Upgrade Rom_Viva File To The Module (0X03); Command Summary - SimTech SimCom SIM800 Series Application Note

1.4 Upgrade ROM_VIVA File to the Module (0x03)

To upgrade ROM_VIVA file to the module, the frame should include four parts: the frame head
(0x03), 4-bytes data frame length (maximum length is no more than 512 bytes), data fields and
4-bytes data checksum. Checksum calculation method is as following: add all data bytes of the
number, the value of last 4 bytes of the number is the checksum.
The frame format is as follows:
CMD Frame Length
0x03 4bytes， Low byte in the front data frame

1.5 Command Summary

CMD Description
0xB5 Sync byte
SIM800 Series_Software Upgrade_Application Note_V1.02
Figure 4：Send head information
Data Field
Figure 5：Upgrade ROM_VIVA file
Smart Machine Smart Decision
Checksum
4bytes，Low byte in the front
Direction
PC->MODULE
8
2014-06-30