Serial Port Analyzer is the most precise RS232 testing software thanks to the possibility to reproduce the monitoring session in order to review certain port behavior with the same parameters used in different conditions. Eltima's Serial Port Monitor with the capability of 'sniffing' open serial ports on Windows platform was the best tool. The Serial Monitor plugin lets you monitor serial port activity, including open, close, serial setting change, control/status line change and of course, the actual.

Freeware RS232 port sniffer/monitor software Hi All I wonder if anyone knows of one of these? I'm looking for a Windows app which will monitor 'live' traffic from an RS232 port and display it in hex, ascii etc. So far I've downloaded and tried about 20 programs, none of which do what I want. The setup is my PC connected to another serial device and I want to watch the data flow. Most of the programs require a special cable to be made up, but I want to monitor TX and RX on a single port. Those that do allow live monitoring do not seem to work well with the rather unusual settings I'm using which are 9600,7,E,1. The problems they all seem to have is that they do not support 7 bit data and the 8th bit is sometimes erroneously set to 1 so 0x35 becomes 0xB5.

I can of course, work around this, but its prone to errors (mine!). If anyone knows of a package like this, either freeware or low cost shareware I'd be very grateful to hear of it.

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Cheers Steve. Hi, I have been using PortMon.exe avaliable at It allows you to monitor any RS232 com port, even if it is a USB to RS232 converter cable, I think it can also monitor a printer port. You don't need any special cables, it just monitors the data to and from the port.

You can set it to display the data in ascii or hex etc, and view the data live and save the data as a log file. It gives timing and error/timeout info, so you can see how long it takes the pic to respond to the incoming data. I have been using it to monitor the RS232 link between my WIN XP PC and a 18F4520, very handy while I was writing a bootloader. Here is a section of a hex log file between my pic and some ham radio control software. The 1st 17 lines show what commands the PC software sends to setup the com port, baud rate, hand shaking settings, buffer sizes, timeout periods etc. 0 0.00017097 HamRadioDeluxe. IRP_MJ_CREATE Serial0 SUCCESS Options: Open 1 0.00000307 HamRadioDeluxe.

IOCTL_SERIAL_SET_QUEUE_SIZE Serial0 SUCCESS InSize: 4096 OutSize: 4096 2 0.00000559 HamRadioDeluxe. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: TXABORT RXABORT TXCLEAR RXCLEAR 3 0.00000419 HamRadioDeluxe. IOCTL_SERIAL_GET_BAUD_RATE Serial0 SUCCESS 4 0.00000251 HamRadioDeluxe. IOCTL_SERIAL_GET_LINE_CONTROL Serial0 SUCCESS 5 0.00000223 HamRadioDeluxe. IOCTL_SERIAL_GET_CHARS Serial0 SUCCESS 6 0.00000223 HamRadioDeluxe.

IOCTL_SERIAL_GET_HANDFLOW Serial0 SUCCESS 7 0.00001090 HamRadioDeluxe. IOCTL_SERIAL_SET_BAUD_RATE Serial0 SUCCESS Rate: 9600 8 0.00000531 HamRadioDeluxe. IOCTL_SERIAL_CLR_RTS Serial0 SUCCESS 9 0.00000531 HamRadioDeluxe. IOCTL_SERIAL_CLR_DTR Serial0 SUCCESS 10 0.00000391 HamRadioDeluxe. IOCTL_SERIAL_SET_LINE_CONTROL Serial0 SUCCESS StopBits: ERROR Parity: NONE WordLength: 8 11 0.00000279 HamRadioDeluxe. IOCTL_SERIAL_SET_CHAR Serial0 SUCCESS EOF:1a ERR:0 BRK:0 EVT:0 XON:11 XOFF:13 12 0.00000419 HamRadioDeluxe. IOCTL_SERIAL_SET_HANDFLOW Serial0 SUCCESS Shake:0 Replace:0 XonLimit:1024 XoffLimit:1024 13 0.00000223 HamRadioDeluxe.