Bosch D185 Specsheet

Fire Alarm Systems | D185 Reverse Polarity Signaling Module

D185 Reverse Polarity Signaling Module

www.boschsecurity.com

u UL Listed for NFPA 72 remote station applications

u Adjustable alarm and supervisory output current

u Alarm activation delay

The D185 Reverse Polarity Signaling Module
communicates system conditions (alarm, trouble, and
supervisory) from a compatible control panel to a
monitoring station by reversing or interrupting the
polarity of a steady signal it sends over leased
telephone company (telco) lines. The module operates
over one or two pairs of lines and with either a 12 VDC
or 24 VDC supply. All circuits are power limited.

Functions

Operation on Telco Phone Lines

Operation on a Single Pair of Telco Lines
If a single pair of telco lines is connected, the module
signals an alarm condition by reversing the polarity of
the telco output. It responds to a trouble condition by
interrupting the current of the telco output. If the
module receives an alarm signal when it is in a trouble
condition (current interrupted), it restores current and
reverses polarity. The alarm output has a 20 sec delay
(± five seconds).
Operation on Two Pair of Telco Lines
If a second pair of telco lines is connected, the module
signals a supervisory condition by reversing the
polarity of the supervisory output. The current

u System test mode with LED indicator

u Easy installation

received at the monitoring station is adjusted by signal
adjusters on the module board, one for the alarm and
trouble output and one for the supervisory output.

Test Mode

The switch-activated test mode indicates a trouble
condition at the control panel and a trouble condition
at the monitoring station. The test mode is shown on
the module board by a light-emitting diode (LED).

Easy Installation

Mounting the D185 in existing systems is simple with
snap-track installation.

Certifications and approvals

Complies with NFPA 72

Region Certification

USA UL UOJZ: Control Units, System (ANSI/UL

864) and UOXX: Control Unit Accesso­ries, System (ANSI/UL 864)

FM D185

CSFM see our website

FDNY-

#6173

CoA

2 | D185 Reverse Polarity Signaling Module

Region Certification

FDNY-

#6174 UL 864 9th Edition

CoA

NYC-

12-92-E, Vol. 12

MEA

NYC-

12-92-E, Vol. 14

MEA

NYC-

12-92-E, Vol. 15

MEA

Installation/configuration notes

Compatibility Information

The following Bosch control panels are compatible
with the module:

Active:

FPD-7024 panel

G Series (GV2 and higher) panels

1

Legacy:*

D7024 panel

G Series (prior to GV2) panels

2

D9412, D7412, and D7212** panels

DS9400 panel

1

G Series (GV2 or higher) = GV4 (D9412GV4, D7412GV4, and
D7212GV4**), GV3 (D9412GV3, D7412GV3, and D7212GV3**), and
GV2 (D9412GV2, D7412GV2, and D7212GV2**) panels

2

G Series (prior to GV2) = D9412G, D7412G, and D7212G** panels

* Legacy products were investigated to comply only to UL864 8th
edition.

** indicates products which are not UL listed for commercial fire
applications.

The following Bosch relays are compatible with the
module:

D275 End-of-Line Module

PAM-4 Relay Module

Parts included

Quant. Component

1 D185 module

1 Snap-Track to fit module

1 Literature pack

Technical specifications

Environmental Considerations

Environment: Indoor, dry

Input (alarm, supervisory, and trouble)

Current: 2.25 mA to 8.1 mA

Voltage (nominal): 12 VDC or 24 VDC

Mechanical Properties

Alarm Activation Delay: 20 ± 5 sec

Dimensions (W x H): 5.875 in. x 3 in. (15 cm x 7.6 cm)

Output

Current Adjustment

2.5 mA to 15 mA

Range:

Power Requirements

Current Draw (alarm): 12 VDC: 300 mA; 24 VDC: 143 mA

Current Draw (idle): 12 VDC: 245 mA; 24 VDC: 120 mA

Ordering information

D185 Reverse Polarity Signaling Module

This module’s three input terminals accept alarm,
trouble, or supervisory input from a control panel. The
module transmits this information over either a single
set or a pair of leased telco lines to a monitoring
station. This module operates with either a 12 VDC or
24 VDC supply.

Order number D185

Mounting Considerations

The D185 mounts on a supplied snap-track and installs
in the FACP enclosure or in a separate, adjacent
enclosure connected to the FACP by conduit or other
protection against wiring damage. The snap‑track is
slotted and drilled for quick installation.

Wiring Considerations

The D185 has twelve screw terminal connection
points. The six on the left side are input points; the six
on the right side are module output points. The screw
terminals accept wires with diameters between
22 AWG (0.5 mm) and 12 AWG (2.3 mm).