HEIDENHAIN TNC 306 Technical Manual - Manual (Page 447)

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TNC 406/TNC 306 4 Data transfer with BCC 3/97
4 Data transfer with BCC
4.1 General
HEIDENHAIN TNCs, as well as allowing data transfer with the standard data transmission protocol,
also allow data transfer with a Block Check Character (BCC).
This protocol is only set in FE1 mode:
In the following, the transmission protocols are listed for the various file input and output
possibilities. In FE1 mode, a command sequence which requests the directory from the peripheral
device is automatically output at the start if the function "Download selected program" was selected.
If an error occurs at a peripheral device, the following block must be sent to the TNC.
<SOH>"Error text"<ETB>BCC
Peripheral unit
<SOH> "Error" <ETB> BCC <DC1>
Transmission path
<EOT> <ACK>
TNC
The received error message is displayed in the TNC, but can be acknowledged and erased with the
CE key.