Read data of sartorius scales with RS232 interface

Dear users,
I have to use a Sartorius scales with a RS232 interface.
In the attachment you see the program with which I try to read the data of this device – so far not successfully.
Therefore I have several questions:
Could somebody tell me if the structure of my program is correct? I think so, because I saw that other people created similar code. But I am not totally sure about this.
To read data of the scales, I have to send a print control to the device. In the manual of the device is written that the print command is as in the attached picture. They mention that ESC = Escape, CR = Carriage return, LF = Line feed.
So, how do I write this command correctly? Do I have to write in a string ESCPCRLF, or ESC P CR LR or ESC,P,CR,LF, or…? I am really totally lost here because I have never worked with such an interface so far.
I do not have a RS232 interface on my computer, so I use an USB to serial adapter. Do I have to adapt the baud rate etc. of my adapter in the windows device manager to the values of my scales?
When I run my program, the number of bytes at serial port is always 0. Could this be that I use next to my USB to serial adapter another adaptor to connect the 9-pin USB connector to the 25-pin connection of my scales - perhaps a connection is wrong?
I really would appreciate your help much!!
Attachments:
ScalesLV2010.vi ‏18 KB
ScalesLV2013.vi ‏21 KB
PrintCommand.png ‏5 KB

partial wrote:
Thank you for your reply.
Searching for drivers was one of the first steps I did. But unfortunately my device is so old (about 25 years) that there is no driver. I also tried to work with the programs of the LabVIEW LLB which are available from your link, but there I also get the 1073807339 error code.
Checking the cabling is for sure a good idea. So far it seems to be fine.
Thank you for your hint that the use of delays and the Bytes at Serial Port is incorrect.
But why is Bytes at Port then mentioned in this NI-document:
http://digital.ni.com/public.nsf/allkb/874B379E24C0A0D686256FCF007A6EA0
There they also mention the delay which should be used for older instruments. Since my device is about 25 years old, I thought that the use of wait is a good idea.
But perhaps you are right. So, could you please correct my program then? As I mentioned, I have never worked so far with the RS232 interface, so I really would be glad if somebody corrects my code.
Unfortunately, what NI doesn't tell you is that "Bytes at Serial Port" is a last resort, to be used only if you have no other way to figure out if a device has completed sending data. Since you have a marker - the line feed termination character - I would configure the VISA serial port to use it, and then discard the white space (the CR) at the end. That way you read exactly the data and don't have to insert a wait to make sure everything was read.
IMHO - If you have to insert a "wait" in between commands, you probably don't fully understand how to communicate with the equipment. Of course, I have worked with power supplies that are so "dumb" that the programming guide says that you have to wait x milliseconds for a command to process!
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

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