Description
DT210 DTMF Decoding Encoder DTMF LCD Display Instrument Dual Tone Multi-Frequency Audio Decoding Digital Display
Product Description
Product application
Double tone signal decoding and coding; Signal generator; The remote control equipment;
Specification
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item
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value
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1
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Working voltage 7~12 VDC
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2
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Working current
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3
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Size 56*45*20 mm long X wide X height
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4
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Module interface:
(1) interface P1: VDD: power cathode interface. GND: power ground interface.
(2) the signal input interface J1: the audio input interface of 3.5MM.
(3) signal output interface J2: it is the audio output interface of 3.5MM.
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Interface display and Operation Description
(1) key Description: UP: is added to the key. DOWN: is self - reducing. ENTER: clear / emit signal. FUN: receive signal / send signal selection.
Receive DTMF code
Interface display font: The first line "Receive:" The second line "" Key operation: UP: was not used; DOWN: was not used; ENTER: clear screen FUN: set change (receive DTMF code / send DTMF code) Note: the received DTMF code is displayed in the second line.
Send DTMF code
Interface display font: The first line "Send:5" The second line "5645" Key operation: UP: self - added key; DOWN: self reducing key; ENTER: emits the selected DTMF code FUN: set change (receive DTMF code / send DTMF code) Note: the DTMF code is displayed in the second line.
Installation Instructions
Coding and decoding
When encoding, keystrokes or digital information are converted into two tone signals and transmitted. When decoding, the presence of keystrokes or digital information is detected in the received DTMF signals. A DTMF signal is made up of two frequency audio signals. The frequency of these two audio signals comes from two sets of pre assigned frequency groups: line frequency group or column frequency group. Each pair of such audio signals uniquely represents a number or symbol. There are usually 16 buttons in the phone, including 10 numeric keys 0~9 and 6 function keys *, A, B, C, D. Due to the principle of combination, there should be 8 different single tone signals. Therefore, there are 8 kinds of frequency, which is called multi frequency, and because it uses 1 kinds of combinations from low and low frequency, it is also called "8 in 2". According to CCITT's recommendation, the international frequency is 697Hz, 770Hz, 852Hz, 941Hz, 1209Hz, 1336Hz, 1477Hz and 1633Hz 8 kinds. Using these 8 frequencies, 16 different combinations can be formed, representing 16 different numbers or function keys.
Details Images