Viking lm-24s Service Manual

Telecommunication Peripheral Products

See at a Glance when Lines are Ringing

Technical Practice

or In-Use

LM-24S

Line Status Monitor

System

July 5, 2000

See at a Glance when

Lines are Ringing

or In-Use

LM-24M LM-24D

The LM-24S Line Status Monitor System is designed for professional and efficient call
processing at department answering positions, message centers and back-up
attendant stations. Each LM-24S Line Status Monitor System includes one LM-24D
Display and one LM-24M Scanner.

The LM-24S Line Status Monitor
System provides a visual status of up
to 24 lines or stations. If a line or
station is in use, the corresponding
LED will light steady, a ringing line or
station will show a flashing LED.

Even if a ringing phone is out of
hearing range, a common audible
tone calls the operator’s attention to
the visible display. The tone is
adjustable for convenient operation.

http://www.VikingElectronics.com

VIKING©

[e-mail]

Features Applications

• Non-volatile memory (no batteries required)

• Visual status for up to 24 analog lines or
stations (idle, in-use, ringing)

• Programmable ring indication on a per-line
basis

• Adjustable display viewing angle for desk or
wall mounting

• Displays require only a single pair of wires

• Powers up to (3) LM-24D or LM-12W displays

• User printable extension identification cards

• Adjustable audio volume

• Quick installation

• Includes both the display and the scanner

• One year limited warranty

• Ideal for areas where personal attention must be
given to every call

• Eliminates the additional cost of adding a PABX
console or key system

• Allows for full utilization of all call pickup
features

• Monitors the status of lines or stations

Sales...(715) 386 - 8861

Specifications

Power: 120V AC/13.8V AC 1.25A UL listed adapter provided
Dimensions: LM-24M - 187mm x 127mm x 45mm (7.37” x 5” x

1.75”), LM-24D - 184mm x 119mm x 38mm (7.25” x 4.7” x 1.5”)
Shipping Weight: LM-24M - .68 Kg (1.5 lbs), LM-24D - .59 Kg

(1.3 lbs)
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to 95% non­condensing humidity

Connections: (1) RJ21X connector, (1) RJ11 jack
Maximum Display Runs: (1) display: 244m (500 ft), (2) display:

122m (400 ft), (3) displays: 61m (200 ft)

Installation

LM-24M Scanner

1 2 3 4

Al A.

Joanne M.

Stacy R.

Rudy T.

Linda V.

VIKING

©

LM-24D
Display

Don S.

Karen W.

Tom S.

Marie W.

Rachel O.

Ken M

ike L.

Carol L.

Shelly B.

Dennis M.

Bill H.

Paul S.

Nichole S.

.

Greg Y.

Tim

R.

Red
Green

Yellow Black

Optional

Earth Ground

Connection

Paul M.

Gail M

.

Al H.

M

ick W

.

M

RESET

LINE STATUS MONITOR

COM

SCANNER

VIKING©

MODEL LM-24M

POWER DATA

SENS
ADJUST

VIKING ELECTRONICS, INC. HUDSON, WI 54016

RJ21X

EARTH

GND

120V AC

Earth

Ground

Loop or
ground start
C.O. lines or

analog

To extension

telephones

PABX/KSU

station ports

Typical Punch-Down Block

(not included)

A. Ground Connections

The earth grounding lug or yellow/black pair on the modular RJ14 jack of the LM-24M
scanner must be connected to the positive of the talk battery for proper reference.
Normally this is the earth ground on most C.O. lines or analog PABX/KSU stations. To
test, use a voltmeter with the positive probe connected to the earth ground and the
negative probe to the ring side of a phone line. Measurements should be about 50 volts
on-hook and 30 volts off-hook.

