Power-State Logic; Computer Power - Pioneer 2 / PeopleBot Operation Manual

Appendix B: Motor-Power Board Connectors
which output controls the computer's DC:DC voltage converter.
for crash-less shutdown of the computer in the event of a power brownout or for
unattended shutdowns, if Vpp drops below 10 VDC, the comparator automatically
initiates a two-minute delay before computer power (not system-wide) shutdown.
Similarly, when the computer power is manually switched OFF, the comparator is
grounded (below 10 VDC, of course) and the same two minute-delayed shutdown
occurs.
In all cases, power shutdown, but not necessarily computer software shutdown, is
canceled if power is restored to above 10 VDC, either by connecting a battery charger
or by hot-swapping the batteries.
With older Motor-Power systems, you may disable the two-minute delay circuitry
(switched or low-voltage shutdown immediate) by moving the jumpers on both J3 and
J6 on the Motor-Power Board to the pins opposite their ON position.

Power-State Logic

A 9-pin DSUB receptacle (P1) on the Motor-Power board provides a logic-level shutdown
indicator (DCD pin 1) which state goes low when computer power shutdown is first
initiated. The onboard computer may use this line state to initiate software-mediated
shutdown, such as provided by genpowerd for RedHat
Table 24. Power State 9-pin DSUB receptacle (P1)
1
DCD

Computer Power

A common 4-conductor, bevel-keyed connector (J5) provides 5
VDC @ 7A power for the onboard computer, and battery power
for the optional 12VDC fan.
64
2 3 4 5
nc nc pin 6 nc
10-20K adj.
across 4 & 6
Linux PCs.
©
6 7 8 9
pin 4 nc nc Gnd
Table 25. Computer power connector
Designed to provide
Pin # Connection
1
Vpp
2
Gnd
3
Gnd
4
5VDC @ 7A