Renishaw ATOM Installation Manual page 59

Digital output signals
Form – Square wave differential line driver to EIA RS422A.
All ACi interfaces, Ri and Ti digital interfaces.
Incremental 1
2 channels A and B in quadrature (90 ° phase shifted)
Signal period
A
B
Reference 1
Z
1
Inverse signals not shown for clarity.
2
Set-up signals as shown are not present during calibration routine.
Resolution
Synchronised pulse Z, duration as resolution
Set-up 2
(Ti digital interfaces)
1
Voltage at X
0
0
Signal level
Set-up signal voltage proportional to incremental signal amplitude
During normal operation
(ACi interfaces and Ri digital interfaces)
3.3 V (nom)
Voltage at X
0
0 50% Signal level
Between 50% and 70% signal level, X is a duty cycle.
Time spent at 3.3 V increases with incremental signal level.
At > 70% signal level X is nominal 3.3 V.
100%
70% 100%
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