Lug

Stations

Line Pins Color

1T
1R

2T
2R

3T
3R

4T
4R

5T
5R

6T
6R

7T
7R

8T
8R

9T
9R

10T
10R

11T
11R

12T
12R

13T
13R

14T
14R

15T
15R

16T
16R

17T
17R

18T
18R

19T
19R

20T
20R

21T
21R

22T
22R

23T
23R

24T
24R

25T

25R

26

W/BL

1

BL/W

27

W/O

2

O/W

28

W/G

3

G/W

29

W/BN

4

BN/W

30

W/S

5

S/W

31

R/BL

6

BL/R

32

R/O

7

O/R

33

R/G

8

G/R

34

R/BN

9

BN/R

35

R/S

10

S/R

36

BK/BL

11

BL/BK

37

BK/O

12

O/BK

38

BK/G

13

G/BK

39

BK/BN

14

BN/BK

40

BK/S

15

S/BK

41

Y/BL

16

BL/Y

42

Y/O

17

O/Y

43

Y/GN

18

GN/Y

44

Y/BN

19

BN/Y

45

Y/S

20

S/Y

46

V/BL

21

BL/V

47

V/O

22

O/V

48

V/GN

23

GN/V

49

V/BN

24

BN/V

50

V/S

25

S/V

Receptionist’s Phone

B. Phone Line Connections

All connections to the RJ-21X are in parallel with the C.O. lines or analog PABX/KSU stations. Use the table (above
right) to make the connections to the RJ-21X connector on the LM-24M scanner.

Note: The LM-24M scanner is factory set to 48 volts for C.O. lines or analog PABX/KSU stations. The LM-24M is
not sensitive to the polarity of the C.O. lines connected to the RJ-21X.

C. Display Connections

Communication from the LM-24S scanner is accomplished over a single pair to the LM-24D display. The LM-24D
display receives data through pins 3 (red) and 4 (green) of a modular 6-wire jack or pins 2 (red) and 3 (green) of a
modular 4-wire jack.

Note: The LM-24D is sensitive to the polarity of this communication pair. The LM-24D will not be damaged by
reversed polarity on this pair but it will not function properly!

D. Multiple Displays

The LM-24M can power up to (3) displays. If you need to power more than (3) displays or for long runs between the
scanner and display, an optional PS-2 power supply must be used with each LM-24D display. Adding PS-2 power
supplies will efficiently double maximum run distances.

E. Station Identification Cards

After filling out the station identification
card, insert in onto the display, followed
by the plastic cover, as shown in the
diagram to the right.

Plastic Cover

Don S.

Karen W.

Al A.

Joanne M.

Marie W.

Rachel O.

Paul M.

Rudy T.

Linda V.

Stacy R.

Carol L.

Gail M

.

Shelly B.

Al H.

M

Ken M

ick W

.

.

M

ike L.

Identification

Card

Tom S.

Tim

Nichole S.

Greg Y.

R.

Paul S.

Dennis M.

Bill H.

VIKING

©

Display

Programming

A. Accessing the Programming Mode

In order to program, you must first connect a C.O. line or analog PABX/KSU station port in parallel to the attendant
port (pins 25 and 50 - V/S and S/V). A telephone or test set must also be connected to the same pair. The
following programming must be done from this Touch Tone phone.

B. Programming the LM-24M

To begin programming, pick up the attendant’s phone (pins 25 and 50 - V/S and S/V). Enter ✱✱ or ## depending
on which character is accepted by your phone system. The display will flash twice and remain off, to indicate the
programming mode has been entered. The programming mode is exited when a valid or invalid program is
entered, or when the phone is returned to the on-hook position.

Line Number Delimiter Line Number Ring Delay

To disable display for one line only.............................

To disable displays for multiple lines...........................

To set a ring delay for one line only............................

To set a ring delay for for multiple lines.......................

Line number
Line number
Line number
Line number

✱ or #

✱ or #

Line number

Line number

0
0
(1 - 7)
(1 - 7)

Note: The LM-24D will flash the corresponding ring delay and then remain on. Programming is exited at this point

and the unit returns to the run mode. If an invalid program is entered, the LM-24D will sound an audible alert tone
and the current programming sequence will be canceled. On first time power up, all lines are enabled with a ring
delay of one. Once programmed, the ring delays are set from non-volatile memory.

C. Programming Examples

1. Pick up the attendant’s phone (pins 25 and 50 - V/S and S/V) and enter ✱✱ or ## to enter programming mode.

2. Complete the following examples...

Programming the LM-24M to....

