Interfacing Using Hyperterminal - GE Power Quality Meter Series Instruction Manual

A.1 PQM APPLICATION NOTES
A
APPLICATION NOTE PQMAN02: INTERFACING WITH THE PQM 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 PQMPC 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:
PQM FLASH LOADER
ENTER TEXT "LOAD"
If the computer being used to upload firmware has a screen saver enabled, and the screen saver operates dur-
ing 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.
a) 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 Hyper-
terminal.
b) HYPERTERMINAL
1. Hyperterminal is a terminal interface program supplied with Microsoft Windows. Run the program "hyper-
trm.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 connec-
tion and click on OK.
A-4
A.1.2 INTERFACING USING HYPERTERMINAL
PQM Power Quality Meter
APPENDIX A
GE Power Management