# Peripherals

# RGB LED

## {{@264#bkmrk-open-iot-and-iiot-ga}}

The Gateway is equipped with 5 RGB user LEDs. 4 are mounted directly to the board, and the fifth is next to the not-programmable blue power LED on the PSU board.

<div drawio-diagram="1205"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737719679.png" alt=""/></div>

# Switch

## {{@264#bkmrk-open-iot-and-iiot-ga}}

The Open IoT Gateway contains a tactile switch mounted to the PSU board, which can be programmed directly in the MCU.

<div drawio-diagram="1206"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737719711.png" alt=""/></div>

# RS232 and RS485

## {{@264#bkmrk-open-iot-and-iiot-ga}}

The Gateway has 4 RS232/RS485 sockets depending on the version.

#### P10 (4x RS232)

The P10 gateway is equipped with 2x ST3232BTR to ensure transmission in RS232 standard.

<div drawio-diagram="1207"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737719852.png" alt=""/></div>

#### P11 (4x RS485)

The P11 gateway is equipped with 2x MAX481CSA to ensure transmission in RS485 standard.

<div drawio-diagram="1209"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737720135.png" alt=""/></div>

#### P12 (2x RS232, 2x RS485)

The P12 gateway is equipped with 1x ST3232BTR and 2x MAX481CSA to ensure transmission both in RS232 and RS485 standardsm

<div drawio-diagram="1208"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737719953.png" alt=""/></div>

# Ethernet PHY

## {{@264#bkmrk-open-iot-and-iiot-ga}}

The Ethernet interface is provided by the IP101G physical layer. An external board with an RJ45 socket ensures a wired connection to the network.

<div drawio-diagram="1210"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737720377.png" alt=""/></div>

# MicroUSB

## {{@264#bkmrk-open-iot-and-iiot-ga}}

MicroUSB ensures access straight to UART interface (UART4). The Open IoT Gateway does not have inbuild FTDI converter so an external USB to UART FTDI converter is needed to run a serial port monitor on a PC.

<div drawio-diagram="1243"><img src="https://doc.redisage.com/uploads/images/drawio/2025-02/drawing-29-1738845185.png" alt=""/></div>

# I2C EEPROM

## {{@264#bkmrk-open-iot-and-iiot-ga}}

The Open IoT Gateway has a built-in Serial EEPROM with a secure element connected to the STM32 via I2C bus.

<div drawio-diagram="1212"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737720455.png" alt=""/></div>

# Serial Flash

## {{@264#bkmrk-open-iot-and-iiot-ga}}

The Gateway has a Serial flash memory which can be programmed via SPI.

<div drawio-diagram="1214"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737720524.png" alt=""/></div>

# I2C Sensors (optional)

## {{@264#bkmrk-open-iot-and-iiot-ga}}

There is a possibility of connecting peripheral I2C sensors. The board has dedicated pins for soldering devices. Below is a proposal for additional sensors that match the hardware.

<div drawio-diagram="1215"><img src="https://doc.redisage.com/uploads/images/drawio/2025-01/drawing-29-1737720587.png" alt=""/></div>

- LSM6DS33 - 3D accelerometer and 3D gyroscope
- LIS3DH - 3-axis "nano" accelerometer
- HTS221 - capacitive digital sensor for relative humidity and temperature measurements
- SI7006-A20 / SI7020-A20 - humidity and temperature sensor

<p class="callout info">The presented devices are not included in the Open IoT Gateway.</p>