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Pinouts for Nokia 3250
Connector:

Pinouts:
pin: description:
1 RX2
2 Gnd
3 F-Bus Rx
4 M-Bus / Clk
5 F-Bus Tx
6 Vpp
7 USBPowDet (USB Power Detection) / V-Bus
A Vcc
B BSI
C Gnd