Anticyclone Systems Ltd

AntiLog RS232 Serial Port Data Loggers

High Performance RS232 Data Logging Solutions

Current revision: V8.0b (Dual channel and Multi-unit release)   NEW

Logging Important RS232 Data

  • Do you need a low cost, reliable way to log RS232 serial port data?
  • Looking for something small, portable, low power and light weight to slip into your pocket and easy to use?
  • Need to record binary, ASCII or a mixture in any format you want with no resolution or formatting issues?
  • Would like to log from one or two pieces of equipment at the same time, but don't want to use PCs or Laptops?
  • Don't want to worry about losing data because the recorder battery has run out?
  • Need to just switch on and leave the equipment data logging for several days at a time?
  • Just want to push an 'On' button to do the lot instead of running application software?
  • Don't want to wait for your system to 'boot up' each time you just want to log something?
  • Want to initialise your equipment in the field but don't want to bring a PC or Laptop with you?
  • Need to log a large number of serial port sources all controlled from just one serial port connection?

Then the AntiLog range of solutions is the ideal way to record your RS232 data without requiring a PC or laptop computer. In use throughout the world, this simple to use, high performance data logging solution simply plugs into your RS232 data source and is ready to log data immediately.

AntiLog Key Features

AntiLogPro OEM
  • Available in boxed or OEM form factors.
  • Very low power operation.
  • High capacity storage capability (supports up to 1TByte).
  • Easy to use so trials can be performed by non-technical staff.
  • High performance, e.g. full rate recording at 921,600 baud (AntiLogPro).
  • Baud rates: 300 to 460,800 (600 to 921,600 for AntiLogPro).
  • Uses the most comprehensive terminal configuration menu system.
  • Can record and playback up to two independent channels simultaneously.
  • Powerful time stamping options, even for full eight bit binary data.
  • GNSS NMEA sentence filtering and sub sampling options for each channel.
  • Single or dual channel event recording.
  • User output commands, equipment polling.
  • Real time playback (even for dual channel output).
  • Option to simulate up to two independent GNSS receiver outputs whilst recording.
  • Wide power source operating range from 4.5V to 18V.
  • No need for "config jumpers", "setting switches" or media configuration files.
  • AntiLogPro OEM units can combine into one large multi-unit data logger all controlled from just one serial port.
  • Built in bootloader allows new embedded software upgrades via the internet.

All you need to get you started is an RS232 serial port terminal application on any platform to allow you to see and interact with the built in menu system. Serial port terminal applications are readily available including our free AntiTermPro PC based application from Anticyclone Systems Ltd which has been specifically designed to support all of the AntiLog product range and features including data retrieval and multi-unit operation.

For a more complete description of AntiLog's capabilities, please take time to view the following product information sheet for the current AntiLog embedded software release:-

Description File Type File
Product information for AntiLog V8.0 PDF AntiLog V8.0 Product Info Sheet

See the upgrade release history for AntiLog products here.

User Friendly Operation

Simply push the 'On' button to start AntiLog recording your serial port data. Hold the 'Off' button down to stop a data logging session and switch the unit off. Simply switch on and off like this to continue RS232 data logging as you require, data will be appended to the store - it's as easy as that!

Boxed AntiLog Unit

You hold the 'On' button down for more than a second to put the unit in playback mode. In this mode, you can configure the system to your needs. A menu system appears which you can view and operate using any serial port terminal application. With this menu system you define exactly how AntiLog handles data recording and playback. This is how you set recording and playback serial port settings, recording and playback modes (e.g. 'real time') and all other options.

While in playback mode, simply push the 'On' and 'Off' buttons as many times as you want to start and stop data replay. You hold the 'Off' button down for more than a second to switch the unit off as before.

You are not restricted to playing back data at the same baud rate it was recorded. You can also optionally embed recorded time tag information in playback data streams. All settings are non-volatile so you only have to set them once even if all sources of power are removed.

Low Power Consumption

There is no need to transport an enormous power source around with you because instead of consuming hundreds of milliwatts or more of power, AntiLog can record RS232 data happily for days on a single PP3 battery. As an example, AntiLog uses typically just 58mW (including media power consumption) to record full rate continuous binary data at 9,600 baud and around 90mW at 115,200 baud.

All AntiLog units have the ability to dynamically reduce power consumption based on baud rates in use (less than 115,200) and data stream content. AntiLog units consume less power if no RS232 data is being received or transmitted. This means AntiLog is ideal for recording GNSS/GPS NMEA receiver data which is generally transmitted at a rate significantly less than 115,200 baud with gaps between messages.


