Online Serial Monitor: HEX, Text & CRC

Connection

Serial portBaud rate

Data bitsStop bitsParityFlow control

Match the device settings. Close other apps using this port. The browser does not expose COM names to this page.

Receive settings

Display

Frame boundaryIdle gap (ms)Frame length (bytes)

TimestampsShow TXAuto-scroll

Idle framing uses browser arrival times, not wire timing. LF/CRLF are included in the frame.

Sequence settings

Advance to next commandInterval after send/response (ms)

Response timeout (ms)Retries on timeout

Response match formatResponse contains (optional)

Blank accepts any complete frame. A match does not validate the protocol. Stop after the retry limit.

Repeat sequenceStop automatic sending in background

Configuration

Remember settings and commands here

Stored only for this site in this browser. Export to transfer between languages or computers.

Import configuration

Filter displayed content

No matching traffic to display.

Command 1FormatData

Checksum

AlgorithmByte order

Line endingInterval (ms)

Command 2FormatData

Checksum

AlgorithmByte order

Line endingInterval (ms)

Command 3FormatData

Checksum

AlgorithmByte order

Line endingInterval (ms)

Send a command fileUTF-8 text file