In the fuel sensor, the periodic data output mode must be turned off, and the network address and data
transfer rate must match the corresponding programmed parameters in the device itself.
2.13 Speaker and microphone connection
The speaker output is differential, but the polarity of its connection can be ignored, unless it is not specified
by the speaker manufacturer.
In the fuel sensor, the periodic data output mode must be turned off, and the network address and data
transfer rate must match the corresponding programmed parameters in the device itself. The speaker resistance
should be 4 ohms or 8 ohms. The speaker of the device is only turned on when the speakerphone is established
with the device.
An electret microphone capsule is connected to pins 1 (MIC +) and 3 (MIC-). This microphone capsule is
used in computer microphones in a compact enclosure with lavalier. It can be used both for listening to the car
interior and for establishing hands-free communication with the driver, paired with a speaker.
+
-
Speaker
4
2
3
1
14
7
13
6
12
5
11
4
10
3
9
8
2
1
6
5
4
3
2
1
«+»
«-»
Car battery
Fuse
(1А)
Microphone
«GND»
Figure 52. Speaker and microphone connection
Unlike a speaker, the microphone should be connected with strict polarity. To avoid interference with the
sound, signal during voice connection, the microphone should be connected with a shielded cable. The GSM antenna
of the device should be located as far as possible from the input connector of the device, the microphone and the
cable connecting them.
