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Unidirectional Control Connections
Manual Control (contact closure) ports
These four ports are dedicated contact input ports, used exclusively to control the
corresponding power output ports. When the circuit between a signal pin and a ground pin
is closed, each port turns on the corresponding AC power output port.
•
•
Rear Panel
IP
P L
L
EX
X P
P
PD
D
U4H
1 2
G
MAC
C :
00-0
0 5-A6-
-
XX-XX-XX
S/N:
####
# ###
E######
L A
L
A N
3 4
G
N
N
O
O
O
C
C
C
M ANU AL
C ON T RO L
R E
R
E
L
L
A Y
Y
Y
G
Ground
4
Output 4
3
Output 3
Figure 8.
Manual control mode
Manual control mode is one of the three control modes for the IPL EXP PDU4H. Manual
control mode, in which these ports are used to control the on and off status of the AC
power outputs, is enabled at all times. The IPL EXP PDU4H does not need to be configured,
nor connected to a network, in order to control the on oroff state of the AC output ports.
Manual control takes precedence over the other two modes (SIS‑over‑SSH mode and
Secure Platform Device mode).
When a manual control port is tied to ground (closed), the corresponding AC
power output is on. The power output for that port remains on for as long as the manual
control port is closed. Once a manual control port is closed (manual control is on), this
port state overrides any other commands (program, configuration, SIS commands) for
the power port.
When the manual control port is open, the corresponding power port is either
off, or it follows the state determined by the configuration, program, or SIS‑over‑SSH
command.
Manual Control (Contact closure)
Each port senses external switch or contact closure by
using a 1k ohm pull-up resistor in a TTL (5 VDC) circuit.
These ports are for exclusive selection and control of
the corresponding switched AC outputs.
Share the same ground
among contact input
Ground
connections.
Wire
Nut
Switch
Device 4
Device 3
Manual Control Contact Closure Port
Front Panel
SWITCHED AC
1
2
Switched
AC Power
LEDs
Light when the
corresponding
manual control
port is active
(tied to ground,
logic low) and the
AC output is on.
(Switches
or similar
items)
IPL EXP PDU4H • Hardware Features and Installation
3/16"
(5 mm)
Max.
7/8"
(22 mm)
3
4
Heat Shrink on
Outer Jacket
to Inner
Conductor
Transition
Extron
STP 20-2P Cable
TIP: STP 20-2P cable,
shown above, is
recommended for
these connections. For
best results, insulate
the common or drain
wires using heat shrink.
17
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