RS232 received does not not for 67 bytes?

I built a simple send and Recieve VI that implements RS232.  I have a problem when I send an order to wait 2.5 seconds (I tried several different waiting times, don't know if that is important here, I like it just here for my peace of mind), I have a property node after the waiting that is tell me the number of bytes in the port, then I read the buffer.

What happens is that I get nothing except a carriage return in my outs read buffer.  My property node tells me that I have 67 bytes in the buffer, but it does not display the 67 bytes in the display of the read buffer.

I'll try and step by step my code here, because I know not too how to post a Video on these forums.

1.), I have set up my com port, 9600 baud, 8 bits, 1 stop bit, no parity bit, no flow control.

2.) rinse the i/o buffer, mask 16

3.) write my order

4.) write a return transport

5.) 2.5 seconds

Property node 6.), series settings: number of bytes to the Serial Port

7 read buffer.)

8.) close

Real simple and works on other commands, other commands do not reach the size of 67 good bytes and the highest, I've seen this work with is 24 bytes.

I just found this curious that it tells me the number of bytes in the port yet all my readings of VI is the return shipping.

All ideas

Thank you

Bill

Administrators: I apologize if I am in the wrong forum, feel free to go if I am.

One thing that you should be aware, this is the default behavior of reading VISA is that it will end is read as a LF (0xA) is detected. This is the entrance to "Allow a termination character" of VISA service set up a Serial Port. By activating this option, it does not matter ask you how many bytes. If there is a LF in the data, you must set the option 'Enable' false.

Tags: NI Software

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