I'm having an issue with getting a full waveform out of a Tek TDS 3054.  Initially, it seemed to be related to reading binary files from the scope. Now the problem seems to be more basic: writing commands to the scope with the VISA Write VI through the controller.<br>
<br>
Setup details:<br>
Scope FW version: 3.15<br>
Scope comm module: RSA3GV GPIB/RS-232/VGA<br>
Laptop OS: Windows 10<br>
LabView 2019<br>
Prologix USB-GPIB Controller Version 6.107 (laptop USB to GPIB on equipment)<br>
<br>
I created the Set GPIB address VI (attached) to be able to assign GPIB addresses to each device (per the controller documentation).<br>
<br>
There are three devices on the GPIB bus: a Fluke DMM (GPIB 3), the 3054 (GPIB 5), and a Tek TDS 744A scope (GPIB 7).  All three are powered.  No problems controlling and reading measurements from the DMM.  I haven't tackled the 744 yet.<br>
<br>
The example from NI/LabView (Tektronix TDS 3000 Series Transfer Current Waveform Example.vi) doesn't work as is, I believe due to the controller requiring a terminator at the end of all/some (?) VISA Writes.  <br>
<br>
The Tek TDS 3054 Oscope Transfer Current Waveform Rev-.vi (attached) is the NI example VI, but with the Set GPIB address VI inserted at the beginning and a CR concatenated to each string feeding a VISA Write.<br>
<br>
The ID query (*IDN?) returns the correct information without generating an error.  However, it appears that Writes that are not queries generate Error 420 (Query UNTERMINATED).  <br>
<br>
When sending a reset (*RST;) the scope does reset, but I get an Error 420.  This happens whether or not CR is added to the end of the reset command.<br>
<br>
The same goes for recalling a User Setup (*RCL 1); the scope recalls the stored setup correctly but I get an Error 420.<br>
<br>
What am I missing?<br>
 
