9
Table 2.5.1:
Using DB9 connector pins
Pin
Signal
Direction
Purpose
1
Not used
Shortened to the body of the system
2
RXD
Modem-PC
Received Data
3
TXD
PC-Modem
Transmitted Data
4
DTR
PC-Modem
Start and rest the modem (see chapter 3.3)
5
GND
General
Common Ground
6
Not used
Shortened to the body of the system
7
RTS
PC-Modem
Request to Send
8
CTS
Modem-PC
Clear to Send
9
Not used
Shortened to the body of the system
The purpose of pins is consistent with the serial interface to ITU-T V.24 Interchange Circuits DCE.
The length of the cable is not to exceed 1.8 m. It is recommended to set data transfer speed that does not
exceed 115,200 bit/s.
2.5.2. Power connector
The connector is used to power the device.
Fig. 2.5.2.
Power connector
Table 2.5.2:
Using connector power pins
Pin
Signal
Purpose
1
+ 12V
The positive pole of DC supply voltage. Fused circuit and overvoltage
protection (when input voltage of over 30V is applied) and reverse polarity
2
Not used
3
Not used
4
Not used
5
Not used
6
GND
Ground
Содержание MC52PU
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