ASCII Decode V2

Parse ASCII character vector into Simulink values

  • Library:
  • Simulink Real-Time / RS232


The ASCII Decode block parses an input vector produced by one of the following:

  • Serial port Receive block

  • Serial port FIFO Read block

  • ASCII Encode block

It makes the converted values available to a real-time application. It assumes that the input vector was prepared using an output format specifier similar to printf and uses an input format specifier similar to scanf.

This block generates inline code for the target computer. You cannot use it for Simulink® simulation.



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The input vector can be either 8-bit or 16-bit and signed or unsigned. If the data format is 16-bit, the block ignores the upper 8 bits of each entry.

Data Types: int8 | uint8 | int16 | uint16


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cnt receives the number of format specifiers satisfied by the input character vector.

Output ports corresponding to items in Format.

This block generates inline code for the target computer. You cannot use it for Simulink simulation.

Data Types: single | double | int8 | uint8 | uint16 | int16 | int32 | uint32


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Enter a scanf like format string. Each format specifier such as %d must match a corresponding part of the input vector. Literal strings in the format must match the characters in the input vector. The format specifiers follow the normal description for scanf. They must be enclosed in single quotes. Failure to include these quotes causes simulation failures.

An example format string is:

'alpha %d bravo %f\n'

In this example, assume that the data from the FIFO read is 'alpha 5'. In this case, cnt is 1 and the second output is unchanged from the last time both were found in a character vector. If the model expects 2 values, and cnt is less than 2, the model detects an error in the data.

Programmatic Use

Block Parameter: format

Introduced in R2008a