Calculators that get the byte order right
Modbus frames, CRC polynomials, and register decoding — the fiddly parts of firmware and industrial protocol work, without a login or a desktop install. Everything runs in your browser; nothing you paste leaves your machine.
Modbus
Build, decode, and sanity-check RTU traffic without wiring up a gateway.
Modbus CRC16 Calculator
CRC-16/MODBUS for any hex payload, with the wire byte order spelled out.
Modbus RTU Frame Builder & Parser
Decode captured frames field by field, or build a request from scratch.
Modbus Register Decoder
Register pairs to float32/int32 across every byte order devices use in practice.
CRC & Checksums
Every common polynomial, plus custom parameters when a datasheet disagrees with the catalog.
Conversion
Move between hex, binary, floating point, and the byte orders real devices use.
IEEE 754 Float Converter
Flip bits directly and see the exact value a float really holds, not the rounded print.
Hex / Binary / Decimal / ASCII Converter
Base conversion with byte grouping and endian swapping.
In progressC Struct Padding Visualizer
Byte-level layout, padding holes, and a reordering that shrinks the struct.
Timing & Bus Config
Work out divisors, prescalers, and the error margins that decide whether a link is reliable.
UART Baud Rate Error Calculator
Best divisor for a clock and baud rate, with the error margin that decides reliability.
In progressCAN Bit Timing Calculator
Segments, sample point, and register values for classic CAN and CAN FD.