Reference Manual

PMAC-PCI Hardware Reference
36 Machine Connection
Compare Equal Outputs Port (JEQU Port)
The compare-equals (EQU) outputs have a dedicated use of providing a signal edge when an encoder
position reaches a pre-loaded value. This is useful for scanning and measurement applications.
Instructions for use of these outputs are covered in detail in the PMAC’s User Manual.
Outputs can be configured sinking or sourcing by replacing the chips U37 or U53 and configuring the
jumpers E101-102 or E114-E115. The voltage levels can be individually configured by removing resistor
packs RP43 or RP56 and connecting an external pull-up resistor in each output to the desired voltage
level.
Serial Port (JRS422 Port)
For serial communications, use a serial cable to connect your PC’s COM port to the PMAC’s J4 serial
port connector. Delta Tau provides the Acc-3D cable that connects the PMAC PCI to a DB-25 connector.
Standard DB-9-to-DB-25 or DB-25-to-DB-9 adapters may be needed for a particular setup. Jumper E110
selects between RS-232 and RS422 signals type for the J4 connector. If a cable needs to be made, the
easiest approach is to use a flat cable prepared with flat-cable type connectors as indicated in the
following diagram: