QuestSuite™: How do I know which serial communication port to use?
USUALLY people use com port #1. This is the best first try. If after setting up the port you get an error message, try com port #2. If your system has a com port #3 or #4, these should only be used as a last resort. The reason for this is somewhat technical, but for those interested here it is: Com port #1 and com port #3 share something called an interrupt. When data comes into the PC on a serial port, this interrupt is activated. It tells the computer to interrupt what it’s doing and go and get the data located at either com port 1 or com port 3. So if you are already using com port 1 for a device other than QuestSuite, it may be occupying or conflicting with sharing the interrupt. Then when your instrument needs to use this interrupt to tell the computer that it has data to send, the interrupt service routine that gets data is busy with com port 1 and consequently misses the data coming in on com port 3. This same phenomenon occurs on com ports 2 and 4.
Related Questions
- Is the function access to the system also possible trough e.g. a serial communication port or paralel I/O control instead of manual selection through the front panel selector-switch?
- The Personal Computer used for communication with Yaskawa Products does not have a serial port. How can communication be established?
- Is the serial communication port Full or Half-Duplex?
