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HEIDENHAIN Service Manual for Data Interfaces
Diagram no. 11
 
RS-232-C/V.24 direct connection for hardware handshake, 
 
TNC 25-pin / peripheral 25-pin (1:1)
Diagram no. 12
 
RS-232-C/V.24 direct connection for software handshake, 
 
TNC 25-pin / peripheral 25-pin (1:1)