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Free Serial Port Monitor 3.31
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Free Serial Port Monitor 3.31

Publisher:HHD Software
Language:English, French, German, Italian, Russian, Spanish
Requirements:128MB RAM 5MB HD
Install:Install and Uninstall
Recommend Free Serial Port Monitor Suggest to Friend

Publisher's Description:

Free Serial Port Monitor - Free software serial port monitor, Com Rs232 sniffer with communication packet data analyzer. This monitoring utility can spy, capture, view, analyze, test com ports activity performing com port connection and traffic analysis with data acquisition and control. You can use this system as device interface testing tool, modem data transfer viewer and so on.

Serial Monitor can be successfully used for monitoring data flow between serial devices and Windows application, debugging com port connections, developing, reverse-engineering and implementing serial protocol, serial device driver development, serial hardware development, research the functionality of any third-party software and hardware, testing software and hardware.

Free Serial Port Monitor can be successfully used by programmers, beta-testers, software developers, hardware engineers, IT support specialists, industrial control personnel, SCADA software engineers, science technicians, systems integrators, consultants, lab experts, University students.

List of Changes:

Version 3.31 from 2005-05-25


Free Serial Port Monitor, RS232 Com Sniffer

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File Size: 2.8 Mb
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Latest User Reviews:

Steve Hall 2011-08-25 14:20:56 #
Version: 3.31

This program was recommended to me but I couldn't get it to work on Windows 7 Enterprise. It complained about needing administrative rights even though I am an administrator on this computer.

Hamish 2011-08-01 23:07:41 #
Version: 3.31

Excellent software, almost information overload! Very informative and helpful for diagnosing faults. Thanks!

Ovidiu Bardan 2011-07-06 11:24:09 #
Version: 3.31

Data received and sent through the port is conveniently displayed in a self-explanatory format in both HEX and ASCII. Good tool.

Spjatkin 2011-06-18 05:50:42 #
Version: 3.31

i cannot able to start Free Serial Port Monitor under Windows 7. The program always have not privileges to run, even i start "as administrator".

Alanwhite2001 2011-05-25 07:29:51 #
Version: 3.31

Just tried this on Windows 7 and it seems to do what I need. I'll comment further when I gain more experience.
Alan White, White Knight Consultants

M Razaulislam 2011-05-24 10:18:47 #
Version: 3.31

i was having difficulty in using the software... can anyone help me how to use it...

Tony 2011-05-16 01:57:23 #
Version: 3.31

Recommended to me by a colleague to reveal actual data produced by an app. Seems to to do it fine, thanks. Must explore it further!

G Cosulich 2011-04-06 06:14:31 #
Version: 3.31

It seems not working with 64 bit operating system.
Does it exist a dedicated software release?

Thanks in advance
Giovanni Cosulich

Axtellgreg 2011-03-03 13:58:35 #
Version: 3.31

I tried to load the software on my dell e55510 running system 7 and it would not let me.

Saraacasacci 2011-02-17 15:38:44 #
Version: 3.31

ho provato il software ed รจ risultato estremamente ben progettato ed utile! Grazie!

Mark Dixon 2011-01-18 14:50:55 #
Version: 3.31

Outstanding software. This monitor provided exactly what I was looking for - a method of simultaneously monitoring transmitted and received data entering or leaving the port while actually using the same port with a different application.


Sieg2288 2011-01-10 02:39:01 #
Version: 3.31

Installed successfully but failed to run on Win 7 Pro 64-bit

Ingrast 2010-11-18 12:25:57 #
Version: 3.31

In fact could not use it, kept crashing with Vista Home edition, even starting as administrator

Jason 2010-11-17 17:09:55 #
Version: 3.31

This worked well. Although downloading to a log was disabled in the free version, it gave you real time display of the serial port traffic as it was sent, and scrolled the history in a text box, so you could just copy and past it out if you wanted to keep it. It allowed me to solve my problem, so I'm a fan.

Proelect 2010-11-14 19:23:21 #
Version: 3.31

Hi , Its seems to be a very useful tool
as I can monitor whats actually going on
with Comms port.I use serial comms to communicate
with a variety of different equipment.