AntiLogPro is an advanced version of the original AntiLog design available as a boxed or OEM module with dual channel data recording as standard. It provides the following additional features:-

Boxed AntiLogPro

(Media card part extracted)

  • Very high performance. Full rate recording on one channel at 921,600 baud or up to 460,800 baud on two channels simultaneously.
  • Fully configurable RS232 line management including individual line inversion and power saving options.
  • Logging of digital logic line states (inputs protected to ±40V).
  • Baud rates supported: 600 to 921,600 and user defined.
  • Transfer settings from one unit to another simply by connecting them via a NULL modem cable and pressing the "On" button.
  • Selectable "Ring Buffer" storage method to retain the most recent data.
  • Assign any of the three (OEM) or two (boxed) hardware serial ports to the recording, playback and menu system functions.
  • Onboard real time clock with battery backup.
  • Combine many units as one (multi-unit support, OEM only)
  • GNSS navigation receiver simulated output option available (simulate up to two channels of GPS NMEA for user defined locations in real time).
  • Hardware 1PPS synchronization output signal for accurate timing applications (OEM only).

Description File Type File
Product information for AntiLogPro OEM PDF AntiLogPro OEM Product Info Sheet.pdf

See the upgrade release history for AntiLog products here.

AntiLog vs AntiLogPro

The following table describes the main capability differences between the AntiLog and AntiLogPro hardware design variants when running V8.0 of the embedded software.

Capability AntiLog AntiLogPro
Number of hardware serial ports supported 2 3 *
Maximum supported baud rate (each channel) 460800 921600
Maximum full rate single channel data logging (baud) 230400 921600
Maximum full rate dual channel data logging (baud per channel) 115200 460800
Battery test voltage indicator (maximum) 9.9V 18.0V
Pins that can be used as logged digital inputs 5 9 *
Bi-colour LED state indicators 1 2
User invertible RS232 lines (e.g. for direct CMOS level logging) N Y
Selectable “ring buffer” storage method N Y
One Pulse Per Second (1PPS) output time stamp reference N Y *
Transfer settings between units connected via NULL modem cable N Y
Dual channel simulated GNSS receiver output option (option 'G') N Y
Multi-unit support using third Auxiliary port N Y *

* Requires OEM version of the product to gain access to extra pin header connections.

OEM Modules

AntiLog OEM AntiLogPro OEM
AntiLog OEM AntiLogPro OEM

The fully boxed product comes ready to use. Use our OEM modules to embed a high quality, single board, RS232 data logging solution into your own application. The OEM modules are built to last in demanding situations. They use robust surface mount construction and measure only 50mm x 60mm. The AntiLog OEM module is functionally identical to our boxed product but it allows direct access to the removable FLASH media (socket mounted under the card) and allows direct access to CMOS RS232 levels.

The OEM boards only require the addition of a power source, two push to make switches ('On' and 'Off' buttons) and a bi-colour LED (two for the AntiLogPro variant) to realise a complete RS232 data logging solution. You can use the standard 2.54mm pitch, header to interface directly to your application. The pin header for example, allows direct connection with OEM equipment (e.g. OEM GPS receivers) which require RS232 signal connections at CMOS levels.

For completely unattended use, we offer a Forced Power hardware option (the 'P' option). With this option, you simply apply power to start data logging and remove power to stop logging. Apply and remove the power as much as you want to append data to the store. This option is ideal in applications where user interaction is not practical such as in vehicle installations, Unmanned Aerial Vehicles (UAVs), process control systems in hostile environments or for AntiLogPro OEM modules in a multi-unit configuration.

Single or Dual Channel Logging

For most data logging applications you will only need to record RS232 data from a single equipment source (e.g. a GPS receiver). However, the latest AntiLog V8.0 release offers menu options to log and playback up to two RS232 data sources at the same time. It's just like having two single channel AntiLogs in a single box. For dual channel logging, the RTS/CTS lines on the main serial port connector become the second serial port. You can configure each port for completely independent operation (e.g. different baud rates, filtering, time stamping options, etc). Each port supports it's own equipment polling and it's response to button pushes during a recording session.

Not only is it possible to record from two channels simultaneously, but you can play back two recorded sets of channel data at the same time, even in real time. V8.0 also offers saving and retrieving of complete sets of user options to a named store to allow almost instant reconfiguration of your units for different trials applications. This is particularly useful if you share a unit between applications as you can recall a complete configuration using a single menu option.

