JP1
Terminating Jumpers (JP1 - JP5)
JP1 = Terminates Input from Control
JP2 = Terminates Branch 1
JP3 = Terminates Branch 2
JP4 = Terminates Branch 3
JP5 = Terminates Branch 4
See details about Data Bus Termination.
ELK-M1DBHR †
DATA BUS HUB FOR RETROFIT
ELK PRODUCTS, INC. HILDEBRAN, N.C., 28637, USA
JP2 JP3 JP4 JP5
BLACK
RED
GREEN
WHITE
AB-
+
INPUT
FROM CONTROL
Mount inside main M1 Control and connect to
Data Bus terminals using short 4 conductor cable.
RED
GREEN
WHITE
BLACK
A
+B-
DATA BUS
BRANCH 1
RED
GREEN
WHITE
BLACK
Keypad
A
+B-
DATA BUS
BRANCH 2
Keypad
Keypad
Branch 1 Example:
1 Homerun with 1 Keypad
Place terminating jumper on the Keypad/
Bus Device AND on JP2 of the M1DBHR.
Branch 2 Example:
2 Homeruns with 1 Keypad on each
Place terminating jumper on BOTH Keypads and
remove jumper JP3 on M1DBHR.
Branch 3 Example:
2 Homeruns with 2 Keypads & 1 Expanders on
first, and 1 Keypad and 1 Expander on second.
(Devices must be Daisy chain wired on each
homerun so they appear in series.)
Jumper
Terminate
these two
devices.
DO NOT Jumper Terminate
these devices.
Keypad
Keypad
Keypad
RED
GREEN
WHITE
BLACK
A
+B-
DATA BUS
BRANCH 3
Jumper
Terminate
these two
devices.
Jumper Terminate
this device AND
JP2 on the
M1DBHR.
DO NOT Jumper JP3.
DO NOT Jumper JP4.
If using 1 M1DBHR place jumper on JP1 of the M1DBHR and JP3 of the M1 Control.
With 2 M1DBHR boards place jumper on JP1 of both M1DBHR boards and remove jumper JP3 on the M1 Control.
DO NOT EXCEED two (2) terminating jumpers on any of the 4 branches of the M1DBHR or the main M1 bus.
Place terminating jumper on
the LAST device connected to
each homerun and remove
jumper JP4 on M1DBHR.
Like the Main M1 Bus, the Maximum wire length of any of the 4 branches on the M1DBHR is 4000 ft.
+VKP is protected with
1.25A PTC
The ELK-M1DBHR † Data Bus Hub Retrofit is intended for retrofit jobs where existing 4 conductor cables are the only wires available. It creates 4
managed RS-485 BRANCHES from the single M1 main RS-485 Bus. Like the main M1 Bus, each branch can only have 2 home run cables (4
branches x 2 ea. = 8 home runs).
DO NOT connect more than two (2) M1DBHR Hubs to a single M1 Control.
DO NOT connect an M1DBHR on a branch of another M1DBHR! The M1DBHR CANNOT be used as an extender or remote repeater.
DO NOT remote M1DBHR(s) away from the M1. Mount within main M1 Control. Terminate last (end line) device on each home run.
Min. wire gauge: 24 AWG 18 to 22 AWG is best for long distances.
END-OF-LINE DATA BUS TERMINATION IS VERY IMPORTANT !
All bus devices (keypad, expanders, etc.) have terminating jumpers. Placing a shorting header on the jumper engages a 120 Ohm
resistor across data A & B lines. Refer to the individual instruction manuals and Control hardware pack for shorting headers.
RED
GREEN
WHITE
BLACK
Jumper Terminate
these this device.
DO NOT Jumper Terminate
these devices.
ELK-M1KP
Keypad
Keypad
A
+B-
DATA BUS
BRANCH 4
Branch 4 Example:
1 Homerun with 2 Keypads & 1 Expander
(Devices must be Daisy chain wired)
Place terminating jumper on the
LAST device and JP5 on 1DBHR.
NEG -
DATA B
+12V
DATA BUS
+VKP
NEG
J1J2
JP3 Teminating Jumper
RS-485 DATA BUS
DATA A
M1 Control Board
Jumper Terminate
JP3 on Control and
JP1 on M1DBHR.
DATA A
DATA B
The above examples are intended to show the flexibility provided by the 4 data bus branches of an M1DBHR.
The number and types of devices used on each branch is up to the Installer.
NOTE: As additional data bus devices are added to the
Control the total calculated current draw must be
considered. If total current draw exceeds the limits of the
control, add an auxiliary 12 VDC Power Supply.
JP1
ELK-M1DBHR
DATA BUS HUB
FOR RETROFIT
NEG -
DATA B
+12V
DATA BUS
+VKP
DATA B
DATA A
NEG
J1J2
JP3 Teminating Jumper
RS-485 DATA BUS
DATA A
BLACK
GREEN
WHITE
M1 Control Board
AB
AC
XFMR
+
-
12 VDC
Aux.
Power
Supply
+
-
-
RED
BLACK
+
INPUT
FROM CONTROL
Do Not Connect +VKP to the
M1DBHR if it is being powered from
an Aux. Power Supply.
Connect all Negatives (-) together to
form a "common" negative path.
12V Battery
