H u d s o n M a n u a l / R e v . 1 . 2 1
1 6
T
EKNIC
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I
NC
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P H O N E ( 5 8 5 ) 7 8 4 - 7 4 5 4
Encoder Signaling
Differential encoders on a Hudson motor have balanced, driven outputs
intended to drive terminated, twisted pair transmission lines. Differential
signals offer excellent common-mode noise immunity and support longer
cable runs than single-ended signaling.
Technical Note
The differential encoder output is driven from an AM26C31 differential line
driver optimized for 120
Ω
transmission lines. Refer to the AM26C31 data
sheet for complete specifications.
Differential encoder
signal
complement
To Servo Drive
74HC14
AM26C31
24
Ω
ENC I
ENC A
ENC A
ENC B
ENC B
encoder disk
Motor
read head
(one pulse per revolution)
Differential encoder output
Differential encoder signals provide excellent common mode noise immunity,
especially over longer transmission ranges (up to 100 feet). In many
applications, such as plasma cutting, differential encoder signals are superior
to single-ended signals.