Monroe Electronics 948A User Manual

Model 948A/AX

Cue Tone Receiver

INSTRUCTION MANUAL

Monroe Electronics

100 Housel Ave  Lyndonville  NY 14098

800-821-6001  585-765-2254  fax [phone]

monroe-electronics.com

Printed in USA  Copyright  Monroe Electronics, Inc.

Specifications subject to change without notice

P/N 1340177

9/29/04

TABLE OF CONTENTS

WARRANTY -----------------------------------------------------------------------------------------2
RETURN POLICY-----------------------------------------------------------------------------------2
GENERAL DESCRIPTION ----------------------------------------------------------------------3
INSTALLATION -------------------------------------------------------------------------------------4
OPERATION -----------------------------------------------------------------------------------------6
3185E INSTRUCTION MANUAL ---------------------------------------------------------------8

DESCRIPTION ---------------------------------------------------------------------------------9
SPECIFICATIONS --------------------------------------------------------------------------10
INSTALLATION ------------------------------------------------------------------------------11

Mounting --------------------------------------------------------------------------------- 11
Pin Numbers and Functions -------------------------------------------------------- 11
FIGURE 1 - Edge Connector, Switch and Indicator Locations -----------12
FIGURE 2 - Block Diagram ---------------------------------------------------------12
Audio Input Connection --------------------------------------------------------------13
‘Set’ Input Connection ----------------------------------------------------------------13
‘Reset’ Input Connection-------------------------------------------------------------13
Relay Output Connection -----------------------------------------------------------13
Power Supply Input -------------------------------------------------------------------13

CUSTOMER OPTIONS --------------------------------------------------------------------14

FIGURE 3 - Jumper Locations -----------------------------------------------------15
Input Impedance -----------------------------------------------------------------------15
Input Balanced/Unbalanced --------------------------------------------------------16
5 Minute Restoral ---------------------------------------------------------------------- 16
20 Minute Reset ---------------------------------------------------------------------- 16
Output Relay --------------------------------------------------------------------------- 16
10 Second Pulse -----------------------------------------------------------------------16
Number of Digits to Decode ------------------------------------------------------- 17

Fourth Digit ON/OFF ---------------------------------------------------------------- 17
CODE SELECTION -------------------------------------------------------------------------18
OPERATION ----------------------------------------------------------------------------------18

Operating With a 4-Digit Code --------------------------------------------------------- 18
Operating With a 3-Digit Code --------------------------------------------------------- 19
Operating With a 2-Digit Code --------------------------------------------------------- 19
Operating With a 1-Digit Code --------------------------------------------------------- 19

ADJUSTMENT ------------------------------------------------------------------------------- 19

1

WARRANTY

Monroe Electronics, Inc. warrants to the owners, each instrument and sub-assembly
manufactured by them to be free from defects in material and workmanship for a period of one
year after shipment from factory. This warranty is applicable to the original purchaser only.

Liability under this warranty is limited to service, adjustment or replacement of defective parts
(other than fuses or batteries) on any instrument or sub-assembly returned to the factory for this
purpose, transportation charges prepaid.

This warranty does not apply to instruments or sub-assemblies subjected to abuse, abnormal
operating conditions, or unauthorized repair or modification.

Since Monroe Electronics, Inc. has no control over conditions of use, no warranty is made, or
implied as to the suitability of our product for the customer's intended use.

THE WARRANTY SET FORTH IN THIS ARTICLE IS EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES AND REPRESENTATIONS, EXPRESS, IMPLIED OR STATUTORY
INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. Except for obligations expressly undertaken by Monroe Electronics, in this
warranty, Owner hereby waives and releases all rights, claims and remedies with respect to any
and all warranties, express, implied or statutory (including without limitation, the implied
warranties of merchantability and fitness), and including but without being limited to any
obligation of Monroe Electronics with respect to incidental or consequential damages, or
damages for loss of use. No agreement or understanding varying or extending the warranty will
be binding upon Monroe Electronics unless in writing signed by a duly authorized representative
of Monroe Electronics.

