Parker ACR8020, Hardware Manual

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Chapter 2, ACR8020 Motherboard Hardware Set-Up 13
ACR8020 MOTHERBOARD JUMPERS
Encoder Pull-up Select Jumpers (JP5-JP14)
The ACR8020 is capable of handling various types of incremental open-collector and line
driver encoders. Care must be taken to setup each channel to match the encoder type as
described below:
The encoder options for the ACR8020 are selectable as follows:
Encoder
Options
Encoders Supplied
None Not Applicable
5 1,2,3,4, and 8
10 1,2,3,4,5,6,7,8, and 9
Open Collector Encoders:
When using open-collector encoders, the encoder channels must be pulled to 5 or
+12 volts, depending upon the application. Pulling up to +12 volts provides higher noise
immunity, but causes a slower response time. For high frequency applications (encoder
rates higher than 1 megahertz) the +5 volt pull-up section may be necessary.
Line Driver Encoders:
When using line driver (or balanced pair) encoders, the corresponding resistor pack
should be removed from it’s socket. Leaving the resistor pack in the socket can cause
faulty encoder operation and possibly severe encoder damage. Optionally, the resistor
pack can be replaced with an 8-pin isolated resistor pack to supply termination resistance
for the balanced signal pairs.
Pull-up Selection:
The following table lists the pull-up jumper settings for each encoder:
WARNING
Wiring a line driver encoder with the pull-up selected to
+12 volts will permanently damage the encoder.