WARNING! The RS485 Data Bus must NEVER have more
that two (2) terminating resistors (jumpers). Reliability and
response will be affected!
ELK‐M1DBH Data Bus Hub connected to M1 Main Control
J2
J4
J6
J8
J1
J3
J5
J7
J9
Insert RJ45 Terminating Plug in 1st unused jack
and terminate the control at JP3.
DO NOT TERMINATE OTHER DEVICES
!
CAT5 Cables
NEG ‐
DATA B
+12V
DATA BUS
+VKP
DATA B
DATA A
NEG
EGND
J1
J2
JP
3
RS
‐48
5
DAT
A B
US
DATA A
M1 Main Board
J10
Keypad
Keypad
Keypad
Spare 1
Spare 2
+
A
B
‐
Mount M1DBH inside control.
Use 4 conductor cable to connect
to the M1 Data Bus terminals.
** SEE WARNING ABOVE
NOTE: RS‐485 Data Bus Max. wire length is 4000 ft. Total. Each CAT5 homerun from the M1DBH must be calculated as double the
running distance since the Data A & B lines travel out and then back (A1 & B1) where they are used to feed the next homerun.
The ELK‐M1DBH Data Bus Hub is for new installations where it is possible to run multiple CAT5/6 homerun cables. The RJ45 jacks allow neat and
organized connections. The third wire pair in the CAT5/6 cable is used to return the DATA lines back from each device where they are used to feed
the next adjacent jack. The result is the M1DBH circuitry daisy chains the devices by series connecting the DATA lines A & B. Termination is
accomplished with a plug‐in RJ45 terminator (supplied).
The CAT5/6 Cables must be continuous from the M1DBH to the Device terminals or flying lead harness on all the Keypads.
DO NOT MAKE ANY INTERMEDIATE SPLICES OR USE OTHER CABLES. We strongly recommend using CAT5/6 cable with the
largest available wire gauge. The longer the distances the more important it is to have larger gauge wire.
Terminating
Jumper
BLACK
RED
GREEN
WHITE
We recommend the M1DBH be mounted in close physical proximity to the M1
Control where possible. Two or more M1DBH boards may be connected in a
single daisy chain by closely following the diagram at bottom of this page.
Refer to Keypad
Instructions
for more info
about Output
and Zone Input
+
-
A
A1
B
B1
TO CONTROL
8 - Brown
7 - Wht/Brn
6 - Orange
5 - Wht/Blue
4 - Blue
3 - Wht/Org
2 - Green
1 - Wht/Grn
Pin1
RJ45 Plug
Blue pair is
unused
Color Code for CAT5 Data Bus Cables
Pin1
Fro
nt
vie
w
Optional programmable Zone Input
Optional programmable Output
-
+
N.C.
N.O.
2200
Ohm
EOL
To BLACK (Neg)
To BLACK (Neg)
Wht/Blue
Brown
Wht/Brn
Orange
Wht/Org
Green
Blue
Wht/Grn
RED +12V
BLACK (-)
GREEN
WHITE
BROWN
BLUE
Keypad
CAT5
or
CAT6
Cable
To (-) Neg
Black wire
Load (50mA max)
I.E. LED, Relay
Do NOT exceed 4,000 ft. max. Data Bus
distance. The length of each CAT5
homerun must be calculated as DOUBLE
its physical length.
BLACK
RED
GREEN
WHITE
Proper (allowed) method for Daisy Chaining two or more ELK‐M1DBH Data Bus Hubs
J2
J4
J6
J8
J1
J3
J5
J7
J9
Insert RJ45 Terminating Plug in 1st unused
jack and terminate the control at JP3.
DO NOT TERMINATE OTHER DEVICES
!
CAT5 Cables
J10
Keypad
Keypad
A Crossover cable (diagram below) must be plugged into the first unused port of the first M1DBH to port J1 on the next M1DBH.
8 ‐ Brown
7 ‐ Wht/Brn
6 ‐ Orange
5 ‐ Wht/Blue
4 ‐ Blue
3 ‐ Wht/Org
2 ‐ Green
1 ‐ Wht/Grn
Pin1
RJ45 Plug
CAT5 or
CAT6 Cable
Pin1
Fr
ont v
iew
1 ‐ Wht/Org
2 ‐ Orange
3 ‐ Wht/Grn
4 ‐ Blue
5 ‐ Wht/Blue
6 ‐ Green
7 ‐ Wht/Brn
8 ‐ Brown
Pin1
RJ45 Plug
Pin1
CROSSOVER CABLE
Orange pair "swaps" position
with Green pair
J2
J4
J6
J8
J1
J3
J5
J7
J9
J10
Keypad
Keypad
CAT5
Crossover
Cable
The data bus must appear as a single series circuit, meaning a single daisy chain type of
connection. Never attempt to multi‐spoke multiple M1DBH’s off a single M1DBH.
NO Terminating Plug here!
The CAT5/6 Cables must be continuous from the M1DBH to the Device terminals or flying lead harness on all the Keypads.
DO NOT MAKE ANY INTERMEDIATE SPLICES OR USE OTHER CABLES. We strongly recommend using CAT5/6 cable with the largest available wire gauge. The
longer the distances the more important it is to have larger gauge wire.
WARNING: Never use any cable other than a good quality CAT5 cable with the M1DBH ports.
Never attempt to splice or extend any of the M1DBH port cables using ordinary multi-conductor
cable! Elk Products will not support or approve any deviance from these instructions.
