| ??? 04/25/05 16:40 Read: times |
#92311 - Virtual Serial Responding to: ???'s previous message |
Neil Kurzman said:
Also note that diffent USB ports on the same computer get different numbers. Andy Neil replied: This depends on the drivers and/or the adaptors. What I have seen is that this is OS dependent (and I'm sure it depends on the USB device class as well). On 98/ME the OS assigns the COM port according to the order of enumeration (when the device is activated) and on 2000/XP the COM port is assigned according to the physical port. So we have seen devices on 98/ME that keep the same COM port number when moved to different ports (same number of devices attached) but on XP doing this changes the port number. I have witnessed this with two different classes of devices, but cannot guarantee that all devices behave that way. The nice thing about XP is that the COM port will be the same no matter what else is plugged into the system. On 98 the COM port might move if the system is booted with one device added or removed. I suspect this was done intentionally by Microsoft. GB |
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