In the event of a breach of the foregoing warranty, the liability of Monroe Electronics shall be
limited to repairing or replacing the non-conforming goods and/or defective work, and in
accordance with the foregoing, Monroe Electronics shall not be liable for any other damages,
either direct or consequential.

RETURN TO FACTORY POLICY:

Materials returned to Monroe must have a Return Material Authorization number. To obtain a
RMA number, contact our A/V Switching & Control Customer Service at 585-765-2254 or fax
585-765-9330. Customers have 30 days to determine that the product ordered fills their need
and performs as described in Monroe’s literature. Units returned for approved repair or credit,
must be in the original packaging including all parts and paperwork plus be in very good
physical condition. If not, the customer is billed the cost to refurbish the unit and for missing
accessories and merchandise. No products may be returned for exchange or credit after 12
months of the shipment date. Monroe reserves the right to repair or replace units under
warranty.

2

GENERAL DESCRIPTION

The Model 948A/AX Cue Tone Receiver is a small wall mounted enclosure containing
2 or 3 PC boards, in plus a power unit. The Model 948A contains a Model 3137B
UAD, a Model 3185E Dual Tone Decoder, a Model 3446A Stereo Audio/Video Switch,
with a, wall mounted power supply. The Model 948AX contains all the above parts,
EXCEPT the Model 3137B UAD.

The units are designed to switch a Stereo Audio-follow-Video or IF/RF signal if the
proper DTMF tone sequence is entered. These signals may be received from various
audio sources, including sattelite audio or microwaves. The Model 948A may also be
controlled via a dial up telephone line.

3

INSTALLATION

1. Remove the two screws holding the cover on the 948A and remove the cover.

2. The Model 3185E is factory set to decode a 4-digit ‘ON’ code sequence and a 4­digit ‘OFF’ code sequence. The first three digits in the code sequence are
determined by the hexadecimal rotary switches on the front edge of the 3185E. 0
through D select the corresponding DTMF digit to be decoded. The letter ‘E’ on the
rotary switch represents the ‘*’ DTMF digit and the letter ‘F’ on the rotary switch
represents the ‘#’ DTMF digit. The fourth digit for the ‘ON’ code sequence is factory
set to ‘*’, and fourth digit for the ‘OFF’ code sequence is set to ‘#’. Set the rotary
switches on the 3185E to the Cue Tone sequence you wish to decode. See the
3185E manual for more information.

3. The Cue Tones may be received by the Model 948A from the alternate program
source (baseband audio) or other audio subcarriers. If so, connect an audio cable
from the Cue Tone source to TB1 #4 with common on TB1 #5 (ground). If installing
a 948AX, connect Cue Tone Audio to TB2 #8 and TB1 #5 (ground).

4. Connect the video from the main program source to the normally closed (NC) F
connector on the 3446A card.

5. Connect the video from the alternate program source to the normally open (NO) F
connector on the 3446A.

6. Connect the modulator video input to the common (COM) F connector on the
3446A card.

7. Connect the Left and Right Audio inputs, and the Audio output, to the screw
terminals on the mother board as shown in the accompanying schematic.

8. Connect the White (+12) lead from the power supply to TB1 #7 and the Black
(GND) lead from the power supply to TB1 #6.

9. If your model is a 948A, the audio tones may be supplied over the telephone line
and/or from an audio source as described above. If the signals come ONLY over
the telephone line, disregard item 3 above.

10. Attach the Tip and Ring lines from the POTS line to the connections as shown on
the attached drawing.

11. The 3137B is set to answer on 2 rings, and hang up on current disconnect when
the calling party hangs up. See the 3137B manual for more information.

4

Open

Video Switch PC Board

Normally Common Normally
Closed

5

OPERATION

The Model 3185E Dual Tone decoder monitors the audio at TB #1 pin 4 for the
specific four digit Cue Tone ‘ON’ code sequence to which it is programmed to respond.
When it receives the correct code, the 3185E’s relay energizes, which supplies ground
to the 3446A Relay card, energizing it’s relays. This switches in the alternate
audio/video program source.

