XT2640 Operating Manual
13 July 2016
Page 112 of 187
21
SHARING
MEASUREMENTS
AND
ACTIVITIES
WITHIN
MULTIPLE
INSTRUMENTS
If option MU is installed then certain measurements and activities can be shared between two or more XT2640 instruments. This
provides the following capabilities –
Up to 1000 XT2640s may be interconnected using this capability.
The SYNC measurement mode which allows VPAs within a single XT2640 to have synchronous measurement starting and
period (see section 12.4.1) is extended to accomplish this among multiple XT2640s configured using this measurement mode.
All XT2640s measurements can be held or released simultaneously from any XT2640.
All XT2640s integrations can be started and/or stopped from any XT2640.
All XT2640s historical data collection can be started or stopped simultaneously from any XT2640.
All XT2640s share their IN, MID and OUT power totals and display the total of all XT2640s and show the overall system
efficiency data.
Any VPA in any XT2640 can make its’ fundamental available to any other VPA(s) in any other XT2640(s) by using one of the 3
available global fundamental frequencies.
21.1
INTERCONNECTING
MULTIPLE
XT2640S
XT2640s with option MU perform these abilities by communicating with each other via their LAN interfaces. You do not need to be
using the LAN interface for communicating with the units via a computer as that can be accomplished using a different interface if
desired, or there can be no interfacing to a computer.
21.1.1
INTERCONNECTING
NOT
USING
THE
LAN
INTERFACE
WITH
A
COMPUTER
In this case the individual XT2640s should typically be configured to use the AUTO‐IP LAN interface mode. This allows the individual
instruments to determine their own IP addresses and discover each other automatically.
Note:
If only 2 XT2640s are to be interconnected then simply use a standard LAN cable (CAT5e recommended) between the LAN ports
of the XT2640s without connecting them to a network. A cross‐over cable is not required, but may be used if desired.
If more than 2 XT2640s are to be interconnected then a switch or hub must be used, with each XT2640 LAN port connected to
ports on that switch or hub. In situations where a great many units are to be interconnected then multiple switches or hubs
may be used.
The individual XT2640s can be connected to each other via an existing network if desired. All such instruments must be visible
to each other on that network. In this case it may be desirable to use DHCP or FIXED IP LAN modes instead of AUTO‐IP.
21.1.2
INTERCONNECTING
WHILE
ALSO
USING
THE
LAN
INTERFACES
WITH
A
COMPUTER
In this case the XT2640s communicate with each other over the LAN network to which each unit is connected using whatever LAN
configuration is required for the network. All such instruments must be visible to each other on that network.
Note:
The XT2640s communicate with each other using UDP port 10734, such traffic must be able to be communicated between the
XT2640s through any intermediate routers. The XT2640 uses IGMP to attempt to manage any routers, managed switches, or
“snooping” switches, to allow the transmission of such traffic.
21.1.3
HAVING
SEVERAL
GROUPS
OF
XT2640S
WITHIN
A
SINGLE
NETWORK
Each XT2640 can be configured to operate its multi‐unit capabilities within a defined group number. This is configured by you on
the Multi‐Unit Configuration Screen (see below) and can be any numeric value between 0 and 255 inclusive. There is no particular
significance to the group number other than only XT2640s configured for the same group number provide the multiple unit
capabilities. Each group may have up to 1000 members, and there may be 256 such groups, so the maximum number of XT2640s
which can be connected to the same LAN segment is 256,000.
21.2
CONFIGURING
MULTI
‐
UNIT
CAPABILITY
Each XT2640 used within an interconnected multi‐unit group needs to be configured for which group number they are a member of,
and which global fundamental data (if any) is being provided by each VPA in the XT2640. This achieved by using the MULTI‐UNIT
button from the Interface configuration screen as follows –
Press the Interface information area on most screens to access the Interface Configuration screen.
Press the MULTI‐UNIT button at the top of this screen to access the Multi‐Unit Configuration screen (an example of this screen is
shown below).
Either turn OFF multi‐unit capabilities, or turn them ON and select the multi‐unit group number using the OFF/GROUP n button
at the top of this screen.
For each configured VPA within this XT2640 you can select for that VPA fundamental to be provided globally to all XT2640s
within the multi‐unit group by selecting that it be provided to all units as the GFUND1, GFUND2 or GFUND3 data. Note –
o
Only a single unit and a single VPA within that unit can provide data to any given GFUND data.
