hi,
find attached a file "vt4004 write.vi" (LabVIEW 6.1). This file I use for serial write to HERAEUS VT4004 oven (9600 baud). If it useful for you and you need to read back the temperature - please write to:
werner.hasche@web.de . You can have in addition a complete temperature-sweep-program for this oven. I do not use VISA - but I don`t see a problem to adapt it.
Regards
wha