If you record two channels of RS232 data using the one AntiLog unit, the two data streams also share a common time stamping reference which can be ideal for later data analysis.

Multiple Channel Data Logging

If you need to log a large number of RS232 data sources at the same time then you can configure multiple AntiLogPro OEM units into one large multi-unit data logger. Up to a theoretical maximum of 255 AntiLogPro OEM dual channel data loggers can be connected together to act as one multiple channel data logger. All units are controlled from a special dedicated multi-unit Auxiliary bus serial port which can freely command units on the bus to switch between record and playback modes at any time. Our free AntiTermPro supporting application includes full support for multi-unit operation in a GUI form.

The Complete Data Logging Solution

AntiLog Zip Up Case

All boxed versions of AntiLog come complete with all you need to get you started. You get an RS232 NULL modem cable (to allow you to connect AntiLog to a PC or equivalent to upload recorded data), a printed manual, an Alkaline PP3 battery - and you even get a zip-up carry case!

If the equipment you wish to log data from has a serial port connection designed to fit into a standard PC, simply plug this instead into AntiLog and you are ready to record the output from the equipment.

All AntiLog units now come as standard with an embedded software bootloader which means you can now receive software upgrades via the Internet.

AntiLog Options

There are various Option Packs available to further extend the features in AntiLog.

Option 'P' - Forced Power

Starts logging data as soon as power is applied. Stops logging when power removed. Available for OEM units only. Designed for power sources in the range 9.5 to 18V (e.g. automotive). The recommended option for AntiLogPro OEM units used in a multi-unit configuration.

Option 'M' - Government and Military GPS Receiver Extension

This option allows easy capture and replay of ICD-GPS-153, ICD-GPS-150 and similar (ICD-GPS-15x) Government and Military data streams.

See more...

The 'M' option provides the following capabilities for the V8.0 release:-

  • Includes all standard functions available in AntiLog.
  • ICD-GPS-150, ICD-GPS-153 (ICD-GPS-15x) data stream compatible.
  • Message 'autoconnect' feature to automatically request up to 8 user defined message IDs.
  • Automatically sends out acknowledgements in response to acknowledge requests.
  • LED flash sequence in record mode to show when checksum validated messages are being received.
  • Compatible with RS232 output from SPGR, PLGR, DAGR and similar GPS receivers.
  • Selectable 'real time' playback of ICD-GPS-15x data.
  • Selectable time tagging of all incoming IP messages to 1ms resolution.
  • Button pushes (button events), digital inputs and supply voltage can be inserted into data stream as custom IP messages during a trial.
  • User defined equipment commands can be issued by button pushes and/or at a user defined repeat period.
  • Real time playback can make use of any time tags in the logged data.
  • Playback can hide (raw playback) or expand the time stamps into the output stream.
  • Time tagging and message events implemented as intelligently inserted custom IP messages.

As AntiLog can log two independent channels of data, you can for example log two channels of time stamped ICD-GPS-153 data at the same time with individual messaging requirements, or for example, one channel of ICD-GPS-153 data and one channel of filtered NMEA (both with or without time stamping enabled of course).

Option 'G' - GNSS Simulated Receiver Output

Can simulate up to two channels of GNSS (Global Navigation Satellite System) receiver output at user defined fixed positions whilst logging data in record mode. Selectable NMEA messages are transmitted during a recording session with the current time and date embedded in the output message stream. Can simulate signals from GPS, GLONASS, Galileo, BeiDou and integrated navigation signal sources.

Option 'S' - Security Option

Allows a password to be set to prevent unauthorised access to the menu system to alter configured settings.

Do You Need Ten Or More Units?

For multiple orders, the following price break discounts apply
10 to 24 units 7.5%
25 to 49 units 11%
50 to 99 units 14.5%
100+ units 18%
We are able to supply very much higher quantities as required.
Please contact our distributor below for more details on higher volume pricing.

Purchasing AntiLog and AntiLogPro Units

Martelec Limited (based in the United Kingdom) are our approved international distributor for all of our AntiLog product range. Please visit the Martelec website where you can purchase units now or you can contact Martelec about your data logging requirements. The Martelec shop also hosts a range of high quality accessories including dedicated cables and power supplies to support the complete AntiLog product range.

Martelec Logo Visit the Martelec Website Cards and are web domains owned by Martelec Limited, UK

You can contact Anticyclone Systems Ltd at any time by email at

Detail may be subject to change without notice. Data applicable to AntiLog embedded software V8.0b

(c) Anticyclone Systems Ltd, 2020 Updated: 26-May-2020