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Output specifications
(continued)
Digital output signals
Form – Square wave differential line driver to EIA RS422A.
Incremental *
2 channels A and B in quadrature (90 ° phase shifted)
Signal period
A
B
Reference *
Z
†
Set-up
Ti interfaces
1
Voltage at X
0
Signal level
0
Setup signal voltage proportional to incremental signal amplitude
Alarm *
Differential line driven output
Ri and Ti interfaces
Interface
model
Ri0004
Ri0008
E
Ri0020
> 15 ms
Ri0040
Ri0100
Ri0200
Ri0400
* Inverse signals not shown for clarity.
†
Set-up signals as shown are not present during calibration routine.
ATOM linear installation guide
All ACi interfaces, Ri interfaces and Ti digital interfaces.
Resolution
Synchronised pulse Z, duration as resolution
100%
Interface
Alarm asserted when
model
< 40% signal
Ti
Overspeed
< 20% signal
> 130% signal
ACi interfaces and Ri digital interfaces
During normal operation
3.3 V (nom)
Voltage at X
0
50%
Signal level
0
3-state alarm
ACi, Ri and Ti interfaces
Differentially transmitted signals forced open circuit for > 15 ms when alarm conditions valid.
Alarm asserted when
(Ri and Ti alarm conditions same as differential line driven output. ACi alarm conditions:
< 40% signal or overspeed)
< 20% signal
> 135% signal
Overspeed
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.
70%
100%
47
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