| 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
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