ADLINK PCI-8134A - Manual (Page 31)

Signal Connections
• 21
differential signal pairs will be converted to digital signal EA, EB and EZ to
connect to Motion ASIC.
Here are two examples of connecting the input signals with the external
circuits. The input circuits can connect to the encoder or motor driver,
which are equipped with: (1) differential line driver or (2) open collector
output.

Connection to Line Driver Output
To drive the PCI-8134/PCI-8134A encoder input, the driver output must
provide at least 3.5V across the differential pairs with at least 6 mA driving
capability. The ground level of the two sides must be tight together too.

Connection to Open Collector Output
To connect with open collector output, an external power supply is
necessary. Some motor drivers also provide the power source. The
connection between PCI-8134/PCI-8134A, encoder, and the power supply
is shown in the following diagram. Please note that the external current
limit resistor R is necessary to protect the PCI-8134/PCI-8134A input circuit.
The following table lists the suggested resistor value according to the
encoder power supply.
Encoder Power(VDD) External Resistor R
+5V
0Ω (None)
+12V
1.8kΩ
+24V
4.3kΩ
If=6mA max.
For more detail operation of the encoder feedback signals, please refer to
section 4.4.
External Encoder / Driver
With line driver output PCI-8134/PCI-8134A
A,B phase signals
Index signal
EA+,EB+,EZ+
EA-, EB-, EZ-
EXGND GND