Ademco K3852 Users Manual

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K3852K3852

CellularCellular

Control Channel TransceiverControl Channel Transceiver

Installation and Setup GuideInstallation and Setup Guide

EGISTRATION

K3852V1 2/99

Table of Contents

List of Terms...................................................................................................................................................2

Section 1. General Information .......................................................................................................................3

Introduction.......................................................................................................................................3

System Features ................................................................................................................................3

Section 2. Quick Start/Programming Guide....................................................................................................4

Section 3. Installation and Setup.....................................................................................................................6

Removing the Lower Cover..............................................................................................................6

Initial Power-Up Sequence ...............................................................................................................7

Selecting a Radio Installation Site ....................................................................................................8

Testing the Installation......................................................................................................................9

Section 4. Programming the K3852 ..............................................................................................................10

Using a 7720P Programming Tool..................................................................................................10

Subscriber Information....................................................................................................................11

Pulse/Delay Zone Selection ............................................................................................................12

Inverted Zone Selection ..................................................................................................................13

Restoral Reporting Zone Selection .................................................................................................14

Open/Close, Telco, Tamper Zone Selection ...................................................................................15

System Options...............................................................................................................................15

Redundant Central Station Reporting .............................................................................................16

Exiting Program Mode, Setting Defaults and Assigning Passwords...............................................17

Section 5. Registration ..................................................................................................................................18

Section 6. Mounting and Wiring...................................................................................................................21

Section 7. Operation Overview .....................................................................................................................26

Section 8. Keyboard Commands...................................................................................................................28

Section 9. Troubleshooting............................................................................................................................30

UL Requirements ..........................................................................................................................................32

Specifications................................................................................................................................................34

Summary of Connections Diagram ...............................................................................................................35

List of Terms

AMPS: Acronym for Advanced Mobile Phone System, which is the existing analog mobile phone

system used for cellular communication in North America.

A Side / B-Side: The FCC has divided the spectrum allocated to cellular communication between two

carriers in each geographic location: A and B. The “B” side is operated by the local telephone company (known as wireline), while the “A” side is run by a competitor (known as non-wireline).

Cell: The equipment, including antennas, RF transmitters, RF receivers, that is used to

establish and route communications between a mobile cellular radio and its intended end point.

Control Channel: Any one of several dedicated RF channels that are used by a cellular radio to register its

MIN with a local cell and to periodically check in with that cell. The control channel is also used by the radio to “dial” a phone number through the cell. Additionally, control channels are used by the cell to “ring” a mobile cellular radio.

MIN: Acronym for Mobile Identification Number, which is a cellular radio’s unique, 10-digit

“phone number.”

SS7: Acronym for Signaling System Seven, which is the network that is used by all telephone

companies for dialing and establishing all cellular and land-line phone calls.

Voice Channel: Any one of many dedicated RF channels used for transmitting and receiving audio data

between a mobile phone and a cell. (Not used with the K3852.)

– 2 –

Introduction

The K3852 is the subscriber end of the AlarmNet C reporting system. It is comparable to a digital communicator, but instead of transmitting signals over the telephone lines, it transmits radio signals to the central monitoring station using the control channel of the AMPS cellular phone network. This allows faster and more secure reporting and greater coverage.

The K3852 is compatible with existing installations using ADEMCO equipment or other control panels. It can be used in conjunction with digital communicators on the same system to provide redundant reporting.

The K3852 Transceiver uses the control channel of the Advanced Mobile Phone System (AMPS) cellular network to report subscriber alarms and system status messages. It operates on either the “A” or “B” side of the cellular network without using a voice channel. Because alarms are transmitted only on the control channel, a true “phone call” is never placed. This eliminates delays due to busy or saturated cells where no voice channels are available.

The K3852 is compliant with the MicroBurst standard for packet-based control channel cellular communication. Alarm and status packets are transmitted from the subscriber to a local cell where they are identified and then routed using SS7 to the AlarmNet Control Center. The AlarmNet Control Center then logs the alarm and routes it via RF to the appropriate AlarmNet-A or AlarmNet-M equipped central station.

System Features

Hardware Features

• Up to 6 input zones (when ECP is not used) that can be triggered by either applying or removing a

voltage.

• Zones 1 and 2 are configurable to trigger on the application of a voltage or ground.

• Zones 5 and 6 are configurable as voltage-tripped zones or as ECP IN / ECP OUT, respectively (the

installer must choose either zone inputs or ECP communication, not both).

