DFRobot RS485 Shield for Arduino | DFR0259 gprs 5 mm Stereo Audio Interface

5 mm Stereo Audio Interface

a footprint for optional CR1220 coin cell to keep the RTC running and allow warm starts and a tiny bright red LED

It can be widely applied to smart home control systems (SCS)

ACR122U is compliant with both CCID and PC/SC

2A (single pulse)

DFRobot RS485 Shield for Arduino | DFR0259 gprs 5 mm Stereo Audio InterfaceDescription: RS485 is an industrial standard for long distance, anti interference, and reliable communication. The Arduino RS485 shield, specially designed for the Arduino Uno board. It converts UART Serial protocol to the RS485 protocol. This RS485 board allows Arduino talk to industrial devices. In contrast to RS 422, which has a single driver circuit that cannot be switched off, RS 485 drivers use three state logic allowing individual transmitters