PMAC Product Guide PMAC JUMPER CONFIGURATION On the PMAC, there are many jumpers (pairs of metal prongs), called E-points. Some have been shorted together; others have been left open. These jumpers customize the hardware features of the board for a given application. For example, some of these jumpers set the baud rate for serial communications while others determine the type of amplifier enable signals that PMAC can output. In the following description, a jumper that by default is not present or removed is indicated as OFF. A jumper that is present or installed is indicated as ON. For a three-position jumper, the proper configuration will be indicated either 1-2, 2-3 or OFF.
For the location of each configuration jumper refer to the Universal PMAC Lite Connectors and Indicators section of this manual. Power-Supply Configuration Jumpers E85, E87, E88: Analog Circuit Isolation Control The PMAC-Lite board circuitry is divided in two parts that can be electrically isolated from each other. The analog circuitry interfaces, among other signals, the amplifier control lines like the DAC (± 10V) command output and amplifier enable and fault signals. The digital circuitry includes the CPU as well as the encoder input circuitry. These jumpers control whether the analog circuitry on the PMAC-Lite is isolated from the digital circuitry, or electrically tied to it.
In the default configuration, these jumpers are off, keeping the circuits isolated from each other (provided separate isolated supplies are used). PMAC Jumper Configuration 11 Default Configuration E85 E87 E88 OFF OFF OFF