There might be additional useful information in the first couple of paras of the original (Japanese) article that Google Translate can't make sense of.
I've got various references to add to this, including http://bitsavers.informatik.uni-stuttgart.de/pdf/burroughs/terminal/1093788_TD_730_TD780_System_Reference_Manual_Nov79.pdf figure C-4 appendix C page 3 (document page C-3, PDF page 96), "C Programmers' Guide to Serial Communications" (Campbell, Sams) figure 1-7 page 16.
Possibly also a screenshot showing a protocol analyzer using these characters for a captured session.
Added references to similar standards in national standardisation organisations. Added reference to Japanese source page. Removed japaneze symbols from autotranslated page.Andrii Muliar (talk) 09:59, 19 September 2013 (UTC)