6100 BSC Programming Manual

6100 BSC Concepts and Context
If the called station is not ready to continue, it can send
one of the following replies:
SYN SYN ... SYN id NAK PAD (The station is not ready to
receive.)
SYN SYN ... SYN WACK PAD (The station is temporarily
not ready to receive.)
The underscore shows the contents of the application buffer. NAK
is 15 hexadecimal in ASCII, 3D hexadecimal in EBCDIC. WACK is a
DLE character (10 hexadecimal) followed by a semicolon (3B
hexadecimal) in ASCII, a DLE character followed by a comma (6B
hexadecimal) in EBCDIC.
NOTE
To produce WACK in EBCDIC, the application puts in its
buffer the sequence 10 2C hexadecimal. In translating
the sequence from ASCII to EBCDIC, BSC translates the
10 to a 10, the 2C to 6B hexadecimal.
If the called station sends a NAK or WACK or doesn't answer at
all, the calling station can repeat its request, or either
station can disconnect the line with the sequence:
SYN SYN ... SYN DLE EOT PAD
The application makes a CONTROL request to send the disconnect
sequence.
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