ADLINK PCI-8102 User Manual

Page 35

Signal Connections

motor driver if it is equipped with: (1) a differential line driver or (2)
an open collector output.

Connection to Line Driver Output

To drive the PCI-8102 encoder input, the driver output must pro-
vide at least 3.5V across the differential pairs with at least 6mA
driving capacity. The grounds of both sides must be tied together.
The maximum frequency will be 6.5Mhz or more depends on wir-
ing distance and signal conditioning.

Connection to Open Collector Output

To connect with an open collector output, an external power sup-
ply is necessary. Some motor drivers can provide the power
source. The connection between the PCI-8102, encoder, and the
power supply is shown in the diagram below. Note that an external
current limiting resistor R is necessary to protect the PCI-8102
input circuit. The following table lists the suggested resistor values
according to the encoder power supply.

If max power = 6mA

Encoder Power (V)

External Resistor R

+5V

(None)

+12V

1.8k

+24V

4.3k

External Encoder / Driver
With line driver output

Inside
8102

A,B phase signals
Index signal

EA+,EB+,EZ+

EA-, EB-, EZ-

EGND

GND