VIONiC RESM20/REST20 angle encoder system
17
Electrical connections
Grounding and shielding
Shield
Output
signals
5 V
Readhead
termination/connector
0 V
Customer
electronics
VIONiC readhead
IMPORTANT:
The shield should be connected to the machine earth (Field Ground).
For JST variants the ferrule should be connected to 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
Standard RS422A line receiver circuitry.
Capacitors recommended for improved noise immunity.
Customer
electronics
120R
A B Z−
Cable Z
0
= 120R
Readhead
A B Z+
0 V
0 V
220 pF
220 pF
Single ended alarm signal termination
(Not available with ‘A’ cable termination)
Readhead
Customer
electronics
5 V
1k8
4k7
4k7
100nF
100R
E−
Limit output
(Not available with ‘A’ cable termination)
5 V to 24 V
R*
P Q
* Select R so that maximum current
does not exceed 10 mA.
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.