27
Operational Overview
drive’s 5 volt logic supply so external pull-ups and biasing circuitry is not required. When
proper installation techniques are followed as shown below, the differential input setup will
provide a more robust and noise immune system than a single ended input setup.
Differential input is recommended under any of the following conditions:
• Pulse width < 2 µs
• Pulse frequency > 250 kHz
• Pulse command cable length > 25 feet
• Noisy electrical environments
Differential input circuit specifications:
Input frequency maximum 2 Mhz
Input device: AM26C32
Input impedance 12 Kohms each input
Maximum voltage applied to input pins (A, A/) or (B, B/ )
Single Ended (referenced to 0V drive logic) +/-10V
Differential (referenced to mating differential input) +/-10V
Maximum common mode voltage +/-7 V
Minimum differential voltage required 200 mV
Input voltage hysteresis 60 mV
Single ended input circuit specifications:
Single ended input specifications:
1 MHz maximum input frequency
Internal 330 ohm pull-up to 5 volt (non-isolated)
1.5 volt low level
3.5 volt high level
ECI-44 Terminal
Command
Connector Pin #
Pulse-Direction
Signal
Pulse-Pulse
Signal
Pulse Quadrature
Signal
Sync Enc In “A” 27 Pulse Pulse + A
Sync Enc In “A/” 41 Pulse/ Pulse +/ A/
Sync Enc In “B” 40 Direction Pulse - B
Sync Enc In “B/” 26 Direction/ Pulse -/ B/
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