Bosch Appliances MX938I Wiring, Configuration Jumpers, Address Switch Settings

Hint: Mounting to removable ceiling tiles is not recommended unless a sandwich is made of the base, ceiling tile and a back plate behind the tile. Covers used for four-inch octagonal and square boxes make a suitable back plate (when used with bolts and wing nuts, as an example).

•Replace the enclosure on the base.

•Select an Optical Module (AR8-13 or AR13-18).

-For ceilings between 8 and 13 ft. (2.4 m and 4.0 m) from the floor, use the optical module marked AR8-13. This marking can be found next to the two optical module tabs. For ceilings between 13 and 18 ft. (4.0 m and 5.5 m) high, use the optical module marked AR13-18.

-To replace an optical module, push the optical module tabs toward the center until the module snaps free of the circuit board. Holding the new module by the tabs, snap the new module into place.

Avoid fingerprints on the mirrored surfaces. If the mirrored surfaces become soiled or otherwise marked, they can be cleaned using a soft, clean cloth and any commonly available mild window cleaner.

4.0Wiring

Only apply power after all connections have been made and inspected.

	MUX			AUX
	BUS			POWER
• Connect wiring as shown.	B+	B-	+	-
	IN	IN	IN	IN
	1	2	3	4

NOTE: Do not coil excess wiring inside unit.

•Seal the Wire Entrance using the foam plug provided.

Terminal Descriptions

•1 (B+) and 2 (B-):Connect to the Multiplex Bus of the control panel. Use no smaller than #22 AWG (0.8 mm) wire between the detector and the control panel.

•3 (+) and 4 (-):Connect to the AUX Power of the control panel. This connection is only required if LED operation (other than during the walk test) is required. Use no smaller than #22 AWG (0.8 mm) wire between the detector and the control panel.

5.0Configuration Jumpers

Configure the detector using the appropriate Configuration Jumper settings (refer to the following diagram for jumper locations).

Sensitivity

Jumper

Signal

Gain

Jumper (located under the mirror)

LED

Operation

Jumper

Address

Switches

5.1LED Operation Jumper

• ON: Allows the LED to operate when activated by alarm.

• OFF: The LED will not operate on alarm.		On
	If the detector is powered by the MUX Bus only,		OFF
	the LED is for Walk Test purposes only. Disable		ON
			OFF
	the LED when Walk Testing is complete. To		ON
	disable the LED, place the jumper in the OFF
	position.If the detector has AUX Power Off
	supplied, the LED operation may be left ON during normal
	use.

5.2Sensitivity Mode

• Standard Sensitivity: Recommended setting for Standard

maximum false alarm immunity. Tolerates	H
environment extremes on this setting, but requires the	I
largest amount of intruder motion to achieve an alarm.	S

•Intermediate Sensitivity: Recommended setting for Intermediate

any location where an intruder is expected to cover		H
only a small portion of the protected area. Tolerates		I
normal environments on this setting. This setting		S
will improve your intruder catch performance.
• High Sensitivity: Fast response to intruder signals.	High
For use in quiet environments where thermal and
		H
illumination transients are not anticipated.
		I
5.3 Signal Gain		S

NOTE: The MX938i permits selection of the signal gain depending upon the environment to be protected. The gain select jumper is located under the optical module.

•	High Gain:	Recommended for large coverage	High Gain
	applications up to 60 ft. (18.3 m) in diameter. The		HI
	MX938i is shipped in this setting. If the gain jumper is		LO
	missing, it will default to high gain.

• Low Gain: Recommended for applications where the	Low Gain
area to be covered is 40 ft. (12.2 m) or less in diameter	HI
and for applications where the High Gain setting may	LO
be too sensitive for environmental extremes.

NOTE: Setting the MX938i for the LOW Signal Gain setting reduces

the Coverage area to 40 ft. (12.2 m) in diameter.

6.0Address Switch Settings

•Set the address switch settings (see page 3) before connecting the MX938i to the multiplex bus.

No two devices may be set to the same address. Having two or more units set to the same address may prevent

IMPORTANT fault detection or cause multiplex bus failure.

•You can find the Address Switch Settings using the chart on page 3, or by calculating the decimal number of the address.

O	1	2	3	4	5	6	7	8
N

128 64 32 16 8 4 2 1

Binary Switch Values (Point 17 shown)

Zone (Point) Addresses 001 through 008 are reserved for "on board" points on the DS7400(Xi) Series control panels.

IMPORTANT	Do not set any multiplex devices for Addresses 001-
	008 when using a DS7400(Xi) Series control panel.

Page 2 © 2004 Bosch Security Systems MX938i Installation Instructions