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Electrical connections
Grounding and shielding
VIONiC readhead
Readhead
termination/connector
Shield
IMPORTANT: The shield should be connected to the machine earth (Field Ground).
For JST variants the ferrule should be connected to the machine earth.
Maximum readhead cable length: 3 m
Maximum extension cable length: Dependent on cable type, readhead cable length and clock speed.
Contact your local Renishaw representative for more information.
NOTE: The maximum cable length between the readhead and the ADTi‑100 is 3 m.
Recommended signal termination
0 V
Readhead
A B Z+
120R
Cable Z
= 120R
0
A B Z−
0 V
Standard RS422A line receiver circuitry.
Capacitors recommended for improved noise immunity.
Single ended alarm signal termination
(Not available with 'A' cable termination)
5 V
Customer
4k7
Readhead
electronics
1k8
100R
E−
100nF
4k7
VIONiC REXM20/REXT20 installation guide
Customer
electronics
5 V
0 V
Limit output
(Not available with 'A' cable termination)
220 pF
Customer
electronics
5 V to 24 V
R*
P Q
* Select R so that maximum current
does not exceed 10 mA.
220 pF
Alternatively, use a suitable relay
or opto-isolator.
Remote CAL operation
CAL
0 V
Remote operation of the CAL/AGC
is possible via CAL signal.
Output
signals
15
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