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Unattended Answering Device

Monroe Electronics Model 3137B Unattended Telephone
Answering Device is an FCC-registered auto-answer telephone coupler on a 3" X 5" circuit card. The 3137B is designed to
interconnect unregistered customer equipment to the switched public telephone network.

Manual PDF



3171B

DTMF Encoder

The 3171B DTMF Encoder is a plug in circuit card, desinged to convert a 4 line BCD logic input into a DTMF audio output.
The 3171B can be provided with standard or special programming, allowing transmission of multi-digit tones when used with the 3223C or 3223B Encoder Controller. When provided with standard programming, the DTMF digits will be produced in response to the BCD inputs as shown in the table. When provided with special programming, the customer supplies the tones to be generated in response to the codes input.

Data Sheet PDF
Manual PDF
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3185E
DTMF Decoder

The Model 3185E Dual Tone Decoder is a microprocessor controlled DTMF decoder. The 3185E is capable of accepting a sequence of one to four DTMF® signals, and responds by activating it’s integral DPDT output relay. The relay action may be momentary, latching or toggling. Programming the code sequence is accomplished by digital rotary switches along the front edge of the PC board.


Data Sheet PDF
Manual PDF

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3223B
Encoder Controller

The 3223B Encoder Controller is a plug-in, 3 “ X 5” circuit card designed to convert a momentary logic input into a 4-line parallel BCD logic output.

The 3223B is used with the 3171B, containing special programming, to generate four 4-digit DTMF codes from four independent momentary logic inputs.


Data Sheet PDF
Manual PDF
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3223C
Encoder Controller

The 3223C Encoder Controller is a plug-in circuit card designed to convert a momentary logic input into a 4-line parallel BCD logic output.

The 3223C is used with the 3171B, containing special programming, to generate four 4 digit DTMF® codes from four independent momentary logic inputs.


Data Sheet PDF
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Monroe Electronics Inc., P.O. Box 535, 100 Housel Avenue, Lyndonville, NY 14098
phone:1-585-765-2254  fax:1-585-765-9330
Copyright ©1999-2017 Monroe Electronics, Inc.