200 baud and had zero problems... I contacted Inficon yesterday and all that they have said so far is that the "the 310 does not use handshaking HW for communication" (the implication being that the Cygnus should use those handshakes) and he went on to say that...
"It is possible that his LabView application cannot be configured to use HW handshaking. Have him check his application for the HW handshake settings. It can cause the Cygnus to become confused if it is not activated or properly initialized. He may also want to try the simplified 2, 3 and 7 (possibly to pin 1) cable for the Cygnus. It would eliminate his lines of communication of handshaking HW and solve its problem of communication. »
Of course, I am not knowledgeable on how to correctly configure this handshake... I have communicated with several instruments using VISA series WRITING and READING the thread of years and for the most part, you set baud rate, number of bits of data, stop bits, what kind of parity and control flow, if any and GO... It's just worked... It's my first experience with an instrument that will not work with the LabVIEW code...
First of all, I guess I have set up or at least would check handshaking through a property node (yes/no?)... Anyone can present my views on how I could verify this? Second, observations on their tips above I am building a cable series that just TX, RX son and mass to ensure that the hardware handshake lines are not yet hooked?
INFICON told me they use some executable owner in the House to talk with the instrument of Cygnus series and they are not well informed and are suspicious therefor, LabVIEW is causing communication problems I saw of my... I, however, worry that instrument, although currently made and rather expensive (4 times the cost of a SQC310) is based on ancient technology (he has a floppy drive on the front and "monitor" is a screen of CRT type that takes a number of seconds to 'warm up' and 'activate' when you turn on the unit first...
Any ideas or advice on material transfer protocol or if you think that it would be a reasonable step to "cut the wires of the handshake" on a special serial cable would be very appreciated...
The unit of Cygnus is available on the link below (you can also download its manual on this page)
http://www.inficonthinfilmdeposition.com/en/cygnusthinfilm.html
Thank you very much... bob...
Some USB-adapters series do funny things with the handshake lines. I had one several years ago which said only the lines of the handshake then that he was transmitting a character and released between the characters. The device with which I tried to communicate has got very confused because it expected of these lines be invoked unless an interruption of transmission was actually necessary. This behavior was not documented in the manual or on the website of the manufacturer of the adapter. So, if you decide to try to use the handshake, check what actually makes your card.
Lynn
Tags: NI Software
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