...disable line 5
...disable lines 2 through 10
...set a ring delay of 6 for line 8
...set a ring delay of 3 for lines 12 through 20

D. Resetting the Ring Delays

1. Set dip switches as shown to the right.

2. Press the RESET button.

3. Turn switch 2 OFF.

4. Press the RESET button.

5. All ring delays will be set to one.

Enter ...
05 0
02 ✱ or # 10 0
08 6
12 ✱ or # 20 3

1 2 3 4

ON

OFF

Note: Setting a ring delay to “0”

disables a line. To enable a line,
set the ring delay to 1 - 7.

1 2 3 4

RESET

COM

SENS
ADJUST

LINE STATUS MONITOR

SCANNER

VIKING©

MODEL LM-24M

POWER DATA

RJ21X

VIKING ELECTRONICS, INC. HUDSON, WI 54016

EARTH

GND

E. Non-Connected Lines

All open or non-connected positions (lines) on the LM-24M must be disabled through user programming or they will
cause steady indication on the LM-24D display for their respective positions at all times.

The LM-24M scanner is shipped with all lines enabled. To disable (or not light) any of the 24 lines, some
programming is necessary as explained in section B above.

F. Trouble Shooting

Note: In order to attempt diagnostics tests 1 or 3, a C.O. line or analog station port must be connected to the

attendant port (pins 25 and 50 - V/S and S/V), as described above to access programming. Diagnostic test 2 does
not require any connections to the RJ-21X.

1 2 3 4

1. Touch Tone Diagnostics

a. Set dip switches as shown to the right.
b. Press the RESET button.
c. From the attendant’s phone, dial a Touch

1 2 3 4

ON

OFF

Tone 1.
d. The first LED on the LM-24D display should light.
e. From the attendant’s phone, dial a Touch Tone 2.
f. The second LED on the LM-24D display should light, etc.

Note: A ✱ on the attendant’s phone is LED 11 on the LM-24D and # on the attendant’s phone is LED 12.

2. LED, Ring, and Communication Diagnostics

a. Set dip switches as shown at the right.
b. Press the RESET button.
c. The display should begin lighting each LED

on the display in consecutive order.

1 2 3 4

ON

OFF

d. Once all LED’s are on, the display will turn

each LED off in consecutive order. Ringing
should also be heard.

Note: The volume is adjustable.

RESET

SENS
ADJUST

LINE STATUS MONITOR

COM

SCANNER

VIKING©

MODEL LM-24M

POWER DATA

1 2 3 4

RESET

LINE STATUS MONITOR

COM

SCANNER

VIKING©

MODEL LM-24M

POWER DATA

VIKING ELECTRONICS, INC. HUDSON, WI 54016

SENS
ADJUST

VIKING ELECTRONICS, INC. HUDSON, WI 54016

RJ21X

RJ21X

EARTH

GND

EARTH

GND

3. Checking the Sensitivity of the LM-24M

a. Set dip switches as shown at the right.
b. Press the RESET button.
c. Go off-hook on the attendant’s phone.
d. The “Data” LED on the scanner should produce a

steady light while off-hook and go off completely

1 2 3 4

ON

OFF

1 2 3 4

RESET

COM

SENS
ADJUST

LINE STATUS MONITOR

SCANNER

VIKING©

MODEL LM-24M

POWER DATA

RJ21X

EARTH

VIKING ELECTRONICS, INC. HUDSON, WI 54016

GND

when hung-up.

Operation

The LM-24S system consists of two modules: the LM-24D display which is located at the answering position and the
LM-24M scanner which is located in the telephone equipment room. Up to three LM-24D displays may be connected to

one LM-24M scanner without optional PS-2 power supplies. The communications link between the display and the
scanner is a single pair of telephone wires. The scanner connects to all station ports that are to be monitored.

The LM-24S provides a visual “idle and “in-use” LED as well as visual and audible ring indication for up to 24 C.O. lines
or analog PABX/KSU station ports. The system helps to eliminate confusion by providing a programmable ring
indication on a per-line basis. The LM-24S is designed to be used at department answering positions, message centers
or any system with directed call pickup, call forward on busy/no answer and for back up attendants.

The LM-24S scans all station circuits providing real time updated information for the attendants.

Product Support Line...[phone] Fax Back Line...[phone]

Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking
Electronics, its affiliates and/or subsidiaries assume no responsibility for errors and/or omissions contained in this information. Revisions of
this document or new editions of it may be issued to incorporate such changes.

Printed in the U.S.A. ZF290030 Rev DFax Back Doc # 670