Hoefer DQ300 - Manual (Page 29)

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Troubleshooting
Difficulties can arise when parameters are set
incorrectly or cable connections are not secure.
Here are some common problems.
1. The box to the left of the COM port is red. This
means that the COM port is not available.
Causes:
a. Another instrument or program (such as palm pilot/
hot sync) could be occupying the port, making it
unavailable. Make sure to close all programs of this
type before downloading data.
b. The selected port is incorrect. Follow step 4
(Connecting) to choose another COM port.
2. All lights are green, but no data has been trans-
ferred, even though the instrument shows “All data
downloaded”.
a. The connection between the DQ300 and the
computer is bad. Check and tighten the cable
connections. Make sure both ends of the cable are
plugged in tightly.