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Vaisala RS41 Expansion Connector Pinout

Based on work by DF8OE

Viewed into port from outside

----------|     |----------
|  9    7    5    3    1  |
|                         |
|  10   8    6    4    2  |
---------------------------

Suitable Plug: Molex 87568-1073 (element14 order code 1365756)
Adafruit sell 2.54mm to 2mm patch leads (available from other resellers)

  • 1 - GND
  • 2 - I2C_SDA (PB11)
  • 3 - I2C_SCL (PB10)
  • 4 - +VDD_MCU
  • 5 - MCU Switched 3.3V out to external device
  • 6 - +V_Battery
  • 7 - RST
  • 8 - SWCLK (PA14)
  • 9 - SWDIO (PA13)
  • 10 - GND

STLink-v2 Header to Vaisala Cable

RS41			STLink 
------------------------------
1 or	 10	GND	4
2		N/C
3		N/C
4		POWER	1
5		N/C
6		N/C
7		RESET	15
8		CLOCK	9
9		DATA	7
10 or	1	GND	4

All other pins on STLink header not connected.
When using the Adafruit patch leads it is more convenient to use pin 10 as GND, since the 2mm ends are coupled as pairs.