APPENDIX A: APPLICATION NOTES INTERFACING USING HYPERTERMINAL
PQM POWER QUALITY METER – INSTRUCTION MANUAL A–7
A.2 Interfacing Using Hyperterminal
When upgrading firmware, the PQM may appear to lockup if there is an interruption on the
communication port during the upload process. If the PQM does not receive the necessary
control signals for configuration during firmware upload, it could remain in a halted
situation until reinitialized. The steps used by EnerVista PQM Setup to upload firmware to
the PQM are as follows:
1. Prepare the PQM for firmware upgrade by saving setpoints to a file.
2. Erase the flash memory and verify it to be blank.
3. Upload the new firmware.
4. Verify the CRC when upload is complete.
5. Run the new code.
If the PQM is interrupted prior to erasing the flash memory, it could be halted in a mode
where the display will read:
If the computer being used to upload firmware has a screen saver enabled, and the screen
saver operates during the upload process, the communication port will be interrupted
during the launch of the screen saver. It is recommended to disable any screen saver prior
to firmware upload.
There are two ways to alleviate this condition: one is to cycle power to the PQM; the second
is to interface with the PQM using a terminal program, such as Hyperterminal, and perform
the upload process manually.
Cycling Power
Remove and then re-apply control power to the PQM. The PQM should then run the existing
firmware in its flash memory. If the PQM does not run the firmware in flash memory,
attempt the second method using Hyperterminal.
Hyperterminal
1. Hyperterminal is a terminal interface program supplied with Microsoft Windows. Run
the program “hypertrm.exe” which is usually located in the Accessories folder of your
PC.
2. A Connection Description window will appear asking for a name, use a name such as
PQM for the connection and click on OK.
PQM FLASH LOADER
ENTER TEXT “LOAD”
Courtesy of NationalSwitchgear.com
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