GOM-804 & GOM-805 Firmware Update Manual 
6 
Firmware Update 
Procedure 
Flashing the Master Microcontroller 
 
Before performing the firmware update, please ensure 
that the USB driver for the GOM-804/805 has already 
been installed. See the user manual for installation 
details. 
 
1.  To update the firmware, a Type A-B USB cable is 
required. 
2.  Ensure the power is off on the meter. 
3.  Insert the USB cable into the USB device port on 
the meter’s rear panel. 
 
REMOVE  INPUTS  BEFORE  OPENING.
TO AVOID SHOCK,
WARNING
RS232
SER.NO. LABEL
100     240V , 50    60Hz
25VA  MAX
AC
HANDLER  /  SCAN  /  EXT I/O
TC  SENSOR
GPIB
 
 
4.  Plug the other end of  the USB cable into the PC 
that will perform the update.