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Bosch 909 Dual, 9xx cell phone

full pinout

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

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