The 3185E continues to monitor the audio at TB1 #4 and when it receives the correct
‘OFF’ code sequence, it de-energizes it’s relay and de-energizes the relays on the
3446A card. This returns it back to the main program source.

If the Model 3137B UAD has answered the telephone line, the above connection is
isolated, and tones supplied over the telephone line are used – as above – to activate
the device.

6

7

Model 3185E

DUAL TONE DECODER

INSTRUCTION MANUAL

Monroe Electronics

100 Housel Ave  Lyndonville  NY 14098

800-821-6001  585-765-2254  fax [phone]

monroe-electronics.com

Printed in USA  Copyright  Monroe Electronics, Inc.

Specifications subject to change without notice

P/N 1340163

090104

8

DESCRIPTION

The Model 3185E Dual Tone Decoder is capable of accepting a sequence of up to four dual
tone signal inputs such as those from a Touch-Tone® telephone keypad. It provides a relay
closure as its output. Standard features include:

• Dual Form C Relay Output

• Selectable Input Impedance

• Selectable Balanced/Unbalanced Input

• Adjustable Input Signal Range

• Restoral of Output Status if Power Interruption is Less Than 5 Minutes.

• Selectable 20 Minute Relay Output Reset

• Digit Sequence Selectable up to Four Digits

• Selectable Relay Output Action (latching, momentary, or alternate).

• Level Sensitive 'Reset' Input

• Level Sensitive 'Set' Input

9

SPECIFICATIONS

Input Coupling -------------------------------------------------AC
Input Impedance:

Factory Setting --------------------------------------10 kΩ Minimum
Selectable --------------------------------------------600 Ω Terminated

Input:

Factory Setting --------------------------------------Unbalanced

Selectable --------------------------------------------Balanced
Common Mode Range --------------------------------------± 5 Volts
Input Signal Range:

Minimum ----------------------------------------------50 mV p-p

Maximum ---------------------------------------------1.5 V p-p
Input Range:

Nominal -----------------------------------------------−14 dBm to −4 dBm

(155mV to 489)mV

Optional -----------------------------------------------±10 dBm Adjustable
Digit Validation Time ----------------------------------------40 ms Minimum
Inter-Digit Time:

Minimum ----------------------------------------------40 ms

Maximum ---------------------------------------------3 Seconds
Maximum Digits Per Second:

No Twist -----------------------------------------------13

±6 dB ---------------------------------------------------12
Relay Output ---------------------------------------------------DPDT 30 VDC @ 2 Amp.
‘Reset’ Line -----------------------------------------------------Level Sensitive

Minimum 20 ms Pulse
to Ground.

‘Set’ Line --------------------------------------------------------Level Sensitive

Minimum 20 ms Pulse
to Ground.

Edge Connector ----------------------------------------------Monroe Model 3000RK

(Cinch Jones 50-20A-30)

Power Requirements ----------------------------------------12 Volts D.C. ±10%

40 mA Maximum.

Physical Dimensions ----------------------------------------5.0 in.H x 3.0 in.W x 0.6 in.D

10

INSTALLATION

Mounting:

The Model 3185E is designed to plug into a Monroe 3000RK 20-pin edge connector. All
connections are intended to be made at the edge connector and will be referred to in this
manual by edge connector number or letter.

Pin Numbers and Functions:

Pin numbers are listed below for the Model 3185E when plugged into a 3000RK Connector.
Consult FIGURE 1 on page 4 for proper registration of pin numbers.

PIN NUMBER FUNCTION

1 Common terminal for relay output referenced to pins 9 and 10.
2 Circuit common (ground).
3 Circuit common (ground).
5 Audio input low (audio input circuit common if unbalanced).
6 Audio input high.
8 +12 Volt D.C. power supply input.

9 Normally closed contact for relay output referenced to pins 1

and 10.

10 Normally open contact for relay output referenced to pins 1 and

9.
A Common terminal for relay output referenced to pins K and L.
B Reserved. Connections to this pin will disable card.
D ‘Set’ input.
E ‘Reset’ input.
K Normally closed contact for relay output referenced to pins A

and L.