• Radio fault relay Form A contacts, programmable.

• Auxiliary, general purpose relay, Form A contacts, controllable across the radio link.

• Trigger voltage for use with dry contact relays.

Section 1: General Information

LED Indications

• Received Signal Strength Indication (RSSI), displayed on a 5-position bar graph.

• Three radio status LEDS to indicate message status and radio status.

Antenna

• ADEMCO cellular antenna included (part number K3209).

Power

• Wall-mounted 16.5VAC / 40VA transformer ADEMCO PN: 1361 (1361CN for Canadian installations).

• Optional battery backup adds over 4 hours of additional system life during AC loss. ADEMCO PN:

7720BT

Programmable Features

• Subscriber, city and central station ID • Tamper zone

• Carrier selection • Old alarm time reporting period

• Supervision messaging period • AC loss reporting

• Time zone • Battery backup with optional battery

• Steady state or pulsed zones with delays • Radio fault relay

• Inverted zone trigger levels • Radio fault time

• Zone restoration messaging • Secondary CS reporting

• Open/Close reporting • Password assignment

• Telco fault zone

– 3 –

Section 2: Quick Start/Programming Guide

1. Unpack and initialize the radio.

a. Unpack the K3852 and install the antenna. b. Remove the unit’s lower cover (refer to Removing the Lower Cover section). c. Connect a fully charged battery (Ademco 7720BT) or a 40VA transformer (Ademco 1361 or 1361CN). d. Monitor the initial power-up LED sequence (refer to the Initial Power-Up Sequence section). This can

take several minutes.

2. Find coverage and select a site.

If this is the first K3852 to be installed in a given area, please verify that there is coverage in that ZIP code by either checking the coverage selection at the AlarmNet web site www.ademco.com/alarmnet, or by calling 1-800-222-6525 and asking our technical assistance group. a. Verify MicroBurst coverage using the radio status LEDs as shown at

right, or use the “B” command on the 7720P Programming Tool.

b. Select an installation site by observing the signal strength (RSSI) bar

graph or use the “B” command on the 7720P Programming Tool (refer to the Selecting a Radio Installation Site section for detailed procedure).

MicroBurst

3. Test the site.

a. Test the RF link between the K3852 and the local cell with a single

click test message (refer to the Testing section for details).

b. Test communication with the AlarmNet C network by double

clicking the tamper/test switch and receiving message validation. If desired, you can cancel validation by clicking the tamper switch once.

"click"

RSSI

G G G G

4. Program the radio.

a. Connect the 7720P Programming Tool, reset the radio by cycling the power off then on; press [Enter]

during the initial power-up sequence to enter Programming mode.

b. Program the K3852 as described in the Programming section. Refer to the programming defaults on the

next page.

5. Register the radio.

a. Send test registration with the 7720P “T” command to verify account and routing. b. Register the K3852 with AlarmNet by triple clicking the tamper switch and observing the LED displays

as shown below, or by pressing the [↑] key on the 7720P.

MSG 1

SENT

G G G G

"click"

MSG 2

SENT

G G G G

MSG 3

SENT

G G G G

WAIT

ACK

G G G G

REGISTRATION

registration

progress

RSSI

1.5 bars min

VALIDATION

6. Complete the installation.

a. Mount the radio (refer to the Mounting section). b. Wire to the Control (refer to the Wiring section) and test all signals. c. Test the installation (refer to the Testing section)

– 4 –

blink

off

LED Key

rapid blink

Quick Start/Programming Guide

K3852 Programming Defaults for Zone Mode

* Options 2, 3 and 4 must be programmed to complete Quick Start.

Programming Option Standard

Default Value

1 ECP Radio (Y/N) N A Software revision 2 ID Number * xxxx B Radio and connectivity display (network OK, no service, no 3 City Number * xx contact, signal strength, A or B carrier, MIN) 4 CS ID * xx C Network time display 5 Supervision 24 hours D Battery test (starts 10 minute battery test) 6 Time Zone Eastern E Network system display (channel, local carrier, SID) 7 Carrier Select Auto F Carrier display (A or B carrier, MicroBurst found, preferred

8 Device Address (ECP only) xx side indication) 9a Pulse Z1 (Y/N) N S Status display 9b Z1 Delay (00-127) 0 T Test signal/Test registration when unregistered

