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    node-red-node-serialport

    0.15.0 • Public • Published

    node-red-node-serialport

    Node-RED nodes to talk to hardware serial ports.

    Install

    To install the stable version use the Menu - Manage palette - Install option and search for node-red-node-serialport, or 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 three nodes - one to receive messages, and one to send, and a request node which can send then wait for a response.

    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.

    Request

    Provides a connection to a request/response serial port.

    This node behaves as a tightly coupled combination of serial in and serial out nodes, with which it shares the configuration.

    Send the request message in msg.payload as you would do with a serial out node. The message will be forwarded to the serial port following a strict FIFO (First In, First Out) queue, waiting for a single response before transmitting the next request. Once a response is received (with the same logic of a serial in node), or after a timeout occurs, a message is produced on the output, with msg.payload containing the received response (or missing in case if timeout), msg.status containing relevant info, and all other fields preserved.

    For consistency with the serial in node, msg.port is also set to the name of the port selected.

    Install

    npm i node-red-node-serialport

    DownloadsWeekly Downloads

    11,240

    Version

    0.15.0

    License

    Apache-2.0

    Unpacked Size

    69 kB

    Total Files

    10

    Last publish

    Collaborators

    • knolleary
    • dceejay