Published: June 24, 2014
Error (-434) when trying to read controller's message queue
Versions affected: PAC Control R9.3c and earlier
PAC Project 9.4003
While using the PAC Control debugger, if you try to read the controller's message queue you may get error -434, which says the following:
The control engine is in use by another process on this
computer, or may be unreachable.
Close PAC Control (or at least get out of Debug mode). Open PAC Terminal and inspect the controller's message queue. The key is to make sure that PAC Control (on that computer) is not communicating with the controller and that no other instances of PAC Terminal are communicating with the controller (on that computer). If there is only one instance of PAC Terminal open on that computer, it should be able to read the controller's message queue.
Opto 22 has resolved this issue.
Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
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