10a Pulse Z2 (Y/N) N X Reset 10b Z2 Delay (00-127) 0 11a Pulse Z3 (Y/N) N 11b Z3 Delay (00-127) 0 12a Pulse Z4 (Y/N) N 12b Z4 Delay (00-127) 0 13a Pulse Z5 (Y/N) N 13b Z5 Delay (00-127) 0 14a Pulse Z6 (Y/N) N 14b Z6Delay (00-127) 0

15 Invert Z1 (Y/N) N 16 Invert Z2 (Y/N) N 17 Invert Z3 (Y/N) N 18 Invert Z4 (Y/N) N 19 Invert Z5 (Y/N) N 20 Invert Z6 (Y/N) N 21 Restore Z1 (Y/N) N 22 Restore Z2 (Y/N) N 23 Restore Z3 (Y/N) N 24 Restore Z4 (Y/N) N 25 Restore Z5 (Y/N) N 26 Restore Z6 (Y/N) N 27 Arm/Disarm Z6 (Y/N) N

27a Enable Z1 on arm (Y/N) N 27b Enable Z2 on arm (Y/N) N 27c Enable Z3 on arm (Y/N) N 27d Enable Z4 on arm (Y/N) N 27e Enable Z5 on arm (Y/N) N

28 Open/Close Zone 0 29 Telco Channel 0 30 Tamper Zone 0 31 Old Alarm Time 10 minutes 32 AC Loss Report Y 33 Battery Present (Y/N) Y 34 Fault Relay On (Y/N) N 35 Fault Time (minutes) 5 36 2nd CS (Y/N) N 37 2CS Z1 (Y/N) N 38 2CS Z2 (Y/N) N 39 2CS Z3 (Y/N) N 40 2CS Z4 (Y/N) N 41 2CS Z5 (Y/N) N 42 2CS Z6 (Y/N) N 43 2CS Tamp (/N) N 44 2CS Sys Rpt (Y/N) N 45 2nd ID # xxxx 46 2nd City xx 47 2nd CS ID xx 48 Review? N 49 Enter Password? (Y/N) N

Actual

Entry

7720P Keyboard Commands

↑↑ Register radio (must be programmed) ↓↓ Replacement radio (must have PIN)

– 5 –

Section 3: Installation and Setup

Removing the Lower Cover

During normal operation, the lower cover of the K3852 should remain in place.

To remove the cover, gently press in on either of the two locking tabs and lift the cover.

Removing the cover will trigger the following two events:

1. A tamper zone alarm will be transmitted.

2. The RSSI bar graph, which is intended to be used as an

installation tool and troubleshooting aid, will become active.

Do not attempt to remove the upper cover. There are no user serviceable components

beneath this cover.

Refer to the following diagram to identify the components of the K3852.

Figure 1. K3852 with Cover Removed for Component Identification

– 6 –

K3852 Initial Power-Up Sequence

Before connecting power, check that the following have been completed:

q 16.5VAC / 40VA transformer connected to terminal block positions 1 & 2 q P2 in the correct position for zone 1 & 2 trigger levels (zone mode only) q P3 in the correct position for zone or ECP operation q Antenna installed

Apply power by plugging in the 16.5VAC / 40VA transformer. If using the optional battery, plug it into the battery jack. Initially, all K3852 programming options are set to the factory default settings.

Upon applying power, the K3852 enters the power-on reset mode, indicated by all 8 LEDs being solidly lit for approximately 5 seconds followed by the RSSI bar graph green LEDs lighting in a “chaser” sequence from left to right. After this power-up sequence, the Radio Status LEDs display solid green, blinking yellow, and solid red.

This indicates the K3852 is functioning but not yet initialized. The K3852 then begins its initialization sequence. During this process, the K3852 is verifying its Mobile Identification Number (MIN) and checking for MicroBurst service on both the “A” and “B” side carriers. This initialization is displayed on the RSSI bar graph as follows (refer to Table 1): The yellow LED will remain unlit and the green LED at the extreme right of the display will begin to blink. This green LED then lights solid (after a short period of time), and the next green LED to the left begins to blink. When this LED lights solid, the next green LED begins to blink, and so on, until all 4 green LEDs are lit solid. This countdown event may take up to 3 minutes to complete.

