HEIDENHAIN iTNC 530 Service Manual page 203

D-sub adapter connector 25-pin
To test the data transfer lines;
display by LEDs
D-sub adapter connector 25-pin
To cross the data transfer lines
D-sub adapter connector
Adapts 25-pin connector to 9-pin connector
Background:
The adapter block RS -232-C on the electrical cabinet
usually has a 25-pin connector, the COM interface on the
laptop usually a 9-pin connector.
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