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Output specifications
Digital output signals
Form – Square wave differential line driver to EIA RS422A (except limits P and Q)
*
Incremental
2 channels A and B in quadrature (90° phase shifted)
Signal period P
Resolution S
A
B
*
Reference
Z
Synchronised pulse Z,
duration as resolution.
Bi-directionally repeatable.
Limits Open collector output, asynchronous pulse
(Not available with 'A' cable termination)
Active high
Repeatability < 0.1 mm
P Q
~
Length of limit actuator
Alarm
Line driven (Asynchronous pulse)
(Not available with 'A' cable termination)
E−
Alarm asserted when:
– Signal amplitude < 20% or > 135%
– Readhead speed too high for reliable operation
> 15 ms
or 3-state alarm
Differentially transmitted signals forced open circuit for > 15 ms when alarm conditions valid.
*
Inverse signals not shown for clarity.
†
Only calibrated reference mark is bi-directionally repeatable.
VIONiC RESM20/REST20 angle encoder system
Resolution
P
S
option code
(µm)
(µm)
D
20
5
X
4
1
Z
2
0.5
W
0.8
0.2
Y
0.4
0.1
H
0.2
0.05
M
0.16
0.04
P
0.1
0.025
I
0.08
0.02
O
0.04
0.01
Q
0.02
0.005
R
0.01
0.0025
NOTE: A wide reference mark option, outputting a
reference pulse for the duration of the signal period
is available.
†
Contact your local Renishaw representative for more
information.
18
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