The short question: Only the COM port (regardless of which one) assigned to ASRL1::INSTR (but not ASRL2 or any other number) will successfully verify settings and allow communication between the attached device and MAX or LabVIEW. Are there any ideas on what's wrong, what to check, and how we can fix it :)? Thanks in advance.
Our setup:
Two devices - a Keithley 2000 Multimeter and an HP 34970A Mux can be connected to a computer (Windows XP 32-bit) with one on-board RS-232 (COM1), and one USB->RS-232 (COM3). Both devices on both ports are visible and accessible using hyperterminal regardless of which devices is connected to a particular port. There are no errors in the Windows Device Manager.
MAX doesn't detect either port automatically so they are both manually added. MAX and VISAIC both will only see the device connected to the COM port that we manually assigned as ASRL1::INSTR in MAX and LabVIEW will not add any other ASRL entries to the VISA dropdown. The error code given when we try to detect any port assigned to ASRL2 or any other number is 0xBFFF0011. After searching it took me to this thread and others similar to it which did not have solutions that worked. All drivers and software have also been updated to their latest versions, all cables are verified as working, and as mentioned hyperterminal is able to see both devices at the same time regardless of what order or connector is used.
Thanks in advance,
-PAK
