Xantech Troubleshooting, Specifications, MRKP2 basic dimensions and cable lengths

5. Troubleshooting

Symptom	Possible Cause	Solution
		Verify wiring pin-out and RJ-
	1. RJ-45 plug crimped	45 crimp. Correct by re-
		crimping RJ-45 to CAT-5
	incorrectly; or wiring pin-
		cable.
	out of RJ-45 reversed.
	2. Break or intermittent	Check RJ-45 to RJ-45
MRKP2 does not power		connections with cable tester
	connection in CAT-5
up or resets itself		or voltmeter. +12V terminal
	between Zone and “Head-
randomly		on back of MRKP2 should
	End”.
		read +9V DC or higher with
	3. CAT5 cable length	the keypad on.
	exceeds specification, or	Use MRC44CB1 and
	more than one keypad is
		782ERGPS 12V High Current
	used in a zone.
		AC Adaptor at keypad side,
		prior to the first keypad.
The Next button on	Protect switch on
touchscreen or any	MX88/MRC88m is left in	Return the Protect switch to
other virtual button in	Off position. Protect Off
		On position and reset the
top right corner of the	setting is only to be used
		MX88/MRC88m system
screen is not	during the QuickConfig
operational	setup.
	1. Wiring: Incorrect wiring	Verify and correct wiring.
	between MRKP2 and
	MRC88m.
No control of IR	2. IR emitter defective at	Replace IR emitter.
sources	source.
	3. IR Enable jumper is set	Make sure IR Sensor Enable
		jumper is properly configured.
	incorrectly
		(See Section 3 and Figure
		3.1)
		Check to see if ambient light
		is shining on built in IR

6. Specifications

MRKP2 basic dimensions and cable lengths

Front panel dimensions	4-1/2” (114mm) wide x 4-5/8” (117mm) high x 1/4”
	(6mm) deep
Wall cutout	Depends on electrical back-box used – see below
Mounting depth	2-1/4” (57mm) for unit and wiring – actual
	mounting depth will depend on electrical back-box
	used
Max length Cat-5	250 feet (75 meters) total per zone* If this
	distance is exceeded, a MRC44CB1 and
Cable* with 1 keypad
	782ERGPS should be placed right before the
per zone
	keypad.
	Must use MRC44CB1 connecting block and
Max length Cat-5	782ERGPS 12V High Current AC adaptor at
	and before the first keypad. After the first
cable* with 1 keypad
	keypad, each time a cable run exceeds 250
and 1, 2, or 3
	feet (75 meters) total, another MRC44CB1
expansion keypads
	and 782ERGPS will need to be added before
	the next keypad.
Operating Temperature	32-104°F (0-40° C)
& Humidity	0-90% Relative Humidity
Compatible Electrical back-boxes
North American	Carlon® BH235A, B232A-UPC, B225R-UPC,
standard two gang
	or BH234R
electrical back boxes

* CAT5/5e/6/7 may be used. Cable quality may reduce this maximum length.

		receiver or in direct line with
		plasma TV noise. If the IR
Intermittent IR source	IR flooding	emitter is flashing when IR is
control		not being sent, IR flooding is
		likely cause. Disable the built-
		in IR Receiver. Consider use
		of an external IR Receiver
		(see Fig 2.2 and 3.2).

Extending external IR receiver connection with 3-wire cable

Size (AWG)	Maximum allowable
	length (feet)
24	150
22	300
20	1000
18	2000

Extending external IR receiver connection

with Cat-5 cable using all 8

conductors

Use 4 striped wires for GND

Use 2 solid wires for IR signal

Use 2 solid wires for +12V

18

19