This is a Raspberry Pi Hat for converting the SPI interface into the RS485 interface. The Hat can control 2 RS485 interfaces working at the same time.
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This is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.
It is easy to control the 2-channel RS485 for auto transceiving via the SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.
1.SC16IS752 UART expansion chip2.ADUM1412 digital isolator3.PC817 optocoupler4.SP3485 RS485 transceiver5.B0505LS power supply isolation module6.RT9193-33 power chip7.SMAJ12CA transient suppress diode array8.Auto-recovery fuse9.Status indicator
PWR: power indicatorRXD/TXD: UART transceiving indicator
10.Raspberry Pi GPIO connector: for connecting Raspberry Pi11.RS485 terminal12.MCU control header: for connecting host control boards like Arduino13.120Ω terminal resistor switch14.Interrupt pin switch15.Operating mode selection
Half-auto: A=0, B=1Full-auto: A=1, B=0
Development resource: Wiki