HEIDENHAIN TNC 335 Technical Manual - Manual (Page 528)

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TNC 360 2 TNC data interfaces 8-21
The software handshake is very easy to achieve when transmitting with a BCC. The receiver sends
neither a positive () nor a negative acknowledgment (), and the transmitter waits until
it receives one of these characters. When the buffer in the receiver is again capable of accepting
data, it again sends an and the transmitter continues its data transmission.
It is also possible, however, to conduct the software handshake with control characters and
. If hardware handshake (EXT) has been selected, it is identical to standard data transfer and
to data transfer with a BCC (see Section "Freely configurable interfaces").