Hello, I am working to interface a Denver Instrument S-8001 and a Mettler Toledo PB5001 analytical balances into the same .vi. Using the VISA sub-vi I can get both balances to report their mass to the .vi, but only if I have them continuously send data (i.e., comm port and baud, etc. are configured correctly). My difficulty is that the continuous readings are both unecessary and are prone to error, and the .vi will oftern record only a portion (or a zero) at any given sampling event. I can further confirm that using hyperterminal the correct print command for the Denver Instrument balance is 'esc+P', and I think the Mettler command is some variation of 'SI'. However, entering either of these commands (and other variations) into the 'string to write' terminal of the VISA write .vi does not appear to send the required information to the balance for it to respond with the measurment. I have spoken with both Metter and DI tech support, and after spending some time with each of them they were unable to resolve the problem... but suggested that maybe the fine folks at NI might have an idea. Looking forward to your response. Thank you!

How are you sending the esc character? You can't just type esc. It's hex 1B so you could right click on the string control and select 'Hex Display'. There are other functions such a typecast and Byte Array to string that are helpful when doing non-ASCII.