Supports RS-232C, RS-422/485, and TTL (UART, I2C, and SPI) without expansion board

Multi Protocol Analyzer



Perfect model with statistical Analysis
function and program simulation

Max Speed 2Mbps(full duplex)
Capture memory 64MB, Max 32GB SD card or USB flash
Analysis timing troubles
lack of signal voltage
760g, A5-size, battery driven 7 hours
Wi-Fi remote control (supported only in Japan, USA, Canada, and EU)

LE-3500R : Japanese model ( contains Japanese manual )
LE-3500R-E : World wide model ( contains English manual )

LE-3500R/LE-2500R adopted TTL port as its standard besides RS-232C, RS-422, and RS-485 while having the same feature such as small and light body of LE-3500/LE-2500. You can monitor I2C or SPI without expansion board.

It incorporates versatile analysis functions and excellent portability, thus fully supporting the development tests, after-sale services and trouble analysis. LE-series have been used in the industries of railways, aviation, and a variety of manufactures for few decades. With optional kits, it can be used for developing in-vehicle and embedded devices. Unlike the software based analyzers, it cannot be affected by the capability of PC and can be used in the place where PC is not allowed.

Mega Speed Measurement

<Baud rate setting display>
Baud rate setting display
You can test measurement of high-speed communications up to 2.048Mbps. Using high precision DPLL technology for open baud rate support, transmission and reception speeds can be separately set to an effective 4 digits.

Multi-Protocol Support

Multi-Protocol Support is Provided as standard Features

The analyzer has RS-232C, RS-422/RS-485, and TTL as its standard interface. TTL prove cable comes with the analyzer. RS-422/RS-485 connector of the analyzer is removable terminal.

<Protocol setting display>
Protocol setting display
<Interface setting display>
Interface setting display
Expansion kits supports TTL, I2C, IrDA, CAN and LIN

Protocols of differing hardware specifications are supported by simply changing the measurement boards.

Simply pull out the interface board from the measurement unit and replace it with an expansion board for another protocol.


Support Modbus communication for Field bus protocol
< Example of usage of analyzer for Modbus communication>
Diverge Modbus communication on RS-485 line and measure by the analyzer.
It is able to measure high-speed Modbus communication, detecting idle time for 3.5 characters which will be a frame end.
Support Modbus-ASCII and Modbus-RTU telegram structure. LRC/CRC frame check are automatically made according to the data format, and error check/error trigger are available.
<Example of usage of analyzer for Modbus communication>
<Normal display of Modbus>
<Frame display of Modbus>

Auto Save... Long Recording Time

Saving the captured data to
USB flash or SD card
External memory
up to 32GB
Supports optional SD card
(such as SD-32GX) or USB flash
The auto save function makes it possible to continuously save up to 64Gbyte. It automatically saves the content of the capture memory into a SD card or USB flash. And it continuously saves data into the measurement log of a user-specified file size, using ring recording as long as the card has space. In addition, it is useful for identifying communication failures which occur at rare intervals.
Target Line Speed 
Continuous Recording Time Reference*1
Main memory Only When Using 32GB external memory*2
9600bps Approx. 4hrs. Approx. 1900hrs.
115.2Kbps Approx. 18min. Approx. 160hrs.
1Mbps Approx. 140sec. Approx. 20hrs.
*1: Calculated for full-duplex transmission of 1,000 byte data frames per sec. Both transmission and reception data consume 4 byte of memory with each capture.
*2: When using SD-32GX or 32GB USB flash memory.

Logic Analyzer Analysis And Signal Voltage Measurement

Communication line timing is analyzed and displayed as a logic analyzer display to a time resolution of max. 50ns. The new function of signal voltage measurement ensures ease of the voltage measurement of RS-232C signals and voltage swing of TTL in places where tester probes cannot reach smoothly.
<Example of logic analyzer measurement>
Example of logic analyzer measurement
<Example of signal voltage measurement>
Example of signal voltage measurement

PC Link

Measurement data can be used on your PC with the light edition of the PC link software attached to the analyzer, or by using free text conversion software or print data acquisition software. The PC link software supports USB connection and Wi-Fi connection (Wi-Fi function is supported only in Japan, USA, Canada, and EU), and remote measurement is possible by connecting multiple analyzers at the same time. It also supports display of measurement data saved in a memory card or USB memory, data conversion, etc.