Thanks Mario

Dschroeder 2010-10-25 12:11:55 #
Version: 3.31

The software was used to capture Modbus RTU messages (hex characters) sent out a COM port. The software worked without issue, just what I needed.. and free too. I sent the captured results captured by Serial Port Monitor to CAS Modbus RTU Parser and got a readable file. Perfect.....

Patricia 2010-07-14 11:08:06 #
Version: 3.31

This software rocks, and I use it almost every day when testing serial data on the products we manufacture.
I only use the "data view" ability, but know this has some more powerful features I haven't tried.
I also do customer support over the phone and have had our customers download the software to help me troubleshoot their problems. When the com port isn't working, I can't tell from here, and this software comes in handy in SO many ways!
Thanks for such a great offering.

Mj Sbh 2010-06-23 23:30:18 #
Version: 3.31

I try to run this software on my new pc operate with Windows 7 but it won't work. Any other solutions..?

Dwh 2010-06-17 05:46:38 #
Version: 3.31

Failed to do what I wanted so uninstalled. Requirement was to log and time stamp RS232 data, not available in this product.

Phxyg 2010-06-16 03:38:46 #
Version: 3.31

I need to compare port activity between two computers one is running windows xp and the other is windows 95. Unfortunately, the software will not work for the old computer.

118 2010-05-23 01:07:24 #
Version: 3.31

excilent product have used a couple of times to debug 232 comms. helped a lot thanks

Victvem 2010-05-05 11:10:35 #
Version: 3.31

Thanks, good programm! She help me rezolved my problemm (diagnostic of my car).

Sdnl 2010-05-01 05:06:29 #
Version: 3.31

Very helpfull programm for test com port activity.

John Stacey 2010-04-27 08:44:21 #
Version: 3.31

Didn't work on my windows 7, 64 bit laptop (Dell Studio XPS)?

Schaafsma Engineering 2010-04-03 13:22:08 #
Version: 3.31

Well I am still searching how I can implement this. It looks prosperous. Hopefully I will have a good tool in my possession now.

Juan Luis Cantalejo 2010-03-26 04:10:59 #
Version: 3.31

Works really good

Aras 87 2010-03-26 00:19:34 #
Version: 3.31

Free Serial Port Monitor is a very useful tool in programming rs232. keeps track of broadcasts to capture errors, saves time.

Jackyb60 2010-02-27 10:15:14 #
Version: 3.31

I think that this nice tool can be usefull.

Frettore 2010-02-08 05:56:13 #
Version: 3.31

Very nice program!

Ruud 2010-01-20 14:22:21 #
Version: 3.31

Great free tool, gives perfect info about the trafic over your serial ports.

Emirepair 2009-12-28 03:07:30 #
Version: 3.31

Free serial port monitor worked perfectly. Was able to install and use in just minutes, no reading of instructions was necessary. Was easily able to capture serial commands sent between instruments for my school project.

Mufitsozen 2009-09-17 07:13:42 #
Version: 3.31

nice tool, simple and it works

Nevyn 2009-09-09 14:35:20 #
Version: 3.31

I installed the software and the part I needed (the logging) is limited to the paid version. I've not investigated further.

Davidzplace2003 2009-08-22 01:51:41 #
Version: 3.31

Easy to download program that worked well with easy to use functionality

Bandronic 2009-07-20 02:23:20 #
Version: 3.31

Great product! Love it!

Chot Don59 2009-07-15 06:29:52 #
Version: 3.31

it's a good tool.

Gaurav Gupta 2009-07-12 23:34:58 #
Version: 3.31

Though your product is free but i dont feel it as user friendly because i was not able find any control to send or receive data on the Serial port. Could you please help me out by providing me the solution to do so. please dont mind i just want to tell the truth.. i had a similiar serial port monitor from Eltima Software if you could provide user interface like that product it would become more user friendly..
Thanks & Regards
Gaurav Gupta
Deptt of IT

Wwonghk89 2009-05-28 12:46:17 #
Version: 3.31

I set up the "Free Serial Port Monitor" on a window machine and running the "CuteCom" on a linux box in parallel. The stream of data that receive in window machine is different from linux box.Don't have time to investigate but will try it later.

Aj5555 2009-05-10 15:34:23 #
Version: 3.31

Easy to install. Fairly easy to use. Performed flawlessly under XP. A valuable troubleshooting tool.

Jonah Bargmann 2009-05-05 12:27:06 #
Version: 3.31

The best serial port monitor around. My team and I have been using it for over a year or so. It being free makes it that much better.

