HEIDENHAIN TNC 306 Technical Manual - Manual (Page 434)

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TNC 406/TNC 306 2 TNC data interfaces 8-21
The software handshake can easily be achieved when transmitting with a BCC. At first 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
.