Note: The light edition of LE-PC300R limits it monitoring time for 10 minutes and the number of files of text conversion (at the same time) up to 3. The full edition of the PC link software "LE-PC300R" (available as an optional product) does not have these limitations.

Beside real-time data transfer, external memory devices are also available.



Multiple connection by Wi-Fi (supported only in Japan, USA, Canada, and EU)


Wi-Fi connection is available via accesspoint or direct connection. (supported only in Japan, USA, Canada, and EU) Online Monitoring

Online Monitoring

<Example of connection for online monitoring>
Example of connection for online monitoring
The online monitor function, like a sniffer, records telegrams in the capture memory and provides an easy-to-understand display for the type of protocol, without affecting the communications line.
LINE EYE protocol analyzers record not only communications data but the time (time stamp) of transmissions and receptions as well as idle time. Therefore, failure time and timeout status can be checked.
As a standard feature, the analyzer support various communications standards from asynchronous to packet switching systems.
Depending on the test, you can select bit transfer sequence and polarity, as well as modulation format from NRZ, NRZI, FMO and FM1. The feature allows to support effective analysis by omitting SYN codes and using SDLC/HDLC address filter.
<Time stamp / idle time display>
Time stamp / idle time display

<Example IrLAP protocol translation>

<Example PPP translattion>
Example PPP translattion

<Timing data display>
Timing data display
Special data items are
expressed in individual signs.
Display special data items, such as errors and HDLC frags etc. in individual signs.
Short Frame
Block check code (Normal)
Block check code (Abnormal)
Parity error
Framing error
Parity and Framing Error

Line State LED
Line State LED
communications line state is indicated in real time using 2-color LEDs

Time Stamp Measurement
Record the data and the time of transmission / reception for data frames. ASYNC cannot recognize the length of frame. Thus, our analyzers decide the frame end when it finds the specific character, or when it passes the specific time of being non-communication. Time stamp will be displayed in above 2 situations.
* Specifies OFF, day / hour / minute, hour / minute / second, or minute / second / 10msec.
Non-communication state which works as the frame end detection time of ASYNC and Burst communications can be set from 1 to 100ms.
* If there are some frame with same time stamp, it is because the analyzer measured the frames in 10ms.

Idle Time Measurement
The amount of idle time between communications frames can be measured.
* Specifies OFF or a resolution of 100msec., 10msec. or 1msec.

Trigger Function
The trigger feature allows you to specify a communications event as the trigger condition and have measurement operations executed automatically when that condition is specified. Up to four pairs of conditions and operations can be set, which is helpful towards identifying frequent intermittent faults that occurs with communications systems. And, the operation of a trigger condition can be specified as the condition for another trigger, making it possible to analyze complicated operations based on sequential trigger.

Trigger Condition Communication error (Parity, MP, framing, BCC, break, abort, short frame can be specified individually.), communication data string up to 8 characters (don't care and bit mask available), idle time more than the specified duration, match time/counter value, logic status of interface signal line and external trigger input
Trigger Action Stops measurement/test (offset can be set), validates trigger condition controls timer (start/stop/restart), controls counter (count/clear), activates buzzer, saves monitor data on a memory card, sends the specified character string (during manual simulation), and sends pulse to external trigger terminal OT2.
<Trigger setup summary display>
Trigger setup summary display

<Trigger condition setup>
Trigger condition setup

<Trigger action setup>
Trigger action setup

Statistical Analysis Measurement
<Graph of Statistically analyzed data>
Graph of Statistically analyzed data
Statistics can be compiled for transmission and reception data sets, frames and the number of established trigger events, and subsequently displayed as a graph (Unit: 1 to 240min.). This helps to understand communications traffic and error frequency for a specific time period.

