node-red-nodes/io/serialport

node-red-node-serialport

Node-RED nodes to talk to hardware Serial ports.

Install

This node is sometimes installed by default in Node-RED so may not need to be installed manually.

Run the following command in your Node-RED user directory (typically ~/.node-red):

    npm i node-red-node-serialport

During install there may be multiple messages about optional compilation. These may look like failures... as they report as failure to compile errors - but often are warnings and the node will continue to install and, assuming nothing else failed, you should be able to use it. Occasionally some platforms will require you to install the full set of tools in order to compile the underlying package.

Usage

Provides two nodes - one to receive messages, and one to send.

Input

Reads data from a local serial port.

Clicking on the search icon will attempt to autodetect serial ports attached to the device, however you many need to manually specify it. COM1, /dev/ttyUSB0, etc

It can either

• wait for a "split" character (default \n). Also accepts hex notation (0x0a).
• wait for a timeout in milliseconds from the first character received
• wait to fill a fixed sized buffer

It then outputs msg.payload as either a UTF8 ascii string or a binary Buffer object.

If no split character is specified, or a timeout or buffer size of 0, then a stream of single characters is sent - again either as ascii chars or size 1 binary buffers.

Output

Provides a connection to an outbound serial port.

Only the msg.payload is sent.

Optionally the character used to split the input can be appended to every message sent out to the serial port.