Once this sequence has been completed, the RSSI display begins to function as a signal strength indicator as described in Selecting a Radio Installation Site section. The radio is now in normal, unprogrammed and unregistered operation. If radio setup and self-test fails, LED 5 will blink continuously and no further progress will be made. If MicroBurst coverage is not found on either the A or the B side, the K3852 will repeat steps 2 and 3. These steps will be repeated until MicroBurst is found.

Table 1. K3852 Initial Power-Up Bar Graph and Radio Status LED Sequence

Active Function Bar Graph Display Radio Status Display

1) LED 5 blinking: K3852 performing radio setup and self-test. Time to complete: less than 1 minute.

NOTE: If the K3852 fails the self-test, the initial powerup will not progress beyond this point.

2) LED 4 blinking: K3852 searching for MicroBurst coverage from the B-side carrier. Time to complete: 1 – 3 minutes

3) LED 3 blinking: K3852 searching for MicroBurst coverage from the A-side carrier. Time to complete: 1 – 3 minutes

4) LED 2 on: K3852 initial powerup complete. Time to complete: 10 seconds

1 2 3 4 5 Y G G G G

4 on: B-side MicroBurst OK or 4 off: B-side MicroBurst fail.

3 on: A-side MicroBurst OK or 3 off: A-side MicroBurst fail.

5 on: radio set-up ok.

Green on: un-registered

Yellow blinking: waiting Red on: no MicroBurst coverage

Green on: un-registered radio Green blinking: service request message successful, B-side

Green off: previously registered radio

Yellow on: request for service message pending, B-side

Yellow blinking: B-side (once per second)

Red on: MicroBurst coverage not yet found, B-side

Red blinking: service request message un-successful, B-side Red off: MicroBurst coverage found, B-side

Green on: un-registered radio Green blinking: service request successful, A-side

Green off: previously registered radio Yellow on: request for service pending, A-side

Yellow blinking: A-side (twice per second)

Red on: MicroBurst coverage not yet found, A-side Red blinking: service request message un-successful, A-side Red off: MicroBurst coverage found, A-side

Green on: un-registered radio

Green off: previously registered radio

Yellow blinking: A-side or B-side blink indication

Red on: no MicroBurst coverage

Red off: MicroBurst coverage, carrier indicated by Yellow LED

– 7 –

LED Key:

rapid blink

blink

off

Selecting a Radio Installation Site

The K3852 is designed to be mounted on a vertical surface (wall), with the included antenna pointing up. When selecting mounting a site, maintain distances from various types of electrical equipment as listed in Table 2. Additionally, observe the maximum wire run lengths (see Table 4).

The K3852 is intended for indoor installation only. Mounting outdoors will cause system failure and may present a shock hazard.

1. Remove the cover and install a fully charged battery. If a fully charged battery is not available, you can

connect a 16.5VAC / 40VA transformer.

During battery operation, removal of the lower cover will significantly reduce the life of the charge on the battery. To get the maximum backup battery life in the event of an AC loss, the lower cover must be replaced when the installation is complete. (Note that the signal strength bar graph located below this cover is only needed during installation.)

2. Select a likely location by monitoring the signal strength bar graph. Refer to the Using an Unregistered

K3852 as an Installation Tool paragraph below. A strong signal lights more LEDs than a weak signal.

3. Find a location where the signal level is consistently better than 1-½ bars or –101dBm as measured

with the 7720P. The K3852 can function properly with the signal strength level as low as one-half bar (yellow blinking), but this may be an indication of marginal coverage.

Notes:

1. Optimum RF performance can usually be found at the highest point within a building, with the fewest number of walls between the radio and the outside of the premises.

2. Avoid mounting the antenna near other electronic devices. Table 2 provides minimum distances. Highest RF energy is in the direct, horizontal line of the antenna. Therefore, vertical separation (moving electronic devices either higher or lower on the wall) provides a higher level of isolation from the radio.

Table 2. Minimum Distances From Electrical Equipment

Equipment Distance

PIR 10 ft. FM radio or TV ant. 25 ft. Other devices 10 ft. minimum

Using an Unregistered K3852 as an Installation Tool

An unregistered K3852 will display signal strength once the initial power-on sequence is complete.

Use the guide on the right when selecting an installation site. Select an installation site where the RSSI is between 1.5 – 5 bars.

Signal Strength Bar Graph Displays

0.0 no signal

0.5

1.0

1.5 min installation level

2.0

2.5

3.0

3.5

4.0

4.5

5.0 max signal

– 8 –

Testing the Installation

Using an Unregistered K3852 to Test the Installation

An unregistered K3852 can send three types of test messages: unvalidated, validated, and test registration. Refer to the table below.