Monitor Condition Auto Setting
The analyzers can analyze communications data and automatically set basic measuring conditions, such as communications speed, character framing, data code, synchronization character, BCC/FCS, etc. This is effective for monitoring lines of unknown communications conditions.
* The auto setting is available only for ASYNC, SYNC/BSC, and HDLC/SDLC. This function is not accurate with small volumes of communications data or data that contains many errors.
<Search display>
Search display
<Determination display>
Determination display

Delay Time Measurement
A feature to measure the voltage of four RS-232C signal lines has been added to the conventional delay time function used to analyze the delay time of control line changes (e.g., RTS to CTS changes) at a resolution of 0.1ms. <Delay time measurement>
Delay time measurement


With the simulation feature, the LINE EYE protocol analyzers act as the counterpart to the target device and perform transmission and reception tests according to protocol. Even in the early stages of development when matching devices are not available, tests can be run at near to actual operating status. After checking the communications protocol step by step in the analyzer's own original MANUAL mode, a developer can create a simple program to branch conditions using menu selection and test more complicated communications protocols.
Communications speed can be freely set. Therefore, margins can be evaluated by intentionally shifting communications speed, and error response processing can be checked using test data that mixes in data with parity errors.
< Control lines and data transmission timing >
Control lines and data transmission timing
Example of connection
for simulation
Example of connection for simulation

The manual mode allows you to send the data registered in the transmission table which corresponds to the "0" to the "F" keys. The data can be set with one press of a key. By using expansion data table, with 10 table groups of “0” to “9” you can select the send data from max 160 data. While checking replies from a unit under development with the monitoring feature, you can easily and simply test the communications process. You can also send fixed data by registering it under a key combination of the SHIFT and "0" to "D" keys, as well as turn RTS/CTS and DTR/DCD signal lines on/off with the SHIFT and "E"/"F" key combinations. < Transmission table setup display >
Transmission table setup display

Flow control can be simulated on the transmission and reception-lines using X-on/off flow control or the control line handshake. In the transmission mode, up to 16 cycles of data from transmission start until a generated interrupt request can be displayed. In the reception mode, you can set the number of received data cycles until a transmission interrupt request is generated, as well as the time until the transmission resume request is generated. <Flow control test setup display>
Flow control test setup display

In the echo mode, the analyzer internally return received data. Buffer echo to send back data by a reception frame, character echo to send back data by a character and loop back echo that simply loops back data can be selected. It is used to test display terminals and communications terminals. <ECHO mode setup display>
ECHO mode setup display

The polling mode simulates the slave and master units in multidrop (1:N connection) polling protocols. In the slave mode, the analyzer check the number of received frames that are assigned their address and whether errors occur or not, replying with user-set data. In the master mode, they send polling messages to 32 slave units, and check and display replies from each slave. <Polling setup display>
Polling setup display

In the buffer mode, you can select transmission and reception, and send transmitted or received data that has been captured in the buffer using the unit's monitoring capabilities, as simulation data without requiring further manipulation. This mode is effective in conducting reproducibility tests using the same data as that monitored under actual communications conditions. <Buffer data reproduction setup display>
Buffer data reproduction setup display

By creating a purpose-specific command program, the communications protocol can be flexibly simulated alongside condition monitoring. The program is created using the menu selection, so it is easy to master. <Program display>
Program display
[ PROGRAM mode commands ]
Command Operation
SEND CHR  Sends max. 8 data sets.
SEND REG  Sends data registered in transmission table under specified REG No.
SEND TBL  Sends specified transmission data table.
SEND BRK Sends break signals (only for ASYNC)
WAIT CHR  Waits until receiving specified data (max. 8 data sets).
WAIT FRM Waits until receiving 1 frame.
WAIT TM   Waits for specified amount of time.
GOTO L Jumps to specified label No.
CALL L Jumps to subroutine of specified label No.
IF  CHR  L Branched if specified data in reception buffer.
IF  LN  = L Branches if interface line is specified logic.
SET  REG   Sets or increases/decreases value of specified REG No.
SET  TM    Controls specified timer and sets to specified value.
INT TRG 0 L Interrupts specified label when trigger 0 condition is satisfied.

