Is this "OK"? Lots of Serial Write.vi's !

Hello all. I had a recent post and two excellent responses about how to get a constant FALSE condition to send a command ONCE, and a constant TRUE condition to send a command ONCE. In other words, while the buttons are "idle", nothing is being sent. The attached VI works great, but look at all the Serial Write.vi's! It doesn't really bother me, but is it just seems wrong. Are all those vi's "doing something" while they sit there in the case structure? Is there a way to get ONE Serial Write vi outside of the cases? Or should I care?
background: In my other applications, the hardware has a FIFO and memory and I can concatenate lots of strings and send them to ONE Serial Write vi. In my new application, it's paramo
unt to send ONE command and stop, hence the imbedded case structure and shift register to tell that a key has been pressed. The other attached vi is an example of what works on my old hardware but not the new stuff, so you can get an idea of why the new program seems so fat.
Richard
Attachments:
WriteOnce.vi ‏58 KB
ABSsub_VL&P.vi ‏91 KB

If you want to use a single serial write, you can programmatically build your device dependent data string. See attached.
P.S. What a great user profile name. Wish I had thought of it.
Attachments:
build_ser_string_programmatically.vi ‏37 KB

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How does VISA serial write work?

I am using LabView 6.0 and the VISA functions to run a distributed sensor network using RS-485 from a NT 4.0 machine.
In order to work properly I have to manually control the RTS line which isn't a problem using the property node.
Here's what I want to know.
I'm using a sequence structure:
I'm writing a command using VISA serial write
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Now in this setup does Labview pass the command to the serial port and then jump to the next frame in the sequence, or is there some kind of acknowledgment from the serial port that its done so the Write vi knows to finish, or am I running a the risk of cutting off my communication before I've finished or should I put in a short wait after the write to port
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Robert:
With the default settings, VISA Write will not return until the data has been at least posted into the hardware FIFO. To be 100% sure that the data has been transmitted over the wire, you should do these 2 things:
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Hello List,
I am developing serial routines to communicate with external hardware. In many cases, XON/XOFF flow control is used.
I have configured my PDA device to write out a large file. During the transmission, I use my development computer to monitor the transmission. During the transmission, I can send XON/XOFF characters to the PDA. If I send an XOFF, it will "pause" until I send an XON character. It works great unless I wait for more than about 3 seconds. If the PDA is forced to wait for more than 3 seconds, the transmission is terminated with an error. However, if I send an XON character, before the 3 seconds delay, it continues the transmission and no error occurs.
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Hello,
I apologize for the delay in responding to your post. You are having a timeout issue when using software flow control (XON/XOFF) to transfer data between a PDA and a host computer, right? Are you getting error code 7 when the PDA times out? I was able to duplicate this issue here. This error code is a timeout error and it means that not all bytes have been sent. I spoke with members of the R&D team and they know about the problem. While they were unable to offer a formal solution at this time, they did provide a workaround which I hope works for you.
Put a while loop around the serial write VI on the PDA.
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I have attached a couple of VIs that implement serial communication using XON/XOFF flow control and that use the above workaround. Please let me know if this solution works for you. If not, can you provide some additional details such as the error code and if the timeout is happening on the PC side or the PDA.
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Attachments:
Serial_XonXoff_(Host).vi ‏55 KB
Serial_XonXoff_(PDA).vi ‏68 KB

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I have a rs232c stepper motor controller connected to a PC running
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> Hope this helps

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Hey.
I am doing my bachelor in Labview, and are using a arduino 2560 as a microcontroller for a thermal sensor.
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Attachments:
bachelor_2013.vi ‏259 KB
Modded Advanced Serial Write and Read_test.vi ‏40 KB

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<Edited by Host>

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Is this "OK"? Lots of Serial Write.vi's !

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