ELK-AEDBHR — Alarm Engine Retrofit Data Bus Hub Installation Instructions

Installation instructions for the ELK-AEDBHR Data Bus Hub Retrofit — an "active" RS-485 data bus hub designed for retrofit jobs where an Alarm Engine control is replacing an older panel that has multiple homerun 4-conductor keypad/data wires.

Application

The AEDBHR splits the main 485 data bus into 4 managed 485 branches, each capable of supporting 2 parallel homerun cables (total of 8 homeruns). It's designed with terminating jumpers for each branch that, when appropriately paired with terminating jumpers on end-of-line devices, ensure proper operation and supervision.

Features

• Splits the Alarm Engine RS-485 data bus output into 4 managed branches
• Each managed branch can have 2 parallel homerun cables (total of 8 homeruns)
• Removable terminal blocks for easy wiring
• Works with standard 4-conductor homerun wire
• Includes mounting glides for ELK-SWB boxes

Specifications

Mounting

1. The AEDBHR can be mounted inside the Alarm Engine enclosure on the left or right side of the board using the supplied ELK-SWG Circuit Board Glides. If all mounting locations are consumed, install an additional ELK-SWB14 or ELK-SWB28 enclosure.
2. The ELK-SWG glides attach to the enclosure at strategically placed 2-hole punch patterns (one hole is smaller for a 6/32 "F" mounting screw, the larger hole is for a half-moon locator tab on the bottom of each glide).
3. Starting at the top, loosely start a 6/32" mounting screw in the small hole of the first 2-hole pattern. Place the slotted edge of a board glide under the screw so the half-moon tab fits into the larger hole with the grooved edge facing down, then tighten. Install a second glide in the pattern 4" below, with the grooved edge facing up.
4. Slide the AEDBHR board into the grooves provided by the glides — it should slide freely. Adjust a glide if too loose or tight.

Wiring Connections

1. Turn the control panel master power switch OFF.
2. Use a 4-wire cable to connect the Alarm Engine Data Bus terminals (+BUS 12V, Data A, Data B, Neg) from the control to terminals (+, A, B, –) on the AEDBHR.
3. Make all connections per the detailed wiring diagram. Install terminating jumpers as directed. Jumper shunts are included in the ELK-SWG package.
4. Power up the control.

Remember: Any data bus devices added to the control must be enrolled using the ElkConnect app.

Branch Configuration Rules

• DO NOT connect more than two (2) AEDBHR hubs to a single Alarm Engine Control.
• DO NOT connect an AEDBHR on a branch of another AEDBHR — it cannot be used as an extender or remote repeater.
• DO NOT remote AEDBHR(s) away from the Alarm Engine — mount within the main enclosure.
• Terminate the last (end-of-line) device on each homerun.

Branch Wiring Examples

End-of-Line Data Bus Termination

END-OF-LINE DATA BUS TERMINATION IS VERY IMPORTANT. All bus devices (keypads, expanders, etc.) have terminating jumpers. Placing a shorting header on the jumper engages a 120 Ohm resistor across the data A & B lines. Refer to individual instruction manuals and the control's hardware pack for shorting headers.

• Using 1 AEDBHR: place a jumper on JP1 of the AEDBHR and JP3 of the Alarm Engine Control.
• Using 2 AEDBHR boards: place a jumper on JP1 of both AEDBHR boards, and remove JP3 on the Alarm Engine Control.
• Do not exceed two (2) terminating jumpers on any of the 4 branches or the main Alarm Engine bus.
• Maximum wire length of any branch on the AEDBHR (like the main bus) is 4000 ft.
• Minimum wire gauge: 24 AWG (18–22 AWG best for long distances).

Note: Do not connect +BUS 12V to the AEDBHR if it's being powered from an Aux Power Supply. As additional data bus devices are added, consider total calculated current draw — if it exceeds the control's limits, add an auxiliary 12VDC power supply, connecting all negatives (–) together to form a common negative path.

ELK Products, Inc. — 3266 US Hwy 70, Connelly Springs, NC 28612, USA — 828-397-4200 — www.elkproducts.com