PCI-GPIB and controller movement legacy Newport Orion-CM - timeout in MAX but not MATLAB

I kinda a weird GPIB problem which seems to be related to the legacy quirks of implementation of GPIB.  The system I use is an Orion of Newport-CM, which has a controller of electrostrictifs actuator in him as a monitor of power on separate GPIB addresses, but a physical port.  I have it connected via a<= 2m="" cable="" to="" an="" ni="" pci-gpib="" board. ="" i've="" tried="" both="" the="" 2.6="" and="" 2.2="" ni-488.2="" drivers="" and="" both="" act="" the="">

I found that when I try to query the device through MAX, I can see a SPY OR that the first FindLstn mark 2 units, but expires (probably to try a * IDN? command, because it signals no response).  After that, if I try other commands via MAX or MATLAB, all the GPIB commands time out, so I have to power cycle the Newport before being receptive again.  I tried every permutation of the GPIB driver located in MAX without result - always the same behavior settings.

Curiously, however, when I use the device only in MATLAB (with the instrument control toolbox), I can have some success, but with delays every now and then are not paralyze the MAX in the same way, it was.  I am able to open the device with:

mcobj = gpib ('nor', 0, 1);

fopen (mcobj);

and query with:

fprintf(mcobj,'*IDN?');

data = fscanf (mcobj);

and get the good * IDN? response.

In addition, I can do writing and reads the device (with intermittent downtime... I found I need to leave at least 0.3 seconds between commands, which leads to a slow operation).

It left me speechless.  Of course, it appears the interface GPIB works, maybe slowly, but if I'm not mistaken, the same driver should be usage of communication for MAX and MATLAB, why so MAX time so that I am able to have the operation in MATLAB?  Are there some low level which may be different that I cannot change in MAX or GPIB configuration, but is defined by MATLAB?

Any thoughts appreciated.  Newport is as usual MOM on obsolete parts, and their job is not much help outside retailer orders GPIB (Nothing on the specifications of the bus).

Thank you

Scott

Thanks for the tips.  It seems that the old Newport is just really, really slow (must be material and mid-1990 s), so he needs a good break between her send GPIB commands.  I installed the 1.7 legacy drivers, and those at least have correctly the * IDN? the device response.  Gpib MATLAB interface is quite simple you can give sufficient breaks between commands to send to the Newport, so in it, I am able to control the time between orders.

It seems that it is just a matter of a slow device.  I know not what look like the internal FindLstn characteristics and, therefore, why the new version of MAX expires while the old ones do not, but for really old hardware that there could be GPIB read/write in the new pilot who are too fast to actually really old equipment sufficient time to respond.  Thanks again for the input.

Tags: NI Hardware

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