BWM ReferenceWiring
Wiring & protocols
Connection diagrams, signal tables and practical checks. Each guide states its scope and original sources.
RJ45 / 8P8C Ethernet: T568A and T568B
Match numbered contacts and twisted pairs when terminating Ethernet cable.
Phone jacks: RJ11, RJ14 and USOC terminals
Recognize telephone connector families and a documented screw-terminal conversion.
UART: TX, RX and a shared reference
Connect a logic-level serial adapter to a compatible board console.
RS-232: put a transceiver between UART and cable
Understand why an RS-232 port cannot connect straight to a logic-level UART.
RS-485: a half-duplex multidrop bus
Connect differential transceivers on a bus with controlled transmit direction.
CAN bus: controller, transceiver and termination
Separate the MCU's CAN signals from the two-wire physical bus.
I2C: two shared lines with pull-ups
Wire SDA and SCL for compatible sensors on a short local bus.
SPI: clock, data direction and chip select
Connect a host to a four-wire SPI peripheral without crossing the data roles.
SWD: connect a Cortex debug probe
Map the essential debug signals without confusing voltage sense with a power output.
JTAG: TCK, TMS, TDI and TDO
Understand the four core JTAG signals and their direction at a target.
RFID / NFC: reader, writer or emulator?
Choose the radio, supported tag protocol and host interface before choosing wires.
ELECHOUSE ST25R3916B: SPI wiring
Signal connections for the seven-pin module in the V0.3 Draft datasheet.
ELECHOUSE ST25R3916B: I2C wiring
The same module changes pin functions after hardware mode selection.
ELECHOUSE PN7160 MINI V1: I2C wiring
Wire the six-pin MINI module without borrowing the standard module's eight-pin map.
ELECHOUSE PN532 V3: choose the host mode
Select UART, I2C or SPI before following that interface's wiring diagram.
Original Black Wire diagrams explain connections. They are not additional physical board pinouts or independent electrical certifications.