Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Serial MCP Server list available serial ports"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
A Model Context Protocol (MCP) server for serial port communication, enabling LLMs to interact with hardware devices via serial connections.
List available serial ports
Open/close serial port connections
Read and write data to serial ports
Control serial signals (DTR, RTS, CTS, DSR, DCD)
Support for custom baud rates, data bits, stop bits, and parity
JSON and Markdown output formats
Related MCP server: UART MCP Server
# Install from PyPI (when published)
pip install serial-mcp-new# Run with stdio transport (default, for local use)
serial-mcp "mcpServers": {
"ssh-mcp": {
"command": "C:\\Users\\DELL\\AppData\\Local\\Packages\\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\\LocalCache\\local-packages\\Python311\\Scripts\\serial-mcp.exe",
"args": [],
"env": {}
}
},Tool | Description |
| List all available serial ports |
| Open a serial port connection |
| Close a serial port connection |
| Write data to a serial port |
| Read data from a serial port |
| Set control signal states |
| Read current signal states |
| List all active connections |
List available ports:
serial_list_ports()Open a connection:
serial_open(port="COM3", baud_rate=115200)Write data:
serial_write(connection_id="conn_1", data="Hello, device!")Read response:
serial_read(connection_id="conn_1", timeout=2.0)Close when done:
serial_close(connection_id="conn_1")Python 3.10+
mcp >= 1.6.1
pyserial >= 3.5
pydantic >= 2.0.0
MIT
Close a serial port connection.
Closes the specified serial port connection and releases resources. The connection ID becomes invalid after closing.
Args: params (ClosePortInput): Validated input parameters containing: - connection_id (str): Connection ID returned by serial_open
Returns: str: Success message or error message.
Success response: "Connection closed: conn_1" Error response: "Error: Connection 'conn_1' not found"
Inputs: params (required). Returns: result
Read the current state of serial port signals.
Returns the current state of all control signals including input signals (CTS, DSR, DCD) and output signals (DTR, RTS).
Args: params (GetSignalsInput): Validated input parameters containing: - connection_id (str): Connection ID returned by serial_open - response_format (ResponseFormat): Output format (default: 'markdown')
Returns: str: Formatted signal states or error message.
Success format for JSON: { "connection_id": "conn_1", "dtr": true, "rts": false, "cts": true, "dsr": true, "dcd": false }
Error response: "Error: Connection 'conn_1' not found or not open"
Inputs: params (required). Returns: result
List all active serial port connections.
Returns information about all currently open serial port connections.
Args: params (ListConnectionsInput): Validated input parameters containing: - response_format (ResponseFormat): Output format (default: 'markdown')
Returns: str: Formatted list of connections or empty message.
Success format for JSON: [ { "id": "conn_1", "port": "COM3", "baud_rate": 9600, "path": "COM3", "is_open": true, "created_at": "2024-01-15T10:30:00Z" } ]
Error response: "No active connections"
Inputs: params (required). Returns: result
List all available serial ports on the system.
This tool scans the system for available serial ports and returns detailed information about each port including device path, manufacturer, and serial number.
Args: params (ListPortsInput): Validated input parameters containing: - response_format (ResponseFormat): Output format (default: 'markdown')
Returns: str: Formatted list of serial ports.
Success response format: For JSON: Array of port objects with path, manufacturer, serialNumber, etc. For Markdown: Formatted list with port details
Error response: "Error: "
Inputs: params (required). Returns: result
Open a serial port connection.
Opens a new serial port connection with specified parameters. Returns a connection ID that must be used for subsequent operations on this port.
Args: params (OpenPortInput): Validated input parameters containing: - port (str): Serial port path (e.g., 'COM3', '/dev/ttyUSB0') - baud_rate (int): Baud rate (default: 9600) - data_bits (int): Data bits, 5-8 (default: 8) - stop_bits (float): Stop bits, 1.0-2.0 (default: 1.0) - parity (str): Parity: 'N', 'E', or 'O' (default: 'N')
Returns: str: Connection ID or error message.
Success response: "Connection opened: conn_1" Error response: "Error: "
Inputs: params (required). Returns: result
Read data from a serial port connection.
Reads available data from the serial port up to the specified maximum bytes. Times out after the specified timeout period if no data is available.
Args: params (ReadDataInput): Validated input parameters containing: - connection_id (str): Connection ID returned by serial_open - max_bytes (int): Maximum bytes to read (default: 1024, max: 65536) - timeout (float): Read timeout in seconds (default: 1.0) - encoding (str): Text encoding (default: 'utf-8') - response_format (ResponseFormat): Output format (default: 'markdown')
Returns: str: Formatted data or error message.
Success format for JSON: { "connection_id": "conn_1", "bytes_read": 42, "hex": "48656c6c6f", "data": "Hello", "timestamp": "2024-01-15T10:30:00Z" }
Error response: "Error: Connection 'conn_1' not found or not open"
Inputs: params (required). Returns: result
Set control signal states on a serial port connection.
Sets the DTR (Data Terminal Ready) and/or RTS (Request To Send) control signals.
Args: params (SetSignalsInput): Validated input parameters containing: - connection_id (str): Connection ID returned by serial_open - dtr (Optional[bool]): DTR signal state (True=HIGH, False=LOW, None=unchanged) - rts (Optional[bool]): RTS signal state (True=HIGH, False=LOW, None=unchanged)
Returns: str: Success message or error message.
Success response: "Signals set on conn_1: DTR=HIGH, RTS=LOW" Error response: "Error: Connection 'conn_1' not found or not open"
Inputs: params (required). Returns: result
Write data to a serial port connection.
Writes the specified data string to the serial port using the specified encoding.
Args: params (WriteDataInput): Validated input parameters containing: - connection_id (str): Connection ID returned by serial_open - data (str): Data to write as a string - encoding (str): Text encoding (default: 'utf-8') - timeout (float): Write timeout in seconds (default: 5.0)
Returns: str: Success message with bytes written or error message.
Success response: "Wrote 12 bytes to conn_1" Error response: "Error: Connection 'conn_1' not found or not open"
Inputs: params (required). Returns: result
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Scored across 8 tools
Each tool targets a distinct operation on serial ports: opening, closing, listing ports/connections, reading, writing, and getting/setting signals. There is no ambiguity between them.
All tools follow a consistent 'serial_verb' pattern (e.g., serial_open, serial_read, serial_write, serial_close, etc.), making it easy to predict tool names.
With 8 tools covering connection management, data I/O, and signal control, the count is well-scoped for a serial port server. No tool feels unnecessary or missing.
The toolset covers the core operations: open, close, list ports, list connections, read, write, get/set signals. A potential gap is flushing buffers or handling break conditions, but these are advanced and not essential.
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