Thanks for a great product.

Gpravi 2009-05-04 09:25:45 #
Version: 3.31

Too cumbersome. Not intuitive. Did not do the job I expected. Did not find it useful

Mgraham 2009-04-13 06:56:12 #
Version: 3.31

I used this previously for a Windows XP application,however, I needed to trouble shoot a problem on a Windows 98 system, and this software is not compatiable.

Jaakovj 2009-03-09 02:48:28 #
Version: 3.31

missing info

the sniffer misses protocol changes - baud rate, parity etc. in addition command timing is missing, i have a timeout problem i can't see with your tool. Thanks anyway.

Wantoki 2009-03-03 08:21:46 #
Version: 3.31

Serial port monitor

it is a handy utility for serial port communication monitor

Tmehrkam 2009-02-27 12:15:43 #
Version: 3.31

Serial port monitor

It worked as designed. I was hoping to be able to break the data stream into packets by specifing the special characters that mark the beginning and end of the stream I was trying to view. I was not able to find a way to do that.

Goosvanbeek001 2009-02-23 07:26:53 #
Version: 3.31

Can`t install SPM

I'm using Vista 64 and receive the message that I have to install it as Administrator, while I run the setup as Administrator.

John Maurer 2009-02-16 13:33:26 #
Version: 3.31

Pretty handy tool

Wish I'd found this a couple of years ago when I was doing more RS-232 debugging. The way Free Serial Port Monitor allows you to capture and display your PC's serial port data while being used by another application is very handy.

Ralph.rastaetter 2009-02-14 11:07:43 #
Version: 3.31

It didn`t work for me.

It didn't work for me. I could run it, or the application I wanted to watch, but not both.

Jon.mason 2009-02-04 02:21:25 #
Version: 3.31

Superb tool

This is great - it just does exactly what I hoped it would - and it's free!!!

Mwilliams 2009-01-20 18:40:35 #
Version: 3.31

Works ok

I have used the software for about to days. It does ok. It did lockup my com port on shutdown a couple times. Can't say why. I'm just looking for char's sent back and forth.

Ben 2008-12-08 06:46:03 #
Version: 3.31

Works Well

Easy to set up and easy to use... worked well for checking comunications. 2008-11-06 11:04:34 #
Version: 3.31

Very usefull app

It does all I need.
The price is unbeatable:=)

Tiago.azevedo 2008-10-30 06:04:57 #
Version: 3.31

very good

I needed a sniffer and was very pleased with your app, just one opinion:

in the COnsole View is to bad that only the incoming appears, and not the outgoing.

The rest I found it very good.


Post 2008-10-29 02:19:16 #
Version: 3.31

Monitor usage

Monitor not used due to Win98 OS on the computer.

Alessandro.bosoni 2008-10-23 06:23:57 #
Version: 3.31

Sw Quality Engineer

Free Serial Port Monitor is the best tool the net offer to developpers. It's very simple to use and powerfull. I have just an only one suggestion to complete the features of your should be great if the tool offered the possibility to send messages/files/ through serial port. In this way I think the tool should be complete.

D.pickering 2008-09-17 18:06:07 #
Version: 3.31

Well done

No complaints. It did the job I wanted. I have not explored all the features of the product but the ones I used worked well.

Stewp 2008-08-01 14:31:21 #
Version: 3.31

Everything It`s Cracked Up to Be

The serial port monitor proved to be everything it was touted to be. It provides a very complete picture of what is happening with your COM ports. It allowed me to reverse engineer how to communicate with a 3rd party application by monitoring how another application was able to communicate. It saved me hours and hours of effort. An excellent tool.

MainGofer 2008-07-27 17:37:23 #
Version: 3.31

Port Monitor with Data Capture Cards

I have been looking around for a simple and easy to use port terminal and checker for some gas analysers we are looking to send out into the field.
I downloaded the Free Serial Port Monitor on the off-chance that it would allow me to see that there was something on the other end of the serial cable and get some status information back from the analyser.
At the same time I was also keen to see whether the program could also detect and report on the signals from an Advantech PCI-1711L data capture card which also handles RS232 data.
Unfortunately in the short time that I played with this Port Monitor I was unable to get it to communicate with either the Analyser or the PCL Card ports. This may reflect the limited time that I applied to trying to use it, rather than any shortcomings on the part of the Port Monitor program.
It has got a very good set up wizard which allows you to set up the outputs and select the ports you want to look at.

