PMAC Product Guide I/O Configuration Jumpers E1-E2: Machine Output Supply Configure Chip U26 on the Universal PMAC Lite controls the general-purpose digital outputs on connector J5 JOPTO. With the default sinking output driver IC (ULN2803A or equivalent) in U26, these jumpers must connect pins 1 and 2 to supply the IC correctly. If this IC is replaced with a sourcing output driver IC (UDN2981A or equivalent), these jumpers must be changed to connect pins 2 and 3 to supply the new IC correctly. Warning: The jumper setting must match the type of driver IC, or damage to the IC will result. E7:
Machine Input Source/Sink Control Default Configuration E7 1-2 With this jumper connecting pins 1 and 2 (default), the machine input lines on the J5 JOPTO port are pulled up to +5V or to the externally provided supply voltage for the port. This configuration is suitable for sinking drivers. If the jumper is changed to connect pins 2 and 3, these lines are pulled down to GND. This configuration is suitable for sourcing drivers. E17A - E17D: Amplifier-Enable Polarity Control Jumpers E17A through E17D control the polarity of the amplifier enable signal for the corresponding motor 1 to 4.
When the jumper is OFF (default), the amplifier-enable line for the corresponding motor is low true so the enable state is low-voltage output and sinking current, and the disable state is not conducting current. With the default ULN2803A sinking driver used by the PMAC-Lite, this is the fail- safe option allowing the circuit to fail in the disable state. With this jumper ON, the amplifier-enable line is high true so the enable state is not conducting current, and the disable state is low-voltage output and sinking current. Generally, this setting is not recommended. The following table shows which jumper affects which channel:
PMAC Jumper Configuration 19 Default Configuration E1 E2 1-2 1-2 Default Configuration E17A E17B E17C E17D OFF OFF OFF OFF AENA1 AENA2 AENA3 AENA4 E17A E17B E17C E17D