User's Manual

PMAC2 PCI Lite Hardware Reference Manual – Preliminary Documentation
Base Board Connector Pinouts 33
TB1 (2/4-Pin Terminal Block)
This terminal block can be used to provide the input for the power supply for the circuits on the PMAC2
board when it is not in a bus configuration. When the PMAC2 Lite is in a bus configuration, these
supplies come through the bus connector from the bus power supply automatically; in this case, this
terminal block should not be used.
Pin# Symbol Function Description Notes
1 GND Common Reference voltage
2 +5V Input Positive supply voltage Supplies all PMAC digital circuits
3 +12V Input Positive supply voltage +12v to +15v; not required on-board;
used on J1 to supply analog inputs
4 -12V Input Negative supply voltage -12v to -15v; required for opt-12 ADCs;
used on J1 to supply analog inputs
Note: Unless Option 12 (Analog-to-Digital Converters) is included on the board, only pins 1 and 2 will be provided
on this terminal block.
TB2 (3-Pin Terminal Block)
This terminal block provides the output for PMAC2’s watchdog timer relay, both normally open and
normally closed contacts.
Pin# Symbol Function Description Notes
1 WD_NC Output Watchdog relay out Normally closed
2 COM Input Watchdog return +V or 0V
3 WD_NO Output Watchdog relay out Normally open
Note: The normally closed relay contact is open while PMAC2 Lite is operating properly — it has power and the
watchdog timer is not tripped. This contact is closed when the PMAC2 Lite is not operating properly (either the PMAC
has lost power or the watchdog timer has tripped). The normally open relay contact is closed while PMAC2 is
operating properly, and open when PMAC2 is not operating properly.