SATEC RDM172 Manual - Manual (Page 104)

Chapter 4 PAS Application Software Upgrading Device Firmware
104 Series PM172 Powermeters
6. Wait until PAS completes upgrading your device. It takes
about 3-4 minutes at 115,200 bps to download the file to
the meter.
7. After upgrading firmware is completed, the meter restarts,
so if it is connected through the modem to your PC,
communications can be temporarily lost. You may need to
a short duration until PAS restores a connection with your
device.
8. You possibly need to restore the previous port settings in
your meter if you changed them.