Free Serial Analyzer

Free Serial Analyzer Features

Our Freeware Serial Port Monitor allows you to capture and decode monitored packets in real time even at high and non-standard data transfer rates. It supports all standard Bit rates of 75, 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 bit/s and non-standard rates as well.

• It intercepts and traces all Input/Output Control Code Requests (IOCTLs) and I/O Request Packets (IRPs) from DTE (data terminal equipment) and DCE (data circuit-terminating equipment) devices
• It displays the status of Serial (Modem) control lines: Transmitted Data TxD, Received Data RxD, Data Terminal Ready DTR, Carrier Detect DCD, Data Set Ready DSR, Ring Indicator RI, Request To Send RTS, Clear To Send CTS
• It monitors data from plug and play (PnP) serial ports and I/O ports (COM Ports) interfaced by 16550 UART: COM1, COM2, COM3, COM4 … COMn; custom and virtual serial ports registered and visible in Windows device manager under standard Ports (COM & LPT) device class.
• It may capture serial port traffic which flows via Com ports created by our Free Virtual Serial Ports.
• It supports monitoring of exchanged serial data from external devices connected to the PC via USB to Serial converters.

This Free COM Port Analyzer supports all standard Data bits, Parity (odd, even, mark, space), Stop bits, XON/XOFF Software and Hardware Flow control.

Paid editions of this product may also be used as affordable rs485/rs232 MODBUS sniffer, ACSII/RTU protocol analyzer and serial data logger.

If you are looking for non-intrusive software-based serial port monitoring solution to view serial protocol packets, this Free Serial Port Analyser is exactly what you need. This COM port monitoring tool requires no additional hardware and allows you to facilitate serial application development, debug protocol errors, view and test device failures.

Our Free Serial Port Monitor Usage Scenarios

You can use this communication viewer and debugger to analyze serial protocols. This will come in handy for:

• Serial protocol development, system integration and diagnostics
• Detecting errors in asynchronous data transmission
• Analyzing of data transferred between any RS232/422/485 device and Windows application
• Development of RS232, RS485 and RS422 peripheral devices and device drivers
• Debugging any serial port software or hardware, snooping serial data and control requests
• Researching functionality of any third-party hardware devices and software applications
• Debugging and testing different MODBUS devices
• Testing and troubleshooting serial protocols between device and device driver
• Analyzing and reverse-engineering RS-232/RS-422/RS-485 serial protocols

Free Software Serial Port Logic Analyzer Target Groups

Our free serial data parser, decoder and analyser is an extremely useful tool for the following target groups:

• Serial port device drivers and software application developers
• RS232/422/485 hardware developers, manufacturers and vendors
• System integrators and consultants
• Field and lab engineers
• Programmers, testers and other IT specialists
• SCADA software system engineers
• Industrial control equipment support specialists
• Science technicians and university students

Free Serial Protocol Analyzer allows you to capture communication data flowing between computer and the following serial devices:

• Dial-up Modems, Fax-Modems, mini-ATS, Computer terminals, teletypes
• POS terminals, shop till systems, Bar code scanners and other point of sale devices
• Industrial automation systems, RS232/485/422 industrial equipment
• Network equipment, Wireless LAN equipment, Serial device servers, NPort servers
• Console ports, Routers, Multiplexers, Hubs, Switches, firewalls, load balancers
• RS-232 to RS-422/485 converters, Multiport Serial Boards, Serial to fiber converters
• Printers, test instruments, scientific instruments, relays, lamps, Telescopes
• Test and measuring equipment, multimeters, oscilloscopes, manometers, sensors
• Network-enable serial devices, Serial device controllers, uninterruptible power supply
• Low-speed satellite modems, satellite phones, GPS receivers, other satellite based transceiver devices
• PLCs, VFDs, servo drives, CNC controllers, other CNC equipment programmable via RS232/422/485
• Entertaining equipment, simulators, MIDI-serial devices
• HVAC, door entry systems, other security systems
• Bar-code readers, Cash registers, Card readers
• Diagnostic equipment, software debuggers that run on a second computer

Our free com port snooper supports monitoring of legacy and PnP serial ports, serial to usb converters, serial adapters and software-based Virtual Serial Ports.

Supported Serial I/O Requests:

• IRP_MJ_WRITE
• IRP_MJ_READ
• IRP_MJ_POWER
• IRP_MJ_PNP
• IRP_MJ_INTERNAL_DEVICE_CONTROL
• IRP_MJ_DEVICE_CONTROL
• IRP_MJ_CREATE
• IRP_MJ_CLOSE

Supported Serial Device Control Requests:

• IOCTL_SERIAL_XOFF_COUNTER
• IOCTL_SERIAL_WAIT_ON_MASK
• IOCTL_SERIAL_SET_XOFF
• IOCTL_SERIAL_SET_XON
• IOCTL_SERIAL_SET_WAIT_MASK
• IOCTL_SERIAL_SET_TIMEOUTS
• IOCTL_SERIAL_SET_RTS
• IOCTL_SERIAL_SET_QUEUE_SIZE
• IOCTL_SERIAL_SET_LINE_CONTROL
• IOCTL_SERIAL_SET_HANDFLOW
• IOCTL_SERIAL_SET_DTR
• IOCTL_SERIAL_SET_CHARS
• IOCTL_SERIAL_SET_BREAK_ON
• IOCTL_SERIAL_SET_BREAK_OFF
• IOCTL_SERIAL_SET_BAUD_RATE
• IOCTL_SERIAL_RESET_DEVICE
• IOCTL_SERIAL_PURGE
• IOCTL_SERIAL_LSRMST_INSERT
• IOCTL_SERIAL_IMMEDIATE_CHAR
• IOCTL_SERIAL_GET_WAIT_MASK
• IOCTL_SERIAL_GET_TIMEOUTS
• IOCTL_SERIAL_GET_STATS
• IOCTL_SERIAL_GET_PROPERTIES
• IOCTL_SERIAL_GET_MODEMSTATUS
• IOCTL_SERIAL_GET_LINE_CONTROL
• IOCTL_SERIAL_GET_HANDFLOW
• IOCTL_SERIAL_GET_DTRRTS
• IOCTL_SERIAL_GET_COMMSTATUS
• IOCTL_SERIAL_GET_CHARS
• IOCTL_SERIAL_GET_BAUD_RATE
• IOCTL_SERIAL_CONFIG_SIZE
• IOCTL_SERIAL_CLR_RTS
• IOCTL_SERIAL_CLR_DTR
• IOCTL_SERIAL_CLEAR_STATS