Begin a message with
Attention.
Move smartly from one letter position to the next.
Do not send faster than your receiver can copy.
To send a double letter, pull flags in, then back out.
Between words use
Interval.
Between sentences send
Interval twice.
End a message with
Interval three times.
To send digits, use
Numerics, then use:
A for 1
B for 2
C for 3
D for 4
E for 5
F for 6
G for 7
H for 8
I for 9
J for 0