17
Data (measured values or parameters) can
be transferred bidirectionally between
position encoders and subsequent
electronics with transceiver components in
accordance with RS-485 (differential
signals), in synchronism with the clock
signal (CLOCK) produced by the
subsequent electronics.
Dimensioning
IC
1
= RS 485 differential line receiver and
driver
C
3
= 330 pF
Z
0
= 120
−
Encoder
Subsequent electronics
Input Circuitry of the Subsequent Electronics
Data transfer
Incremental signals
depending on
encoder
Connecting elements
For the encoders with EnDat 2.2 interface
without incremental signals, 8-pin M12
connecting elements are used. M12
connector technology is in wide use in
industrial applications and has the following
advantages:
Cost-effective connection technology
•
Smaller dimensions
•
Simpler cable feed through in machines
•
Thinner connecting cables (
•
¬
6 mm
instead of the previous 8 mm)
Higher reliability thanks to injection-
•
coated connection technology
Integrated lock mechanism as vibration
•
protection
Connection Technology
Cables
Transmission frequencies up to 16 MHz in
combination with large cable lengths place
high technological demands on the cable.
HEIDENHAIN cables are equal to this task,
not least because of a cable construction
conceived specifi cally for this application.
We recommend using original
HEIDENHAIN cable.
Due to the data transfer technology, the
adapter cable connected directly to the
encoder (
¬
†
4.5 mm) must not be longer
than 20 m. Greater cable lengths can be
realized with a max. 6 m adapter cable and
an extension cable (
¬
6 mm).