© Microhard Systems Inc. Confidential 108
Appendix D: AT Command Firmware Upgrade Procedure
To update the firmware on the Pico Series Radio, it is recommended to use the Microhard Utility called AT
Firmware Upgrade, discussed on the previous page. If it is not possible to use the utility, the following pro-
cedure can be used to load firmware using AT commands. The file type used for this procedure is not the
same as when using the utility. A file must be supplied by Microhard Systems with the .svg extension.
More detailed information can be obtained by contacting Microhard Systems. This procedure is recom-
mended for advanced users only.
AT Command Upgrade Procedure
1. Enter Command Mode.
2. Select the baud rate 115200 bps (ATS102=1) for the modem to minimize the firmware upgrade time.
Connect Microhard modem through a COM port as the setting with serial port terminal software:
Baud Rate: 115200
Parity bit: None
Data bits: 8
Stop bits: 1
Flow Control: None
3. Run Microhard AT commands to do the flash upgrade in the following sequence:
3.1 Run “at&u0<CR>” at command terminal
Initialize the modem into flash image upgrade mode
3.2 Run “at&u1<CR>” at command terminal
Load the flash image into the modem. After this command is entered, don’t do anything except
send the firmware file provided by Microhard (.svg). It sends an “ERROR” response if the file
was not received.
3.3 Run “at&u2<CR>” at command terminal
Pre-arm the image flashing. You have 20s to trigger the writing procedure of the firmware image
from RAM to Flash memory. If you missed that window of opportunity, you need to pre-arm the
modem again.
3.4 Run “at&u3<CR>” at command terminal
Flash the loaded image. After this command has been issued, any action and power changes
could damage the modem. Modem returns the “ERROR” response when the 20s time-out is ex-
pired. The approximate duration on this step is 30s.
After the flash upgrade finishes, the modem reboots and it is ready to work.
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