Yes, I tried but using cutecom for the linux which did not work as I expected b/c according to the NI Serial Device Server User Manual (Appendix F: VISA and Serial APIs on UNIX): "To access the erial pors on an ENET-Serial box under a Unix architecture sucha s Solaris or Linux, you must use the NI-VISA driver. You can use the device I/O API on these platforms to acccess local serial ports(open, write, etc.); however, you cannot use it to access the ports on the ENET-Serial box. The API on Solaris and Linux was not designed to access remote serial ports and thus cannot support this functionality.
Assuming that the VISA drivers have loaded successfully since visaconf shows the following Serial ports:
So, I tried the vxipnp/linux/NIvisa/Examples/C/Serial/RdWrtSrl as root user since the permissions on these are limited and I get the following response:
Cannot open a session to the device. Hit enter to continue.
And btw, I have a DB-9 female converter plugged into the back of serial port 1 (ASRL1) with paperclips plugged in for RS-485 loopback. But the VISA resource manager cannot even open a session to the device??? At this point I'm thinking about upgrading the firmware, what do you think?
Good news! I am able to configure the serial server using a WindowsXP laptop... finally some success. I installed the niser320.exe also known as NI-Serial drivers. I had mistakenly installed the wrong software on Windows previously (NI-VISA is not the one to install for Windows).
In response to your suggestion of testing the other ports on the Linux box, I don't happen to have any traditional com ports DB-9, just USB. I'm using RedHat 4 and installing the NI-VISA API only, so I'm going to give it a shot installing the following NI Serial Device Server for linux http://ftp.ni.com/support/softlib/serial/Linux/nisds_linux10.tar Hopefully, this works! Thanks for your help!