8 – 20 HEIDENHAIN Technical Manual TNC 426, TNC 430
8.4 Data Transmission Protocols
8.4.1 Selection of Transmission Protocols
The operating modes are assigned the following transmission protocols:
The following applies to all data transmission protocols except LSV2:
If an incoming file is already stored in the TNC, the TNC will ask you whether
you really wish to overwrite this file:
7
77
7 Press a soft key to continue the transmission.
If you attempt to overwrite a write-protected file, the TNC displays the error
message Protected file!:
7
77
7 Press the ADDITIONAL FUNCTION UNPROTECT soft key to cancel write-
protection and continue the transmission.
If a file has been read out and the data transfer menu has been terminated
with the END key, the TNC outputs the characters <EXT> and <EOT>.
If a transmission is terminated with the END key, the error message “Program
incomplete” is issued.
Operating modes Transmission protocol
FE1 and FE2 Select a protocol with BCC and with fixed
control characters
1 start bit, 7 data bits, 1 stop bit
EXT1, EXT2, EXT3 Select data format and transmission protocol
using machine parameters
LSV2 Start this protocol from a PC or from the TNC.
The protocol runs in the background of the
TNC.
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