PMAC Product Guide E34A-E38: Encoder Sample Clock These jumpers are related to an advanced feature and should not be changed from default. E40-E43: Servo and Phase Clock Direction Control These jumpers are related to an advanced feature and should not be changed from default. Encoder Configuration Jumpers E24-E27: Encoder Complementary Line Control These jumpers, one per encoder, control the voltage to which the complementary channels A/, B/, and C/ are pulled. The default setting for each jumper, connecting pins 1 and 2, ties the complementary lines to 2.5V. This setting is required for single-ended encoders and is best if the channel is left unconnected.
If encoders with differential line drivers are used, the setting of these jumpers does not matter. Changing the jumpers to connect pins 2 and 3 ties the complementary lines to 5V. This setting is used for (now obsolete) complementary open-collector encoders, or if external exclusive-or loss-of-encoder circuitry is used. The following table shows which jumper affects which encoder channel: E22-E23: Control-Panel Handwheel Enable These jumpers are related to an advanced feature and should not be changed from default. E72-E73: Control Panel Analog Input Enable These jumpers are related to an advanced feature and should not be changed from default.
PMAC Jumper Configuration 13 Default Configuration E34A E34 E35 E36 E37 E38 OFF ON OFF OFF OFF OFF Default Configuration E40 E41 E42 E43 ON ON ON ON Default Configuration E24 E25 E26 E27 1-2 1-2 1-2 1-2 ENC1 ENC2 ENC3 ENC4 E27 E26 E25 E24 Default Configuration E22 E23 OFF OFF Default Configuration E72 E73 OFF OFF