L Normally open contact for relay output referenced to pins A and

K.

11

Relay Output
Pwr./Valid Digit

10

L
K

9

J

8
7

H
F

6
5

E

4

D

3

C

2

B
A

1

Valid Sequence

Digit 4

OFF

Digit 4

ON

Digit 3

Digit 2

Digit 1

Circuit Side
3000RK Connector Kit
Component Side

FIGURE 1

Edge Connector, Switch and Indicator Locations

FIGURE 2

Block Diagram

12

Audio Input Connection:

The audio input is connected at pins '6' and '5' (circuit common). The 3185E is factory set at
10 kΩ input impedance; unbalanced. This audio input may be changed by the customer to
have a 600 Ω termination instead of 10 kΩ, and also to be balanced instead of unbalanced.
Consult the CUSTOMER OPTION section for more explanation.

‘Set’ Input Connection:

The ‘Set’ input is connected at pin 'D', and when pulsed to circuit common will energize the
output relay. The output relay will remain energized until the proper 'OFF' code is received or
the ‘Reset’ input is pulsed to ground. This input is level sensitive and requires a minimum
pulse width of 20 msec. to circuit common to activate or de-activate the output relay. The ‘Set’
input has precedence over all functions except ‘Reset’.

If the 3185E's ‘Set’ input is pulsed to circuit common while decoding a code sequence it will
clear previous valid digit(s) decoded after the ‘Set’ input returns to a ‘high’ state.

‘Reset’ Input Connection:

Momentarily connecting pin 'E' to circuit common will cause the 3185E to reset. This input is
level sensitive and requires a minimum pulse of 20 msec. to circuit common to reset the card.
The ‘Reset’ input dominates over all other functions.

NOTE: The 3185E will ignore all commands or code sequences until the ‘Reset’ input is
removed from circuit common.

Relay Output Connections:

The 3185E provides a dual Form C relay output. The output relay will energize whenever the
preprogrammed 'ON' code sequence is received or the ‘Set’ input is momentarily connected to
circuit common. If the output relay is set to ‘momentary’, the output relay will activate
approximately 40ms after the last valid digit is received and stay on as long as the last valid
digit is present. If the output relay is set to ‘latching’, the output relay will remain energized
until the programmed ‘OFF’ code sequence is received or the ‘Reset’ input is momentarily
connected to circuit common.

The dual Form C relay output connections are shown below:

RELAY OUTPUT

1 FORM C 1 9 10

1 FORM C A K L

COMMON

CONTACT

NORMALLY

CLOSED

CONTACT

NORMALLY

OPEN

CONTACT

TABLE 1

Power Supply Input:

The power supply input is connected to pins '8' (+12 VDC) and '3' (circuit common). The
3185E requires a power supply capable of providing 50mA minimum, and regulation of the
+12 volt, ±10 %.

13

CUSTOMER OPTIONS

The Model 3185E is factory set to the following:

• Input Impedance:------ 10 kΩ

• Input:---------------------- Unbalanced

• 5 Minute Restoral:----- Enabled

• 20 minute Reset:------ Disabled

• Output Relay:----------- Latching

• 4 Digit Decode Sequence

• * for Fourth Digit 'ON'

• # for Fourth Digit 'OFF

Jumpers are used to modify these options. See FIGURE 3.

14

NUMBER OF DIGITS J6 J5 RELAY OUTPUT MODE J3 J4

1
2
3
4

X X

X O
O X
O O

LATCHING

MOMENTARY

ALTERNATE

20 MINUTE LATCH

O O

X O

O X

X X

X = JUMPER INSTALLED
O = JUMPER REMOVED

R12 = INPUT SIGNAL LEVEL RANGE ADJUSTMENT

JUMPER

INPUT IMPEDANCE

INPUT TERMINATION

5 MINUTE RESTORAL

20 MINUTE RESET

J2
J1 BALANCED UNBALANCED

J7 ENABLEDn DISABLED

J3, J4 DISABLEDn

OPEN SHORTED

10kΩn 600Ω

ENABLED

n

= FACTORY SETTING

n

FIGURE 3

Jumper Locations

Input Impedance:

Input impedance may be either 10 kΩ or 600 Ω. The J2 jumper determines the input
impedance of the 3185E. Install a jumper at position J2 to terminate the audio input in 600 Ω.
Consult FIGURE 3 for the J2 jumper location.

