Viking PI-1A Product Manual

PRODUCT MANUAL

Designed, Manufactured and Supported in the USA

COMMUNICATION & SECURITY SOLUTIONS

Interface Your Paging System with

Nearly Any Phone System!

Features

Viking’s Telecom Paging Interface allows you to
provide paging from nearly any phone system in­stead of from a microphone. You can also provide
background music and electronic night bell over
the audio system.

The PI-1A features a built-in voice activated (VOX)
or AC ring activated relay which provides D.P.D.T.
contacts for muting background music during pag­ing or to provide an electronic night bell. These
contacts are necessary when interfacing with sys­tems such as Panasonic, South Western Bell, In­tertel, etc., which do not provide a paging contact
closure.

In the event a paging port is not available, the PI-
1A can provide talk battery to allow connection of
the public address system to an unused line/trunk
input on the phone system.

The electronic night bell feature is activated by a
standard ringing analog PABX/KSU station circuit
or by a common audible contact closure provided
by an electronic key system. The ring pitch and vol­ume are adjustable allowing you to differentiate be­tween multiple ringing lines.

• Floating 600 ohm output

• Selectable 22V DC talk battery for interfacing
with unused phone system line input/trunk
ports

• Paging port interface

• Ringing analog line input for night bell

• Contact closure input for night bell

• DPDT normally open and normally closed VOX
activated contacts for cutting out background
music

• Adjustable VOX contact time-out

• Adjustable VOX trigger sensitivity

• Adjustable ring volume

• Adjustable ring pitch

• Wall mount housing: (2) #6x3/4 panhead screws
included

• Integrate your public address system with
nearly any phone system

• Cut out background music during paging

• Electronic night bell from ringing line or
contact closure

Note: The PI-1A is not compatible with ring trip paging
applications. See Viking models FXI-1 (DOD# 494),
PA-15 (DOD# 486), or RAD-1A (DOD# 410).

Power: 120V AC/12V DC 500mA, UL listed adapter pro­vided
Dimensions: 111mm x 76mm x 36mm (4.38” x 2.97” x

1.38”)

Shipping Weight: .48 kg (1.06 lbs)
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to

95% non-condensing humidity
Relay Contacts: 30V DC@1A, 110V DC@0.3A, 125V AC
@ 0.5A
Maximum Ring Output: 0.5V AC RMS no load, 0.4V AC
RMS @ 600 ohms
VOX Minimum Audio Signal to Activate Relay: At 1KHz
with VOX sensitivity POT set to minimum: -17dbm, with
POT set to maximum: -37dbm

VOX Time Out Delay: 0.9 sec min / 4.3 sec max
Talk Battery: 22V DC

PI-1A

Telecom Paging

Interface

July 11, 2013

Applications

Specifications

www.vikingelectronics.com

Information: [phone]

VIKING

Installation and Programming

IMPORTANT: Electronic devices are susceptible to lightning and power station electrical surges from both the AC
outlet and the telephone line. It is recommended that a surge protector be installed to protect against such surges.

Step 1. Move the Talk Battery Switch to the PP position.

Step 2. Connect terminals 1 & 2 to the paging port.

Step 3. Connect terminals 3 & 4 to a line level input on your amplifier.

2

1. Paging Port

A. Paging

Features Overview

V

V

Pin Description

12

Positive 12V: A regulated 12VDC output

provided to operated external relays or other
devices (use terminal 11 as common).

11

Ground: Used as the ground (common) for

terminals 10 and/or 12.

10

Night Ring Contact Closure Input:

Produces ringing over the paging system
when shorted to Ground (terminal 11).

9

Line in: A ringing line will produce ringing

over the paging system.

8

7 Normally closed relay contact

6 Common relay contact

5 Normally open relay contact

4

Audio Out: Floating 600 Ohm output, con-

nect to input of paging amplifier.

3

2

Audio In: Connect to a page port output or

an unused C.O. line input (trunk/FXO port).

1

Switch

Talk

Battery

For Use With:

PP OFF

Paging port
output of
PABX/ KSU

T ON

Unused Line/
Trunk input of
PABX/KSU

To Paging

Port

To Paging Amplifer

Input (600 Ohm)

4: Audio Out
3: Audio Out
2: Audio In
1: Audio In

Power Input: 12V DC

(adapter included)

VOX Time Out Delay: The voice activated contact closures,
terminal screws 1, 2, 3 (Aux Relay) and 5, 6, 7 (Primary
Relay) on the PI-1A, have an adjustable time out delay from

0.9 to 4.3 seconds.
VOX Trigger Sensitivity: Turn the pot to the left to

decrease and the right to increase VOX trigger sensitivity.

PP

Talk
Battery
Switch

Note: The VOX trigger sensitivity will probably not need to be adjusted unless the PI-1A is disconnecting in the middle of a
page (turn clockwise to increase sensitivity if this is the case) or the PI-1A is not disconnecting on periods of silence longer
than the VOX time out delay (turn counter clockwise to decrease sensitivity if this is the case).

OX Trigger Sensitivity: Turn the pot to the left to decrease

and the right to increase VOX trigger sensitivity.

OX Time Out Delay: The voice activated contact
closures, terminal screws 1, 2, 3 (Aux Relay) and 5,
6, 7 (Primary Relay) on the PI-1A, have an adjustable
time out delay from 0.9 to 4.3 seconds.

Auxiliary Relay

The auxiliary relay is a second set of

contacts that work in conjunction with the

primary relay, (terminal screws 5, 6, 7).

J1

3: Normally Closed
2: Common
1: Normally Open

PP

Talk Battery Switch

T

(2) #6x3/4 panhead
screws (included)

Power Input: 12V DC

(adapter included)

Ring Pitch Control: Turn the pot to the left to decrease
and the right to increase the ringing (warble) pitch.

Ring Volume Control: Turn the pot to the left to
decrease and the right to increase the ringing (warble)
volume. Minimum: 0mV RMS, maximum: 490mV RMS.