UART is an asynchronous serial communication protocol, meaning that it takes bytes of data and transmits the individual bits in a sequential fashion. This video describes how to enable UART on GPIO pins of RASPBERRY PI 3 B or B+ & to interface with GSM The port /dev/ttyAMA0 in PI 3 is allotted to Bluetooth hardware.

Features • RS-485 Half Duplex Port. • Up to 250 kbps transfer rate. • Use the Raspberry Pi to control external RS-485 devices. • Stackable with other Raspberry Pi accessory boards. • Mounting holes for use with the AB Electronics UK mounting kits (sold separately) The RS485 Pi is a communication board supporting the RS-485 serial protocol. The RS-485 port is connected to the UART port on the Raspberry Pi using a SN65HVD72 interface. The SN65HVD72 IC converts the 3.3V UART signals to RS-485 voltages allowing communication with RS-485 compatible devices over a DB9 serial cable or twisted pair cable.

The RS-485 port can be accessed through the DB9 port or the solder points on the PCB. The RS485 Pi contains protection against voltage spikes in the form of a TVS Diode and two 10-Ω, Pulse-Proof Thick-Film Resistors. Please note that you can only use one RS485 Pi board on a Raspberry Pi. If stacking with other boards we recommend putting the RS485 Pi at the top of the stack due to the height of the DB9 connector. Using RS-485*You need to use the latest Raspbian Jessie release and disable the built in Bluetooth to use the RS485 Pi on the Raspberry Pi 3, see our for the config changes needed. RS-485, also known as ANSI/TIA/EIA-485, TIA/EIA-485 or EIA-485 is a standard used in serial communication systems.

Equipment using the RS-485 standard can be used over long distances in noisy environments. Unlike RS232, the RS-485 standard allows for multiple devices to be connected on the same network.

The recommended arrangement for connecting devices to an RS-485 network is to use a series on nodes connected along a line or bus with terminating resistors used at either end of the bus to reduce reflections. A 120-Ω resistor is included with the RS485 Pi which will need to be fitted if the board is connected to the end of the RS-485 bus. The diagram below shows a typical network of RS-485 devices. Important Information This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by abelectronics.co.uk to be a finished end-product fit for general consumer use. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. Persons handling the product(s) must have electronics training and observe good engineering practice standards. This development board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

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Here’s how to add a 9-pin serial port to your Raspberry Pi, and it’ll only take you 10 mins. Well, maybe a couple of weeks to wait for the part to arrive from Hong Kong, but once it arrives, it’s only 10 minutes! 😉 Here’s the part you’ll need. It’s an RS232 to TTL converter module containing a MAX3232 chip.

The MAX3232 is important, as the older MAX232 won’t handle the 3.3v levels of the Pi, whereas the Max3232 will. It comes with a 4-way cable for connecting the module to the GPIO of your Pi. If you search on eBay for “RS232 Serial Port To TTL Converter Module MAX3232” you should find several.

The one I got cost me €3 with free shipping from Hong Kong. Here’s another view, showing the bottom of the module, indicating the +5V, GND, Tx and Rx pins. Simply attach the cable to the module, and connect to the 5V, GND, UART Rx and UART Tx pins of the GPIO. And a closer view of the GPIO connections.

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I removed the bolts from the module so that I could plug directly into the serial port of my laptop without a long serial cable. Once the module was attached to the laptop serial port, I downloaded PuTTY, and attached to the com port (usually COM1) at 115200 baud, 8 data bits, no parity, and no flow control. Once I applied the settings in PuTTY, I powered on the Raspberry Pi, and saw the entire boot process displayed out the UART of the Raspberry Pi and into PuTTY on the Laptop. A login prompt was displayed, and I could then log in over the UART as normal.