Chapter 1, Hardware Installation
11
Motherboard Jumpers
Encoder Pull-up Select (continued)
Line Driver Encoders:
When using line driver (or balanced pair) encoders, the corresponding resistor pack
should be removed from its socket. Leaving the resistor pack in can cause faulty encoder
operation and possibly cause severe encoder damage. It does not matter what pull-up
voltage is selected when the resistor pack is removed. 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.
Table 1.5 Encoder pull-up jumpers
ENC Resistor Jumper
+5V +12V
0 RP1 JS21
1-2
*2-3
1 RP2 JS22
1-2
*2-3
2 RP3 JS23
1-2
*2-3
3 RP4 JS24
1-2
*2-3
4 RP5 JS25
1-2
*2-3
5 RP6 JS26
1-2
*2-3
6 RP7 JS27
1-2
*2-3
7 RP8 JS28
1-2
*2-3
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