Unvalidated Test Message

Use this to test the path from the K3852 to the cell.

SINGLE click the tamper switch to send a test message to the local cell. The RSSI bar graph displays how well the K3852 is receiving this cell. Read the RSSI display from left to right: If the yellow and the next two green LEDs are illuminated, the display is read as “three bars.” If the yellow and the next two green LEDs are lit solid with the following green LED flashing, the display is read as “three and a half bars.” This is a stronger received signal than the previous example. Refer to the Full Scale RSSI Display diagram on the previous page.

Radio status LEDs for a good test message transmission to local cell:

1 2 3 4

"click"

step

1. normal

2. message pending

3. Tx good

4. return to normal

Radio status LEDs for a failed test message transmission and a good retransmission to local cell:

2 3 4

1 5 6

"click"

step

1. normal

2. message pending

3. Tx fail

4. message pending

5. Tx good

6. return to normal

Validated Test Message

Use this to test the path from the K3852 to AlarmNet and back to the K3852.

Radio status LEDs for a good test message transmission to AlarmNet and validation:

DOUBLE click the tamper switch to send a test message to AlarmNet with a validation request. The yellow radio status LED blinks rapidly while waiting for validation. Validation is a low priority receipt from AlarmNet to the K3852 and may take several minutes to receive. If a message is not validated by AlarmNet within

1 2 3

"click"

step

1. normal

2. message pending

3. Tx good

4. waiting for validation

5. return to normal

90 seconds, the K3852 will retransmit the test message and wait for validation.

NOTE: When a good test message is sent from the K3852, it can be assumed with a high degree certainty that it reached AlarmNet without waiting for validation

To cancel any test message, SINGLE click the tamper switch.

LED Key:

rapid blink

blink

off

Test Registration

Use this to test the path from the K3852 to AlarmNet, then to the central station, and back to the K3852. This confirms the radio’s programming and routing across the AlarmNet network without actually registering it.

NOTE: Quick Start Programming Options 2, 3, and 4 must be programmed to use this feature. Use the “T” command on the 7720P to initiate test registration. Refer to section 5 for a detailed description

of this feature

– 9 –

Section 4: Programming the K3852

There are 3 methods of programming the K3852: (1) Using a 7720P Programming Tool; (2) using an ECP capable control panel that supports long range radio programming,; (3) using the Programmerless Registration Option (PRO).

To use the 7720P, connect the 7720P then power-up the radio. Refer to the description below. To use an ECP capable control, connect the control, then power-up the radio. Select ECP operation by

pressing the tamper switch once while the radio status LEDs are flashing in unison, which toggles the default configuration from zone mode to ECP mode. The unprogrammed K3852 flashes the radio status LEDs as follows during initial power-up:

ECP mode = twice per second Zone mode = once per second

The default device address of the radio is 3. Refer to the control’s instructions for programming procedures. To use the Programmerless Registration Option, power-up the radio, then contact AlarmNet Technical

Assistance Center (TAC). Refer to the Programmerless Registration Option Installation and Programming Guide insert.

Using a 7720P Programming Tool

The 7720P Programming Tool is powered by the K3852 via the Programming Jack. The K3852 will automatically sense the presence of the 7720P when it is plugged in.

Each key of the 7720P has two possible functions: a normal function and a SHIFT function. To perform a normal key function, simply press the desired key. To perform a SHIFT key function, press the SHIFT key, then press desired function key.

Table 3. 7720P Normal & Shift Key (shift LED lit) Functions

Key Normal Key Function SHIFT Key Function

BS/ESC [BS]: Press to delete entry [ESC]: Press to quit program mode; ↓/↑ [↓]: Scroll down programming [↑]: Scroll up programming

N/Y [N]: Press for "NO" answer [Y]: Press SHIFT-Y for "YES" answer SHIFT Press before pressing a SHIFT key function. Will light SHIFT LED. LED

goes out once a key is pressed. Press again for each SHIFT function desired. 1/A [1]: For entering the number 1 [A]: For entering letter A 2/B [2]: For entering the number 2 [B]: For entering letter B 3/C [3]: For entering the number 3 [C]: For entering letter C 4/D [4]: For entering the number 4 [D]: For entering letter D 5/E [5]: For entering the number 5 [E]: For entering letter E 6/F [6]: For entering the number 6 [F]: For entering letter F 7/S [7]: For entering the number 7 [S]: For entering letter S 8/T [8]: For entering the number 8 [T]: For entering letter T 9/X [9]: For entering the number 9 [X]: For entering letter X */SPACE [*]: For scrolling option list [SPACE]: For scrolling option list 0 [0]: For entering the number 0 No SHIFT function #/ENTER [#/ENTER]: Press to accept entries No SHIFT function

* Active only when the "REVIEW?" prompt is displayed.

