Mesh Extender 2.0 Standard Power Cable Pinout

Proposed Pinout for Mesh Extender 2.0 PCB Version 4 onwards

While building a test cable, it became clear that the pinout could be improved to make assembly of the cables easier, and also to spread the strain on the D-SUB connector more evenly.

NOTE: This pinout is INCOMPATIBLE WITH THE PREVIOUS VERSION. IT WILL DESTROY Version 2 / Revision 3 Mesh Extender PCBs (and vice-versa).

NOTE: This pinout is only proposed at this point in time. Do not build cables to this specification, until confirmed.

D-SUB 25 Female 4-way IP67 3-way IP67 24LC16BH Note
1 - - 4 (Vss/GND) GND
2 - - - RFD_IO4
3 - - - RFD_IO3
4 - - - GND
5 Connect to pin 18 Domino TX
6 Connect to pin 19 RFD TX
7 Connect to pin 20 Vin Solar (connect to Vin REG when using solar panel or automotive as power supply)
8 - Brown - Solar/Auto input +
9 - Blue - Vin Auto. Optionally tie to pin 10 with 25k5 resister to ensure maximum charge current when using automotive power.
10 - Yellow/green - Solar/Auto -
11 - - - Domino RTS
12 - - - Domino GPIO 0
13 - - - Domino GPIO 1
14 - - 5 (SDA) RFD_IO5
15 - - 6 (SCL) RFD_IO1
16 - - 7 (WP) RFD_IO6
17 - - 8 (Vcc) RFD_IO2
18 Connect to pin 5 RFD RX
19 Connect to pin 6 Domino RX
20 Connect to pin 7 Vin Regulator
21 Yellow/Green - - GND
22 Blue - - +5V
23 Brown - - Battery +
24 Black - - Battery -
25 - - - Domino CTS

Version 2 / Revision 3 PCB

The following table is correct for the Version 2 PCB, i.e., the third revision, including proposed errata.

Compared with the previous arrangement, we are now using the 3-wire lead for the solar panel/automotive input, and the 4-wire one for battery and +5V output, since it seems more probable that batteries and a USB charging port would be located together inside, while the solar panel alone remains outside.

NOTE: There is NO REVERSE POLARITY PROTECTION on the Mesh Extender PCBs at the moment. This is clearly not ideal, but it is the situation for now.

D-SUB 25 Female 4-way IP67 3-way IP67 24LC16BH Note
1 - - - GND
2 - - - GND (Was RFD_IO2 on rev 2 PCB)
3 - - - RFD_IO3
4 - - 4 (Vss/GND) RFD_IO4
5 Connect to pin 6 Domino TX
6 Connect to pin 5 RFD RX
7 Connect to pin 20 Vin Solar (connect to Vin REG when using solar panel or automotive as power supply)
8 - Blue - Vin Auto (connect to Vin REG when using 12v/24v automotive power supply only). Pull down to ground with 25k5 if automotive charging fails to draw sufficient current).
9 - - - Domino GPIO 0
10 - - - Domino CTS
11 Brown - - Battery +
12 - Brown - Solar/Auto input +
13 Blue - - +5V
14 - - 8 (Vcc) RFD_IO2 (Was GND on rev 2 PCB)
15 - - 7 (WP) RFD_IO6
16 - - 6 (SCL) RFD_IO1
17 - - 5 (SDA) RFD_IO5
18 Connect to pin 19 RFD TX
19 Connect to pin 18 Domino RX
20 Connect to pin 7 Vin Regulator
21 - - - Domino RTS
22 - - - Domino GPIO 1
23 Black - - Battery -
24 - Yellow/green - Solar/Auto -
25 Yellow/Green - - GND

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