Jesse 2008-07-03 15:31:14 #
Version: 3.31

Would like to see bytes in integer

Would like to view byte values in integers if possible. Would like to see packets between start and stop bits on separate lines. Good software though.

holdoun 2008-04-14 09:37:59 #
Version: 3.31

Useful tool

Easy to setup, use, and capture the required information.

VaughanHill 2008-03-25 16:19:50 #
Version: 3.31

Use as troubleshooter

I downloaded your software here at work at Airbus to see about an RS485 to RS232 interface I'm troubleshooting. Looks very good so far with useful windows. Looking into connections still though.

Thank you.

Steven P 2008-03-11 21:18:12 #
Version: 3.31

Clean and easy

While developing some interface software between a Handheld PC and a Serial device this product made it incredibly easy to see the Tx and Rx from each device during implementation and testing.

Parkwachter 2008-03-07 14:07:25 #
Version: 3.31

Nice ...

I am not quite sure if this is the last answer to analyzing app-tapi-comx-(voice!-)modem chains, but who is interested anyhow anymore.

I'd like to know more about the above chain und FSPM helped.

Looking at the supplied viewers lets you get along.

Thank you for supplying!

Mortenfj 2008-01-31 04:17:58 #
Version: 3.31

It can`t log.

I really like the program it's fast and easy to use, but it would be nice to have a "log" function, so in case of a crash the data would be logged for recovery at a later time. But then again. It's free so who am I to complain.

johncc 2007-10-20 14:39:41 #
Version: 3.31

Handy addition to developer`s toolbox

Quite valuable when an independent monitor is unavailable.

AlexOD 2007-09-05 17:25:21 #
Version: 3.31

Did the job.

Just what I needed to monitor a VT100 terminal driver. Hex/ASCII view allowed me to see all escape codes etc.

Would like to see "analyzer" or "'scope" like trace of all handshake lines as I debug.

cz 2007-08-23 18:34:49 #
Version: 3.31

An Absolute Must Have

I've used lots of serial analyzers, network analyzers, and so on, and the Free Serial Port Monitor is one of the best of this kind of product. I solved a problem with a serial interface in a few hours that I can't imagine how I would've ever solved without it.

If you're doing work with serial interfaces on Windows, you have to have this!

Ingenierio 2007-06-08 08:14:27 #
Version: 3.31

Review on Serial Monitor

I have been using sofwtare for more than a year and I have enjoy using it. It is very easy and friendly to set up the sessions. I have got most of my co-workers using this serial monitor and they all have enjoy it.

You have dpne an excellent job.

StanH 2007-04-05 03:17:29 #
Version: 3.31

Simple program, does the job well

This program is easy to use, and has all functionality I need. The wizard makes it easy to set up a session, and the visualizers give all the information you need.

I used it to analyze a data protocol, and later I can use it for debugging too.

DobiA 2007-02-06 09:03:34 #
Version: 3.31

doesnt work!

I've downloaded the HDD tool and every time I try to use it I get:unhandles exception.

Marc0000000 2007-01-17 14:08:19 #
Version: 3.31

excellent product

excellent product wish everything was this easy and useful

wilhelm 2007-01-07 06:30:48 #
Version: 3.31

Useful tool!

I needed a com port sniffer to analyze a communication between PC and a serial device (AC solar power inverter). This tool did the job after just a short and uncomplicated installation.
Use it!

Wee Willy 2006-10-02 13:23:58 #
Version: 3.31

Catching the culprit

I was looking for a "freebie" to check out a problem I am having with a random occurence in product control via RS-232. The monitor works really nice and is a lot more than I expected. I'm actually considering purchase of the standard version so I can use the logging feature instead of exporting data manually.

The problem I am trying to find has to do with serial responses getting out of sync with the respective queries. This happens randomly and for no apparent reason. What I needed was a log of everything that had happened previous to the problem, accumulate a number of instances for the problem and then compare the histories to see a common factor. The monitor does a good job of this and even provides time stamp info so it can be included in the analysis. Since the export data is format friendly, it is easy to pull back in and analyze with various tools.

Download Now
File Size: 2.8 Mb
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