15

Input Balanced/Unbalanced:

The input may be selected to be balanced or unbalanced. The J1 jumper determines whether
the input is balanced or unbalanced. Removing the short from J1 will make the input
balanced. Consult FIGURE 3 for the J1 jumper location.

5 Minute Restoral:
The 3185E may be selected to restore the output status for a power interruption of less than

five minutes. The 3185E is factory set to enable this restoral. The J7 jumper is open. To
disable the five minute restoral install a jumper on J7. Consult FIGURE 3 for J7 location.

20 Minute Reset:

A 20-minute reset is provided to reset the output relay 20 minutes after the 'ON' code was
received or the ‘Set’ input was momentarily connected to circuit common. This option is
factory set disabled. To enable the option install jumpers on J3 and J4. Consult FIGURE 3
page 7 for the locations of J3 and J4.

Output Relay:

The output relay on the 3185E may be set in three different modes of operation; latching,
momentary or alternate action (toggling). The 3185E is factory set to latching.

Being set at latching means the output relay will energize when the pre-programmed 'ON'
code is received or the ‘Set’ input is momentarily connected to circuit common. The output
relay will remain energized until the preprogrammed 'OFF' code is received or the ‘Reset’
input is momentarily connected to circuit common.

When the output relay is programmed to operate in the momentary mode, it will energize for
the duration that the last valid digit is present. In the momentary mode the 3185E will not
respond to its pre-programmed 'OFF' code.

Alternate action programs the relay for latching (toggling) relay output. In this mode the output
relay energizes and de-energizes with the same pre-programmed 'ON' code sequence.

10 Second Pulse:

If both ‘Set’ and ‘Reset’ are low and the relay mode is ‘momentary’, then when a valid ‘ON’
sequence of digits is received, the relay is turned on for 10 seconds then ‘OFF’ – even if the
last tone is still present. The decoder will ignore all tones and ‘Set’ and ‘Reset’ activities
during the 10-second period. Applies only to firmware version 80154-1.10 and later.

16

The programming of jumpers for the output relay is shown below. Consult FIGURE 3 page 7
for the 'J3' jumper and the 'J4' jumper location.

RELAY OUTPUT JUMPER

MODE J3 J4

LATCHING O O

MOMENTARY X O

ALTERNATE O X

20 MINUTE RESET X X

TABLE 2

X = JUMPER INSTALLED

O = JUMPER REMOVED

Number of Digits to Decode:

The 3185E is factory set to decode a 4-digit 'ON' code sequence and a 4-digit 'OFF' code
sequence. The first three digits of the code sequence are the same for both 'ON' and 'OFF'.
The fourth digit for the 'ON' code sequence is factory set to '*', and the fourth digit for the
'OFF' code sequence is factory set to '#'. The number of digits to decode is determined by
jumpers 'J6' and 'J5'. Consult FIGURE 3 page 7 for the location of 'J6' and 'J5'.

The programming of jumpers for the number of digits to decode is shown below:

NUMBER OF JUMPER

DIGITS J6 J5

1 X X
2 X O
3 O X
4 O O

TABLE 3

X = JUMPER INSTALLED

O = JUMPER REMOVED

Fourth Digit ON/OFF:

The fourth digit of the 'ON' code sequence and the fourth digit of the 'OFF' code sequence
are factory set at '*' and '#' respectively. To enable user selection of the fourth digits, it is
necessary to remove resistor ‘R8” and install two additional selection switches, S4 and S5,
plus IC A3. When ordering the switches, please use Monroe Electronics part number
‘9200002’ for each of the two switches and part number ‘9120375’ for the IC required.

