Vaisala vLog 4.4 - Manual (Page 100)

Troubleshooting
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Serial Port Problems
If you are experiencing difficulties communicating with Veriteq data loggers,
here are some tips and things to try before calling Veriteq Instruments.
Software Error Messages you May Encounter…
Unable to allocate COM port because it is busy
This error message means that vLog was unable to allocate the COM port be-
cause it was already allocated by a different program. You may have to wait un-
til the COM port becomes available.
Unable to allocate COM port because it is unavailable
This error message means that vLog was unable to allocate the COM port be-
cause it did not exist in the operating system. Check your available COM ports.
Unable to receive sync byte from COM port
This error message means that vLog sent a request message to the data logger,
but did not receive any response from the data logger. This could mean the data
logger is unplugged or the cable is not connected properly.
Unable to receive all of the bytes from COM port
This error message means that vLog sent a request message to the data logger,
but received an incomplete response message from the data logger. This may
mean there is a problem with the COM port on this PC, a problem with the ca-
ble, or a problem with the logger itself. Check these possibilities.
Unable to communicate with logger on COM port
This error message covers miscellaneous error conditions, other than those list-
ed previously. This message could mean that there is a problem with the COM
port on this PC, a problem with the cable, or a problem with the logger.
Things to Try:
1. Does the logger and interface cable work on a different PC? If so, the prob-
lem likely resides in the serial port configurations on the PC.
2. Are there other devices (such as a mouse) that use the serial port in question
without problems? If so, that port is likely not the problem.
3. Can you transfer data using a different interface cable? If so, the cable may
be damaged.
4. Can you transfer data using a different logger (with the same interface ca-
ble)? If so, the data logger may be damaged.
Invalid hardware model
This error message means that vLog did not recognize the hardware model of
the data logger, and as a result, did not know how to interpret the information
stored in the data logger. Ensure you are using a data logger supported by vLog.