LI-COR LI-7500, Инструкция по эксплуатации

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Section 6
6-2 Troubleshooting
This can be due to a blown fuse, or inadequate power supply, or faulty wiring (make sure the
black wire on the power cable goes to ground, and the red wire to power).
PC Connection Problems
When the Connect button in the LI7500 Windows program is pressed, the program sets a
break condition on the communication line, signaling the LI-7500 to change to 9600 baud and
send its current configuration. The PC then sends the desired configuration (update rate, baud
rate, etc.) back to the LI-7500. Both units then change to the desired baud rate, and operations
begin. When the Disconnect button is pressed, the PC signals to LI-7500 to change its RS-
232 configuration back to what it was originally (or to that set up in the RS-232 panel).
"Port in use or does not exist" when connecting
This message indicates that the COM port setting on the Connect page is either incorrect, or
else that COM port is already in use by some other program running on the PC. If you are sure
that the COM port is correct, and there is nothing else running, try rebooting.
"Not able to connect to the LI-7500 successfully" when connecting
Press Connect again. Sometimes it takes a couple of attempts. If repeated attempts fail, then
make sure the COM port is in fact the one into which you are connected. Review Figure 3-3,
and make sure you are connected according to one of the methods indicated there. Make sure
the LI-7500 is in fact powered and running (press the Reset button (Fig. 5-2) and see if the
LED lights for about 5 seconds).