GV21001e_e_A5.doc / Jul-07
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A, B and Z may at any time also be independent single signals, e.g. from proximities, photocells
etc. Since the level of every channel is selected individually (see DIL-switch), it is possible to
use different levels on the inputs. Consequently it is e.g. possible to take the position
information from the A, /A, B and /B channels of a RS422 encoder, but to add the
corresponding Z index pulse as a HTL signal from a remote photocell
With HTL signals, the switching threshold lies between 6.5 and 8 volts. The input uses an
internal pull-down resistor of 5kOhms.
Every of the two input terminals provides two auxiliary voltage outputs for easy encoder supply:
+5.2 volts/125 mA and +24 volts*/125 mA
*) Output = power supply voltage – 2 volts
1.7.
Outputs
The outputs provide push-pull characteristics. When set to TTL/RS422 level, the corresponding
output swing is always 5 volts. When set to HTL, the output swing depends on the power
supply input (12 – 30volts).
All outputs are short-circuit-proof.
At any time the signal and the appropriate inverted signal are both available at the output, even
when no inverted signal is applied to the input.