1 RS485 TX 1 d1/tx/pd1 Vin 1 Vin
2 RS485 RX 2 d0 rx/pd0 GND 2 GND
5 RS485 DE/RE 5 d2/pd2 a7 5
7 Echo D4 7 d4/pd4 pc5/a5 7 LED 1
8 Echo D5 8 d5/pd5 pc4/a4 8 Trig C
9 Echo D6 9 d6/pd6 pc3/a3 9 Echo C3
10 Trig D 10 d7/pd7 pc2/a2 10 Echo C2
11 Echo B0 11 d8/pb0 pc1/a1 11 Echo C1
12 Echo B1 12 d9/pb1 pc0/a0 12 Echo C0
13 Echo B2 13 d10/pb2 aref 13
14 Echo B3 14 d11/mosi/pb3 3V3 14
15 Trig B 15 d12/miso/pb4 pb5/d13/sck 15 LED 2