D
ELTA
T
AU
P
OWER
PMAC
R
EFERENCE
JULY
-2015
P
OWER
PMAC
UMAC
465
CPU
B
OARD
H
ARDWARE
R
EFERENCE
12
PMAC CPU acts as the host computer and various peripheral devices can be connected through
this port.
Probably the most common peripheral device used on this port is the “USB stick” flash drive. The
Power PMAC CPU board will automatically recognize standardly formatted flash drives
connected to this port. It is even possible to boot the CPU from this drive if the proper boot files
are present on the drive. It is also possible to use USB peripheral devices such as true disk drives
and keyboards.
USB Flash Memory Port (P2)
The USB Flash Memory Port is labeled “P2” on the PCB. It is a “Micro-B” format connector
located just below the cooling fan for the CPU. With this port, the Power PMAC CPU board acts
as a flash memory stick providing internal directory structure and file access from a Windows PC
while the board is unpowered.
RS-232 Connection
The Power PMAC UMAC 465 CPU board provides one RS-232 port on the front panel, at the
top. The connector is an IDC 10-pin connector, with the pinout arranged such that a flat cable
crimped to an IDC 10-pin header at this end and a 9-pin D-sub connector at the other end will
provide a standard RS-232 connection. The Delta Tau ACC-3L cable provides this connectivity.
Watchdog Timer Connection (TB1)
The Power PMAC UMAC 465 CPU board provides a dedicated connector for the output of the
on-board watchdog timer. This 3-point removable terminal block is on the bottom edge of the
board, near the front end. The solid-state relay output on this connector can be used for fail-safe
shutdown of power circuitry in case of timer trip or loss of controller power.
Optional PCI Express Connection
The Power PMAC UMAC 465 CPU board optionally provides one PCI Express connector on the
“back side” of the board (the left side when looking at the rack from the front). This permits the
installation of PCI Express expansion cards inside the rack provided there is space available in
the rack to the left of the CPU board, such as video cards, vision systems, and additional Ethernet
ports in the Power PMAC system.
PCIe (x4) Connector (P18)
The P18 connector near the top of the back side of the CPU board provides a “times 4” (x4 – four
serial channels) PCI Express connection. It is considered Port 1/Slot 1 by the CPU. PCI Express
“x1” and “x4” accessories can be installed in this connector. This connector is in the right-angle
configuration. The PCIe accessory board will be parallel to the CPU board, and the assembly will
occupy 2 or 3 slots in the UMAC rack.
LED Indicators
D10: This is a dual colored LED. When this LED is green, it indicates that power is applied to the
+5V input when this LED is red, it indicates that the watchdog timer has tripped.
D12: This is a red colored LED. When this LED is lit it indicates that the “Power Good”
subsystem has failed.
