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IMPORTANT: The pinout will be changed before release!

Pin assignments

Module seen from the top

W-Modbus Module Pinout

Pin functions

Pin Name Pin type Description
1 VSS Power Ground (0V)
2 MOSI Digital input SPI Master Out, Slave In
3 N.C. No connection Do not connect
4 N.C. No connection Do not connect
5 N.C. No connection Do not connect
6 MISO Digital output SPI Master In, Slave Out
7 VSS Power Ground (0V)
8 UART_TXD Digital output UART TXD
9 VSS Power Ground (0V)
10 RS485_DE Digital output RS485 driver control signal
11 RS485_RE Digital output RS485 driver control signal
12 nRESET Digital input Reset Pin (3.3V Max) (Pull-up)
13 N.C. No connection Do not connect
14 N.C. No connection Do not connect
15 UART_RXD Digital input UART RXD (3.3V Max)
16 SCK Digital input SPI Clock
17 N.C. No connection Do not connect
18 N.C. No connection Do not connect
19 N.C. No connection Do not connect
20 N.C. No connection Do not connect
21 N.C. No connection Do not connect
22 N.C. No connection Do not connect
23 VSS Power Ground (0V)
24 VSS Power Ground (0V)
25 VSS Power Ground (0V)
26 VSS Power Ground (0V)
27 VSS Power Ground (0V)
28 IRQ Digital output SPI Interrupt signal, active low
29 N.C. No connection Do not connect
30 N.C. No connection Do not connect
31 N.C. No connection Do not connect
32 BOOTLOADER Digital input Bootloader entry (3.3V Max) (Pull-up)
33 CS Digital output SPI Chip select, active low
34 N.C. No connection Do not connect
35 N.C. No connection Do not connect
36 VDD Power Power supply (3.3V)
37 VSS Power Ground (0V)
38 N.C. No connection Do not connect
39 N.C. No connection Do not connect
40 N.C. No connection Do not connect
41 N.C. No connection Do not connect
ANT RF ANT RF Antenna connector