DMD 8860 - Reference; Keypad Bus Wiring Specifications; Compatibility; Ordering Information

8860 Installation and Programming Guide | Digital Monitoring Products 16
REFERENCE
Keypad Bus Wiring Specifications
▶ DMP recommends using 18or 22-gauge unshielded wire for all keypad and AX-Bus/LX-Bus circuits. Do not
use twisted pair or shielded wire for AX-Bus/LX-Bus and Keypad Bus data circuits. All 22-gauge wire must be
connected to a power-limited circuit and jacket wrapped.
▶ When powering an 8860 from the keypad bus, to maintain auxiliary power integrity when using 22-gauge wire
do not exceed 100ft. When using 18-gauge wire do not exceed 500ft. To increase the wire length or to add
devices, install an additional power supply that is listed for Fire Protective Signaling, power limited, and regulated
(12/24VDC nominal) with battery backup.
▶ Maximum distance for any one bus circuit (length of wire) is 2,500ft regardless of the wire gauge. This distance
can be in the form of one long wire run or multiple branches with all wiring totaling no more than 2,500ft. As wire
distance from the panel increases, DC voltage on the wire decreases. Maximum number of AX-Bus/LX-Bus devices
per 2,500ft circuit is 40.
▶ Maximum voltage drop between the panel (or auxiliary power supply) and any device is 2VDC. If the voltage at
any device is less than the required level, add an auxiliary power supply at the end of the circuit. When voltage is
too low, the devices cannot operate properly.
For additional information refer to the panel’s Installation Guide.
Compatibility
▶ XT30/XT50 Series Panels with Version 221 or higher
▶ XR150/XR550 Series Panels with Version 221 or higher
Ordering Information
Keypads
8860-B 8860 7-Inch Touchscreen Keypad (black)
8860-W 8860 7-Inch Touchscreen Keypad (white)
Note: Each panel allows a specific number of supervised keypads.