Instructions Printed On Inside
828-397-4200 Voice
828-397-4415 Fax
http://www.elkproducts.com
PO Box 100 • Hwy. 70W • Hildebran, NC 28637 • USA
Data Bus Hub
ELK-M1DBH
APPLICATION:
The ELK-M1DBH is the ideal way to connect
multiple home run cables to the M1 Control. It is
designed for CAT5 or CAT6 cables with RJ45
plugsontheends. TheM1DBHdoesallthework
of series connecting the data lines (A & B) and
provides a clean, organized method for manag-
ing the data bus wires.
FEATURES:
•Designed For Multiple Home Run Cables
•Internally Connects Data A & B Lines From
Previous Device In to Next Device Out
•Provides up to Nine (9) Data Bus Connections
•Multiple Hubs May be Connected for Expansion
•EOL Bus Termination Can Be Done On-Board,
RJ45 Terminating Resistor Plug Included
•Mounting Plate for Structured Wire Boxes
SPECIFICATIONS:
•Input Connections: Elevator Screw Terminals
•Output Connections: RJ 45 8-Pin Jacks
•Mounting Plate Dimensions: 6.5" x 3" x .5"
•Circuit Board Dimensions: 5" x 2.5"
Data Bus Hub
ELK-M1DBH
021706
M1DBHDataBusHubInstallation
The M1DBH is pre-assembled on a 3" structured
wiring plate (ELK-SWP3), which mounts inside any
ELK Structured Wiring Enclosure. Four (4) black
push-pin style fasteners mount the plate to the
enclosure. If desired, the board may also be
removed from the plate and mounted with double
faced tape.
1. Connect the +VKP, Data A, Data B, and Neg data
bus terminals from the M1 board to the top four
(4) input terminals on the M1DBH board using a
(4) conductor cable.
2. Pull Category 5 Cable (CAT5) from each data bus
device to the control.
3. Terminate each CAT5 data bus cable with an
RJ45 plug using the appropriate crimping tool.
Use the 568A wiring standard (see wire color
codebelow). Note: RJ45 plugsare not included
withtheM1DBHdue tothegreatvarietyof
brandsand terminating toolswhich are subject
to dealer preference.
3. Following the color codes used in step 2 and the
wring diagram below, connect the CAT5 cable at
each device. The Pos & Neg wires connect
singularly to the Pos & Neg terminations (flying
lead wires or terminals) of the keypad, zone
expander, etc. However the data A & B lines are
connected to the device along with a "return" wire
so that the data returns back to the M1DBH, which
is then used to feed the next device. Effectively,
this puts the data lines in a series circuit so that
the control communcates with each device in a
progression or "daisy chain" fashion. The very
end of this daisy chain (which will be the two
return wires from the last data bus device)
requires a terminating resistor (see step 5). This
is very important due to the high speed of the M1's
RS-485 data bus communications.
4. Place each data bus cable into it's own RJ45 jack
on the M1DBH board starting with J1. If there are
more than 9 data bus cables, add a second
M1DBH and connect the short CAT5 jumper
(included) from J9 on the previous M1DBH board
to J1 on the next M1DBH board. This leaves 8
jacks on the first M1DBH and 8 on the second or
a total of 16 potential jacks (ports). Additional
M1DBH boards may be connected for more
cables.
5. Place the EOL resistor terminating plug (in-
cluded) into the first unused jack. This plug
places a 120 Ohm resistor across the A & B data
return lines coming from the last wired device,
effectively terminating the bus.
6. To connect more than 9 data bus runs, additional
M1DBH unit(s) may be connected together in a
daisy chain fashion. This connection requires a
"crossover" cable to be made using two (2) RJ45
connectors and a short length of CAT5 wire. See
diagram on back. Plug one end of the "cross-
over" cable into connector J9 on the first M1DBH.
Plug the other end into connector J1 on the next
M1DBH.
