Escape Codes and Sequences
Since the delimiters <$ and $> have special meanings when they appear in field codes, you cannot include them “as is” in a standard response. If you want to write a standard response that includes either or both of these field code delimiters, you must insert a space between the two symbols that make up each delimiter. For example, here is a valid standard response:
These field codes are great! You begin them with < $ and end them with $ >.