Consult the PC board layout (3185E/22) for the location of the parts to be removed and
inserted.

17

CODE SELECTION

The hexadecimal rotary switches on the front edge of the 3185E determine each digit in the
code sequence. 0 through D select the corresponding DTMF digit to be decoded. The letter
'E' on the rotary switch represents the '*' DTMF digit and the letter 'F' on the rotary switch
represents the '#' DTMF digit.

As stated before, the 3185E is factory set to decode a 4-digit 'ON' code sequence and a 4­digit 'OFF' code sequence. The first three digits of the code sequence are the same for 'ON'
and 'OFF' commands. The fourth digit for the 'ON' code sequence is factory set to '*', and the
fourth digit for the 'OFF' code sequence is factory set to '#'.

It is not necessary to power down the 3185E when you are programming the code sequence.
The 3185E program will read the switch settings each time a code sequence is received.

Consult FIGURE 1 on page 4 for location of switches and their designations.

OPERATION

When the 3185E is connected to a DC power source, the Power/Valid Digit LED CR14 on the
front edge of the PC board will be illuminated. This LED indicator will continue to illuminate
until a valid DTMF digit is detected or DC power is removed from the board.

The Valid Sequence LED CR15 will illuminate upon the decoding of a correct DTMF code
tone pair in the proper sequence. Upon the fourth correct digit, the output relay activates and
the Relay Output LED CR13 illuminates.

During the reception of valid DTMF tone pairs in a sequence the 3185E will — after decoding
a valid code number — wait for the next valid code in the sequence. If the time between
digits is more than 3 seconds, the 3185E will reset and require that the sequence be sent
completely again.

Operating With a 4-Digit Code:

When a 4-digit code sequence is selected on the 3185E the switch program will be as follows:

SWITCH 1 = first digit of the code sequence for both 'ON' and 'OFF'.
SWITCH 2 = second digit of the code sequence for both 'ON' and 'OFF'.
SWITCH 3 = third digit of the code sequence for both 'ON' and 'OFF'.
SWITCH 4 = fourth digit of the code sequence for 'ON' (preset to '*' if switch not installed).
SWITCH 5 = fourth digit of the code sequence for 'OFF' (preset to '#' if switch not installed).

If the 3185E is programmed for momentary relay output or alternating relay action SWITCH 5
is not used for programming.

18

Operating With a 3-Digit Code:

When a 3-digit code sequence is selected on the 3185E the switch program will be as follows:

SWITCH 1 = first digit of code sequence for both 'ON' and 'OFF'.
SWITCH 2 = second digit of code sequence for both 'ON' and 'OFF'.
SWITCH 3 = third digit of code sequence for 'ON'.
SWITCH 4 = third digit of code sequence for 'OFF' (preset to '*' if switch not installed).

If the 3185E is programmed for momentary relay output or alternating relay action SWITCH 4
is not used for programming.

Operating With a 2-Digit Code:

When a 2-digit code sequence is selected on the 3185E the switch program will be as follows:

SWITCH 1 = first digit of code sequence for both 'ON' and 'OFF'.
SWITCH 2 = second digit of code sequence for 'ON'.
SWITCH 3 = second digit for code sequence for 'OFF'.

If the 3185E is programmed for momentary relay output or alternating relay action SWITCH 3
is not used for programming.

Operating With a 1-Digit Code:

When a 1-digit code sequence is programmed into the 3185E the switch program is as
follows:

SWITCH 1 = first digit of code sequence for 'ON'.
SWITCH 2 = first digit of code sequence for 'OFF'.

If the 3185E is programmed for momentary relay output or alternating relay action SWITCH 2
is not used for programming.

ADJUSTMENT

Potentiometer R12 permits the user to adjust the level of the received DTMF tones. This
adjustment would be made when the received audio levels are too low or too high to permit
reliable decoding. Setting R12 fully counterclockwise will provide −10 dBmV of gain. Setting
R12 fully clockwise will provide +10 dBmV of gain.

Consult FIGURE 3 on page 7 for the location of potentiometer R12.

19