BERT(Bit Error Rate Test)

BERT support enables you to measure transmission quality of communications lines by a loop-back or interactive connection. It is possible to measure evaluation parameters (bit error count, block error count) conforming to ITU-T G.821 Notification, hence enabling bit error rate evaluations and fault point identification. Elaborate test patterns and functions such as bit error forced interrupt are comparable to dedicated equipment.
<BERT setting display>
BERT setting display
Evaluation is possible in ASYNC or SYNC mode, by specifying measurement period (continuous, received bits, duration) or test pattern.

<BERT measurement display>
BERT measurement display
Once started, the results of measured line quality are displayed and updated in real time.
Example connection for BERT
Example connection for BERT
BERT Measurement Content
Communication mode Can select the ASYNC or SYNC mode.
Test Pattern
CONTINUE : Continuous measurement
R-BIT : Continues the test until the number of effective received bits exceeds the designated value.
RUN TIME : Continues the test until the measurement time exceeds the designated value.
Pattern 26-1, 29-1, 211-1, MARK, SPACE, ALT, DBL-ALT, 1in4, 1in8, 1in16, 3in24
Measured Data
Savail Available measurement in seconds 0 to 9999999
R-Bit Effective bits received 0 to 9999999 to 9.99E9
E-bit Error bit count 0 to 9999999 to 9.99E9
Bit-ER Bit error rate 0 to 9.99E-9 to 1
E-Sec Error in seconds 0 to 9999
Loss SYNC loss count 0 to 999
R-Blk Effective blocks received 0 to 9999999 to 9.99E9
E-Blk Block error count 0 to 9999999 to 9.99E9
Blk-ER Block error rate 0 to 9.99E-9 to 1
%E.F.S Normal operation rate 0.000 to 100.000%

Menu-Based Simple Operation

Anyone can easily operate the analyzer owing to the easy menu selection system handed down from earlier models. <Top menu display>
Top menu display

Offline Analysis and Data Searches
Search Key Communications error (individual error type can be specified), communications data string of max. 8 characters (DON'T CARE and bit mask can also be specified), idle time beyond a specified duration, specific time stamp (DON'T CARE can also be specified), external trigger matching data
Search Operation Find and display, counting
Measurement data displays can be freely scrolled and paged. A powerful search feature allows you to locate specific data and perform counting.
<Search key setting>
Search key setting
Using "DON'T CARE (*)," you can search for time stamp data from 10:30:00 to 10:39:59 as in this example.

PC Compatible File Management Specification
Test conditions and results such as measured data can be saved on optional SD cards or USB flash in the file management format compatible with your PC. Of course, files can be interchangeably used between models. Therefore, measurement data can be saved on-site with LE-2500R, and analyzed or manipulated in greater detail using LE-3500R back in the office.
* The LE-8200(A), LE-3500(R), LE-2500(R), LE-1500, LE-7200, LE-3200, LE-2200, and LE-1200 are compatible in measurement data file. Part of files or data saved in higher hierarchy models or new models, hower, may not be available in lower hierarchy models or conventional models.
Types, names, sizes and the data/time of files saved in the memory card can be checked. <File operation display>
File operation display
File type Measurement data (.DT), Trigger save data (TG SAVEnn. DT),
Auto save data (#nnnnnnn. DDT), Measurement Conditions (.SU), Transmission data for simulation (.ST), Simulation Program (.SP)
File operation Displaying normal file or designated type of files, Save, Load, Deletion, Format
When many files have been saved, the file filter feature allows you to specify the type of file to be displayed.
This is set to display data betwen 0:00 on August 1, 2008 and 23:59 on August 31, 2008.
<File filter setup>
File filter setup

Updating to Firmware
You can download the latest version of software from our website to take advantage of the latest functions and features. -> Download

Auto RUN/STOP for Unmanned Measurement
By setting time and a data of measurement start and end, measurement can be done automatically during the specified time period. < Auto run display >
Auto run display

Various Print Formats
Measurement data of a user-specified range can be printed out continuously from any printer. And, with a dedicated printer, you can print hard copy images of computer displays and continuous images of logic analyzer waveforms.
Various Print Formats
Printing Sample image  -> sample1 | -> sample2 | -> sample3 | -> sample4