Hello !
I'm trying to control an Ez Zone Watlow temperature controller through modbus via Labview. I've downloaded the basic VIs provided by Watlow to do this, and had them converted from v 8.6 to 8.0 (I'm running on Labview 8.2). The Ez Zone is connected to the computer (Win XP SP3) with a serial RS485 crossed cable on the PC's serial port COM1.
When I run read.vi (attached below) in Labview, and try to read a random parameter, it returns a empty string and this error :
Error 1 occurred at an unidentified location
Possible reason(s):
LabVIEW: An input parameter is invalid. For example if the input is a path, the path might contain a character not allowed by the OS such as ? or @.
=========================
NI-488: Command requires GPIB Controller to be Controller-In-Charge.
I don't really understand how this VI works, because althought it calls a .dll file, I don't see how the connection to the instrument is made.
The serial port is configured as follows :
Bits/s : 9600
Data = 8 bits
Parity : none
Stop : 1
Flow control : none
... which is the default communication configuration on the instrument.
Thanks for your help,
Paul