v1.1.1

mbscan v1.1.1 — Multi-port scan & diagnostics

What's New

• Multi-port scanning — pass multiple ports as arguments or via -p with comma-separated list:

  mbscan /dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2
  mbscan /dev/ttyUSB*
  mbscan -p /dev/ttyUSB0,/dev/ttyUSB1

• Scan results report (-R) — summary at the end showing port, address, baud/format and register values. Enabled automatically on multi-port or universal scans (-T/-B/-D):

  === Scan results ===
    /dev/ttyUSB0      Slave   3 at 9600-8E1: [0]=100 [1]=200
    /dev/ttyUSB1      Slave  17 at 115200-8N1: [0]=50
  

• Write error diagnostics — if 3 consecutive write errors occur, mbscan stops scanning that port, listens passively for 500ms and attempts to identify what is connected:

  mbscan: 3 consecutive write errors on /dev/ttyUSB0 at 9600-8N1
  mbscan: port may be occupied by another device.
  mbscan: listening for incoming data (500ms)...
  mbscan: detected: GPS/NMEA stream
  mbscan: skipping port /dev/ttyUSB0.
  

  Detected protocols: GPS/NMEA, AT/LTE modem, ESP8266/ESP32 boot log, Modbus master, unknown text or binary protocol.
• Startup warning — mbscan reminds you to use it only on ports where Modbus sensors are expected.

Downloads

File	Platform	How to build
mbscan-linux-x86_64	Linux x86_64	gcc -O2 -Wall -static -o mbscan-linux-x86_64 mbscan.c
mbscan-linux-aarch64	Linux ARM64	aarch64-linux-gnu-gcc -O2 -Wall -static -o mbscan-linux-aarch64 mbscan.c
mbscan.exe	Windows x86_64	x86_64-w64-mingw32-gcc -O2 -Wall -static -o mbscan.exe mbscan.c

All binaries are statically linked — no runtime dependencies, just copy and run.

Usage

# Linux
mbscan /dev/ttyUSB0
mbscan -T -R /dev/ttyUSB0 /dev/ttyUSB1
mbscan -b 9600 -d 8E1 -f 1 -t 30 -c 4 /dev/ttyUSB0

# Windows
mbscan.exe COM3
mbscan.exe -p COM3,COM4 -T -R
mbscan.exe -b 9600 -d 8E1 -f 1 -t 30 -c 4 COM5

Note on timeouts

Default timeout is 100ms per address (~25 sec full scan). For faster scans use -o 20 (minimum recommended). Timeout -o 10 may miss devices, especially on Windows due to USB-Serial driver latency.

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Full documentation: README

v1.0.2 — Cross-platform release

mbscan v1.0.2 — Cross-platform release

Windows support added. Single source file now builds natively on Linux, Windows, and cross-compiles for ARM64.

What's New

• Windows support — native Win32 serial API (CreateFile, DCB, ReadFile/WriteFile), no POSIX emulation layer
• Built-in getopt for MSVC (no external dependencies on Windows)
• COM port handling — \\.\ prefix added automatically, COM10+ works without special syntax
• ARM64 builds — cross-compile with standard gcc-aarch64-linux-gnu, no OpenWrt toolchain required

Downloads

File	Platform	How to build
mbscan-linux-x86_64	Linux x86_64	gcc -O2 -Wall -static -o mbscan-linux-x86_64 mbscan.c
mbscan-linux-aarch64	Linux ARM64	aarch64-linux-gnu-gcc -O2 -Wall -static -o mbscan-linux-aarch64 mbscan.c
mbscan.exe	Windows x86_64	x86_64-w64-mingw32-gcc -O2 -Wall -static -o mbscan.exe mbscan.c

All binaries are statically linked — no runtime dependencies, just copy and run.

Usage

# Linux
mbscan -p /dev/ttyUSB0
mbscan -p /dev/ttyUSB0 -b 9600 -d 8E1 -f 1 -t 30 -c 4

# Windows
mbscan.exe -p COM3
mbscan.exe -p COM5 -b 9600 -d 8E1 -f 1 -t 30 -c 4

Note on timeouts

Default timeout is 100ms per address (~25 sec full scan). For faster scans use -o 20 (minimum recommended). Timeout -o 10 may miss devices, especially on Windows due to USB-Serial driver latency.

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Full documentation: README

v1.0.0

Initial release: fast Modbus RTU bus scanner