PUS Command Postprocessor¶

A postprocessor for handling ECSS PUS commands, according to ECSS-E-ST-70-41C.

This postprocessor will set the length and sequence count in the CCSDS primary header. If configured, it can also calculate a checksum.

Class Name¶

errorDetection (map): If specified, a checksum is appended at the end of each command. Detailed below.

type (string)

Required. Can take one of the values:

16-SUM: calculates a 16 bits checksum over the entire packet which has to contain an even number of bytes. This checksum is used in Columbus/ISS data.
CRC-16-CCIIT: standard CRC algorithm used in PUS and also in CCSDS standards for frame encoding.
ISO-16: specified in PUS as alternative to CRC-16-CCIIT.
NONE: no error detection will be used, this is the default if the errorDetection map is not present.

initialValue (integer)

Used when the type is CRC-16-CCIIT to specify the initial value used for the algorithm. Default: 0xFFFF.