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Parity settings on module

Data formats supported by Digi radio modems are as follows:

By data format we are referring to the number of data bits(B), type of parity(P): Even, Odd, Mark, Space or None (E, O, M, S or N) and number of stop bits(S). This is often represented in using the short hand style D-P-S (Data bits-Parity-Stop bits). E.g. 8-N-1 means 8 data bits, None parity and 1 stop bit.

All Digi radio modems transfer 8 bits over the air by default. This operating mode supports a number of data formats that require a total of 8 bits, such as 7 data bits, Even parity & 1 stop bit (7-E-1), or 7-O-1, 7-M-1, 7-S-1 and 8-N-1.

Also, all Digi radio modems can generate parity bits on the receiver as they shift the data out of the UART (serial port). This allows support for additional formats 8-E-1, 8-O-1, 8-M-1 and 8-S-1. The setting of 8-M-1 is equivalent to a setting of 8-N-2 if two stop bits are required.

Additionally, the XStream radio modems have the ability to actually transfer 9 bits over the air which is required for some multi-drop systems that use the parity bits to differentiate between address and data bytes.

Use the NB parameter to configure the parity and nine-bit settings of the XStream modems. Visit Parity and 9-bit options on XStream for more information on setting the NB parameter.

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