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PXS8 SMS PDU 7-bit and 8-bit ASCII | Thales IoT Developer Community

July 29, 2019 - 8:38pm, 797 views

I am using the PXS8 on a CDMA network. The module is configured for PDU mode. The *** character set is being used. 

After an SMS message is sent to the PXS8, I am using the AT+CMGL command to display the PDU.

For MMS messages, each ASCII character is represented by eight bits. (For example, the character 'H' is represented as 01101000 in the PDU.) 

However, when a regular SMS is sent, the PXS8 represents each ASCII character with seven bits. (So 'H' is 1101000.)

Is there any documentation available that explains why the PXS8 sometimes uses 7-bit formatting when displaying SMS PDUs?