After connecting the 7720P cable, power up the K3852 . The following will be displayed:

also can reset EEPROM defaults*

K3852 x.xx

x.xx = current software revision level NOTE: This document applies to software Rev. 1.20 or higher At this prompt during initial power-up, you may proceed with programming the K3852. Programming is

accomplished by answering displayed questions. Most questions require only a [Y]es or [N]o response, while others require a numerical response (ID numbers, etc.). Press ENTER to accept each response and proceed to the next question. A "?" indicates an invalid entry. The current value is displayed on the second line in parentheses ( ). To accept the current entry, simply press the ENTER key. If the current value is an invalid entry, pressing the enter key will cause the display to repeat the unanswered question; the next question will not be displayed until a valid answer is entered. Use the UP/DOWN arrow keys to scroll through the programming questions without changing any values. The ESC key will bring the list of questions to the end.

– 10 –

Enter programming mode by pressing [ENTER] during the initial power-up period after the chaser

sequence (while radio status LEDs are flashing consecutively or in unison). The K3852 reads its EEROM to determine its preprogrammed parameters. A CRC of the EEROM

locations is also read. If the computed CRC does not match the one read from EEROM, or if the programming parameters are invalid, the 7720P LCD displays "NO PROG" and the radio status LEDs flash in unison (after the initial chaser sequence). Otherwise, the LEDs flash consecutively.

Password Protection

If you are NOT programming the radio through an ECP capable control panel (e.g., VISTA-128FB), the programming menu can be password protected

Once a password is assigned, the following prompt appears upon entering programming mode:

ENTER PASSWORD:

See “Exiting Program Mode” paragraph later in this section for assigning and changing passwords.

Subscriber Information (Questions 1-7)

Question 1*.

Question 2.

ECP Radio(Y/N)

ID #

Press “Y” to enable ECP communication for alarm input (check that

jumper P3 is to right). Press “N” to enable voltage triggers for alarm input.

* This question will NOT appear if you are programming via the control

panel, since ECP mode is automatically required; Question 2 will be the first programming option displayed on the keypad. Enter the 4-digit customer account number, 0001-9999.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

City

CS ID

Supervision (24Hr.)

Time Zone (Eastern)

Carrier Select (Auto)

Enter the 2-digit primary city code, 01-99 (decimal).

Enter the primary central station's system ID number, 01-FE. This selection sets the supervision timing for the K3852 for either 24

hour or weekly. The default supervision timing is 24 hours. The K3852 sends a supervision message once during the supervision period. AlarmNet transmits a communications failure alarm to the central station if the supervision message is not heard within the period. Use the Space key to select weekly or 24 hour supervision. Must be set to 24 hr for UL installations. Use the [*] key to select the time zone in which the K3852 is being installed: Eastern, Central, Mountain, Pacific, or Atlantic.

Use the [*] key to choose the method by which the K3852 will select its cellular carrier: “A” or “B” side.

Auto: K3852 selects the carrier to which it will connect. In this mode,

the K3852 will automatically change its carrier side if coverage becomes degraded. NOTE: If the K3852 had been operating and competed its initialization sequence with this option set to “auto,” one of the following prompts will appear: Auto B then A: shows that the B-side carrier was initially selected. Auto A then B: shows that the A-side carrier was initially selected. These prompts are displays only, not programming choices, and the prompt will disappear if the [*] key is pressed.

A then B: K3852 prefers connecting to the “A” side carrier rather than the

“B” side carrier. If coverage is lost on the A side, the radio will switch to the “B” side carrier.

B then A: K3852 prefers connecting to the “B” side carrier rather than the

“A” side carrier. If coverage is lost on the B side, the radio will switch to the “A” side carrier.

A Only: K3852 searches for coverage on the “A” side only. Fixed carrier

operation.

B Only: K3852 searches for coverage on the “B” side only. Fixed carrier

operation.

– 11 –

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