PMAC Quick Reference Guide INSTALLING AND CONFIGURING PMAC Jumpers Setup On the PMAC, there are many jumpers (pairs of metal prongs), called E-points (on the bottom board of the PMAC STD they are called W-points). Some have been shorted together; others have been left open. These jumpers customize the hardware features of the board for a given application. Each jumper configuration should be checked using the appropriate hardware reference for the particular PMAC being set. Further instructions for the jumper setup can be found in the PMAC User manual. After all the jumpers have been properly set, PMAC can be installed either inside the host computer or linked with a serial cable to it.
Serial Connections For serial communications, use a serial cable to connect the PC’s COM port to the PMAC’s serial port connector (J4 on PMAC PC, Lite, and VME; J1 on PMAC STD’s bottom board). Delta Tau provides cables for this purpose: Acc-3D connects PMAC PC or VME to a DB-25 connector; Acc-3L connects PMAC Lite to a DB-9 connector; and Acc-3S connects PMAC STD 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. If using the Acc-26 Serial Communications converter, connect from the PC COM port to Acc-26 with a standard DB-9 or DB-25 cable and from Acc-26 to PMAC using the cable provided with Acc-26.
Since the serial ports on PMAC PC and PMAC VME are RS-422, this accessory can be useful to provide the level conversion between RS-232 and RS-422 (communications is possible without this conversion, but at reduced noise margin). Because the conversion is optically isolated, the accessory also helps prevent noise and ground loop problems. If a cable must be made, the easiest approach is to use a flat cable prepared with flat-cable type connectors as indicated in the following diagrams: DB-9 Female IDC-10 Do not connect wire #10 DB-25 Female IDC-26 Do not connect wire #26 Installing and Configuring PMAC 21 1 1 1 1