V.11) - HEIDENHAIN iTNC 530 Service Manual

13.7.3 RS-422 (V.11)
The RS-422-/V.11 data interface has the same pin layout at the iTNC (connector X28, X128) and
at the V.11 adapter block (D-sub connector on the switch cabinet).
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Note
You find detailed information on cables and cable layouts for serial data transfer in the help
menu of TNCremoNT under the catchword "Cable assembly".
Caution
For data transfer via RS-232-C or RS-422 HEIDENHAIN recommends using an "Opto
Bridge".
This serial adapter connector ensures metallic isolation via optocoupler and can thus protect
the serial interface against overvoltage, different load potentials and interference voltages
on the ground lines.
"Opto bridges" are available in specialized computer stores.
Please note:
If the machine manufacturer has already mounted an "Opto Bridge", a further opto bridge
will not function, as such components must be powered from both sides!
HEIDENHAIN Service Manual iTNC 530