You can secure the Programming port by the security setup webpages of the master (see attached screenshot). With this setting, only RS232 Terminal is blocked.
The RS232 terminal contains a secusity setup menu, from which you can turn off and modify the security settings. So personally I would let open the Programming port, because it is the last chance to reset the security settings if you lost your admin account data.
Speaking from experience, BE VERY CAREFUL locking out this port. If you have any problems here, you will have to send the unit in to be wiped clean before you can access it again. If you are looking at this from a security stand point, you could simply not upload the source files which would prevent someone from extracting your code. If, on the other hand, you are worried about someone monitoring communications, I would say you have bigger security problems if they can get access to the programming port.
Comments
Full details are in the Netlinx NIxxxx Manual under security, be very careful though!!!
The RS232 terminal contains a secusity setup menu, from which you can turn off and modify the security settings. So personally I would let open the Programming port, because it is the last chance to reset the security settings if you lost your admin account data.
Jeff
Thanks all for your replies... its oviously possible... but!
which leads to the next question....
Is it possible via code?