5-Bit Telegraph Code for Type-55 Teletypewriter

Type-55 teletypewriter (supposedly) could uses ITA2 as well, but Mainland China switched the encodings of numbers (all numbers are encoded with 3 ones and 2 zeroes) to have some kind of error detection built-in. Each character was preceded by 20ms of 0 and 30ms of 1.

I	II	🞄	III	IV	V	Alphabet	Numbers & Symbols
●	●	🞄				A	-
		🞄		●	●	B	?
	●	🞄	●			C	:
●		🞄		●		D	"WHO ARE YOU?" ^[1]
●		🞄	●	●		E	3
●		🞄				F	%
●	●	🞄	●		●	G	Not Used
		🞄	●		●	H	"
	●	🞄	●	●		I	8
	●	🞄		●		J	Bell
●	●	🞄	●	●		K	(
	●	🞄			●	L	)
		🞄			●	M	.
		🞄	●	●		N	,
●		🞄		●	●	O	9
	●	🞄	●		●	P	0
	●	🞄		●	●	Q	1
●	●	🞄		●		R	4
●		🞄	●			S	,
		🞄	●	●	●	T	5
●	●	🞄	●			U	7
	●	🞄	●	●	●	V	=
●	●	🞄			●	W	2
●		🞄	●	●	●	🞄	/
●		🞄	●		●	Y	6
●		🞄			●	Z	+
		🞄		●		Carriage Return	Carriage Return
	●	🞄				New Line	New Line
●	●	🞄	●	●	●		Shift to Alphabet
●	●	🞄		●	●	Shift to Numbers
		🞄	●			Space	Space
		🞄				Not Used	Not Used

[1] Very probably a Soviet Union influence. I have no idea what this was used for - asking "Who you are?" maybe. ↩