 20 pin Bosch cellphone special connector at the mobile phone (keypad up) | Full pinout for Bosch 909 Dual (without S):Bottom
Pin
| Name
| Direction
| Description |
|---|
| 1 | GND |  | Ground, for all Bosch 9xx |
| 2 | DCD | -?- | Data Carrier Detect |
| 3 | DTR | -?- | Data Terminal Ready |
| 4 | RTS | -?- | Ready To Send |
| 5 | CTS | -?- | Clear To Send |
| 6 | DSR | -?- | Data Set Ready |
| 7 | IGN | -?- | Outside Device Present, if so put not more then 2,7 Volt in |
| 8 | GND | | Ground |
| 9 | SPK | -?- | Speaker, needs to be amplified |
| 10 | GND ANA | -?- | Ground analog |
| 11 | MIC | -?- | Microphone Elektret |
| 12 | PHP | -?- | Phone Present, puts out a LOW, it"s not ground |
| 13 | HEADSET | -?- | HeadSet Present, put a LOW in Sounds switched to HeadSet |
| 14 | TXD | -?- | Transmit Data |
| 15 | | -?- | that we dont know, but used by Bosch-Applications |
| 16 | BATT | -?- | Battery +, max. 10mAmps |
| 17 | | -?- | that we dont know, but used by Bosch-Applications |
| 18 | RXD | -?- | Receive Data |
| 19 | CBUS | -?- | CBUS for programing the phone - applicable to all Bosch 9xx |
| 20 | CHARGE | -?- | Charge + not more than 7 Volts |
Pins other than GND, CBUS may be different in other than 909Dual models
Source:www.pinouts.ru
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