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Pin assignments

Pin functions

W-Modbus module seen from the top

No Name Pin type Description
P1 VSS Power Ground (0 V)
P2 MOSI Digital input SPI Master Out, Slave In
P3 N.C. No connection Do not connect
P4 N.C. No connection Do not connect
P5 N.C. No connection Do not connect
P6 MISO Digital output SPI Master In, Slave Out
P7 VSS Power Ground (0 V)
P8 UART_TXD Digital output RS485 TX
P9 VSS Power Ground (0 V)
P10 RS485_DE Digital output RS485 Driver enable
P11 RS485_RE Digital output RS485 Receiver enable
P12 nRESET Digital input Reset Pin (active low, external pull-up)
P13 N.C. No connection Do not connect
P14 N.C. No connection Do not connect
P15 UART_RXD Digital input RS485 RX
P16 SCK Digital input SPI Clock
P17 N.C. No connection Do not connect
P18 N.C. No connection Do not connect
P19 N.C. No connection Do not connect
P20 SWDIO Digital input/output SWD Interface Data
P21 SWDCLK Digital input SWD Interface Clock
P22 N.C. No connection Do not connect
P23 VSS Power Ground (0 V)
P24 VSS Power Ground (0 V)
P25 VSS Power Ground (0 V)
P26 VSS Power Ground (0 V)
P27 VSS Power Ground (0 V)
P28 IRQ Digital output SPI Interrupt signal, active low
P29 N.C. No connection Do not connect
P30 N.C. No connection Do not connect
P31 N.C. No connection Do not connect
P32 BOOTLOADER Digital input Bootloader entry (active low, external pull-up)
P33 CS Digital output SPI Chip select, active low
P34 UART_MGMT_TX Digital output UART management TX
P35 UART_MGMT_RX Digital input UART management RX
P36 VDD Power Power supply (3.3 V)
P37 VSS Power Ground (0 V)
P38 N.C. No connection Do not connect
P39 VSS Power Ground (0 V)
P40 N.C. No connection Do not connect
P41 N.C. No connection Do not connect

Note: Low frequency I/O is a signal with a frequency up to 10 kHz. For detailed information about pin functionality, see the Nordic Semiconductor nRF52840 product specification document.

RF Antenna connector

When connecting an external antenna the u.FL on the top of the module shall be used. The antenna shall have the characteristic impedance of 50 ohm at 2.45 GHz. See the Antenna guideline for more information.

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