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Appendix C-PDU Daisy-Chain Function
How to switch between Host and Guest PDUs on the Web
interface?
Functionality supported by daisy-chained PDUs will have the Host/
Guest # drop down menu displayed on the Web interface (as
shown below).
New LCD PDU Daisy-Chain Function Introduction
PDU81xxx/ 71xxx/ 41xxx/ 31xxx
The daisy-chain function allows up to four PDUs to be connected together to
be monitored and controlled from one IP address.
When PDUs are connected, two roles are defined: Host and Guest. Up to three
Guest PDUs can be connected to one Host PDU. The Guest PDUs will be
recognized by serial number and their order within the daisy-chain.
Note:
To perform the daisy-chain function, the firmware version of the
connected PDUs needs to be the same (v1.07 or above).
How to connect the PDUs together?
Use one Ethernet cable and connect one end of it to the daisy-chain (Out) port
on the Host PDU and the other end to the daisy-chain (In/ENV) port on the
Guest 1 PDU to connect the PDUs (as shown below).
Copyright © 2018 Cyber Power Systems, Inc. All rights reserved.
What remote management protocols are supported in PDU daisy-chains?
Currently users can monitor and control daisy-chained PDUs through Web
interface (HTTP/HTTPS) or SNMP protocols.
What functions on the Web pages does daisy-chain support?
Please find in below table:
Host PDU
Out port
Guest #1 PDU
In/ENV port
How to switch between Host and Guest PDUs on the Web interface?
Functionality supported by daisy-chained PDUs will have the Host/ Guest #
drop down menu displayed on the Web interface (as shown below).
Host
Guest #1
Guest #2
Guest #3
Ethernet
PDU
Device Status
Outlet Status
Device Manager
Outlet Manager
Outlet Control
Outlet Schedule
Log
Status Records
Energy Records
Graphing
System
Identification
Summary
Can I upgrade the firmware version of the Guest PDUs through
the Host PDU?
Yes, you can upgrade the firmware using the Upgrade and
Configuration Utility, FTP (network connection required), or USB
port. Once the Hostcompletes the PDU firmware upgrade, it will
trigger its Guest PDUs to upgrade the firmware automatically. It
takes about 5 minutes for the Guest PDUs to upgrade, regardless of
the number of PDUs in the series.
What will happen if an Ethernet cable is disconnected in the PDU
daisy-chain?
For example, if four PDUs are connected and the cable connecting
Guest 1 and 2 is disconnected, then Guest 2 and 3 will no longer be
detected by the Host PDU. An event showing that Guest 2 and 3
are removed will be recorded in the Host PDU. Meanwhile, Guest 2
and 3 will create a new daisy-chain where Guest 2 becomes a Host
and Guest 3 becomes Guest 1 to the new Host.
Can I upgrade the firmware version of the Guest PDUs through the Host PDU?
Yes, you can upgrade the firmware using the Upgrade and Configuration Utility,
FTP (network connection required), or USB port. Once the Host completes the
PDU firmware upgrade, it will trigger its Guest PDUs to upgrade the firmware
automatically. It takes about 5 minutes for the Guest PDUs to upgrade,
regardless of the number of PDUs in the series.
What will happen if an Ethernet cable is disconnected in the PDU daisy-chain?
For example, if four PDUs are connected and the cable connecting Guest 1 and 2
is disconnected, then Guest 2 and 3 will no longer be detected by the Host PDU.
An event showing that Guest 2 and 3 are removed will be recorded in the Host
PDU. Meanwhile, Guest 2 and 3 will create a new daisy-chain where Guest 2
becomes a Host and Guest 3 becomes Guest 1 to the new Host.
In the above example, if the disconnected Ethernet cable is re-connected, will
the role of the PDUs stay the same?
Yes, when the disconnected cable between Guest 1 and 2 is re-connected,
Guest 2 and 3 will revert to their previous roles.
What happens if one PDU in the daisy-chain is powered off?
For example, if four PDUs are connected and Guest 1 is powered off, an event
showing that Guest 1, 2 and 3 are removed will be recorded in the Host PDU.
Guest 2 and 3 will not create another daisy-chain.
Does the Host PDU record the logs of the Guest PDUs and itself?
Yes, the Host PDU records the logs from all Guest PDUs daisy-chained to it.
Will the Logs of the Guest PDUs recorded in the Host PDU be cleared if the
Guest PDUs are removed from the Host PDU?
No, the Logs of the Guest PDUs will remain even after the Guest PDUs are removed.
Does the Host PDU record the Status Records of the Guest PDUs and itself?
Yes, the Host PDU records the Status Records for all the PDUs in the
daisy-chain.
Will the Status Records of the Guest PDUs logged in the Host PDU be cleared
if the Guest PDUs are disconnected from the Host PDU?
Yes, once the Guest PDUs are removed, the Status Records logged in the Host
PDU will be cleared. As long as the Host PDU does not connect to other PDUs,
the Status Records of the disconnected PDU can be displayed when it is
re-connected to the Host PDU. If the Host PDU connects to different PDUs, the
Status Records of the removed PDU will be entirely cleared.
K01-E000006-01
Cyber Power Systems, Inc.
www.cyberpowersystems.com
Problem
The PDUs are
connected but the
daisy-chain function is
not working.
I cannot set the
EnergyWise
configuration on a
Guest PDU.
I cannot set the WoL
for Guest PDUs.
Possible Cause
- The firmware version
does not support
daisy-chain.
- The PDUs have
different firmware
versions.
Only the Host PDU
supports EnergyWise.
Only the Host PDU
supports WoL.
Solution
Check the firmware
version of each PDU
and upgrade it to v1.07
or above.
N/A
N/A
Troubleshooting
Host
Guest #1
Guest #2
Host
Guest #3
Guest #1
Ethernet
Are the Guest PDUs able to connect to the network when they are
daisy-chained?
Yes, even when the PDUs are daisy-chained, the Guest PDUs are able to
connect to the network directly. Note that a Guest PDU will require having its
own Ethernet cable connected to the network.
What will happen if a 5
th
PDU is added to a daisy-chain?
The maximum number of PDUs that can be connected in one daisy-chain is 4.
The daisy-chain functionality will not work until the fifth PDU is removed.
What is the maximum recommended length of the Ethernet cable to
daisy-chain the PDUs?
50 ft (15 m)
In the above example, if the disconnected Ethernet cable is re-
connected, will the role of the PDUs stay the same?
Yes, when the disconnected cable between Guest 1 and 2 is re-
connected, Guest 2 and 3 will revert to their previous roles.
What happens if one PDU in the daisy-chain is powered off?
For example, if four PDUs are connected and Guest 1 is powered
o, an event showing that Guest 1, 2 and 3 are removed will be
recorded in the Host PDU. Guest 2 and 3 will not create another
daisy-chain.
Does the Host PDU record the logs of the Guest PDUs and itself?
Yes, the Host PDU records the logs from all Guest PDUs daisy-
chained to it.
Will the Logs of the Guest PDUs recorded in the Host PDU be
cleared if the Guest PDUs are removed from the Host PDU?
No, the Logs of the Guest PDUs will remain even after the Guest
PDUs are removed.
