Multi-protocol analyzer LE-1200-E
This model is discontinued. The successor is LE-1500/LE-2500R.
LE-1200 : Japanese model ( Japanese manual )
LE-1200-E : World wide model ( English manual )
The LE-1200-E is a protocol analyzer for ASYNC communication supporting both RS-232C and RS-422/485. On-line Monitor function can analysis ASYNC communication up to 250Kbps in real time. The dedicated options allow it to support current loop and TTL communications.
See options LE-PC300G | Interface Sub Board | Option Table
See details on product Specifications | Appearance | Standard Accessories
[ Features ]
Can measure up to 250Kbps based on user-defined speed of 4 digits.
Comes standard with RS-232C and RS-422/485.
Comes standard with simulation and BERT functions.
Can translate asynchronous PPP which is available over internet.
Auto save function allows to continuously record data into the dedicated CF card of 1GB.
Logic analyzer functions support 50ns resolutions for timing analysis in bits.
Can use measured data on PC via an optional PC link software.
Has a built-in nickel-hydrogen battery (8-hour use for 2.5-hour recharge).
Compact size (B5 size and 940g), including a carrying bag to carry.

Supports measurement of a Max. 250 Kbps

Regardless of test conditions, such as trigger setting, LE-1200-E assuredly monitors and records full-duplex data communications of a max. 250 Kbps in real time. Recording is made into the buffer memory of the analyzer. < Baud rate setting display >
Baud rate setting display

Multi-Protocol Support

LE-1200-E comes standard with measurement interface for RS-232C (V.24) and RS-422/485 (RS-530) standards.
Multi-Protocol Support Multi-Protocol Support
Expansion Kit Broadens the Range of Use
RS-232C and RS-422/485 support comes as a standard feature. Using a dedicated expansion board helps you test 3V/5V TTL level (*) or current loop communications.
* TTL level asynchronous communications (microcomputers or communications LSI asynchronous serial boards, etc.) are supported but not I2C or clock-synchronized communications.
Replace expansion boards
Simply pull out the interface board from the measurement unit and replace it with an expansion board for another protocol.
Replacement TTL Expansion Kit Expansion Adapter
TTL (I2C not available) current loop
TTL Expansion Kit Expansion Adapter

Auto Save... Long Recording Time

Built-in memory card
(PC card) interface
Memory card 2GB
Built-in memory card MC-2GCF
The auto save function makes it possible to continuously save up to 1G byte. It automatically saves the content of the capture memory on a high capacity compact flash (CF) card. 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 rare communication failures of the unknown cause.

*Before using MC-2GCF
If you are using LE-1200-E with the version such as 1.11 or before, please update to 1.12 or later. Firmware is available for downloading from the support page.
Target Line Speed
Continuous Recording Time Reference
Main Monitor Only When Using
When Using
9600 Approx. 4min. Approx. 30hrs. Approx. 120hrs.
115.2K Approx. 20sec. Approx. 2.5hrs. Approx. 10hrs.
250K Approx. 10sec. Approx. 72min. Approx. 5hrs.
*Calculated for multiplexed transmission of 1,000 byte data frames per sec. Both transmission and reception data consume 4 byte of memory with each capture.

Logic Analyzer Display

Analyzes timing trouble in bits
Communication line timing is analyzed and displayed as a logic analyzer display to a time resolution of max. 50ns. This function helps to identify the problems with hardware. Also, you can use it as educational use, comparing documents for communications protocol.
< Logic analyzer display >
Logic analyzer display
Measurement between the cursors at 12 micro sec.

PC Link

Use measurement data on PC via dedicated application.
Manipulate measurement data on your own PC. By connecting the serial cable, the measurement log is recorded to HDD of a PC (*1). Moreover, the record log on a memory card are converted to the text format on a PC (*2) to use.
*1:Requires an option, PC software (LE-PC300G).
*2:Includes software with the analyzer for converting saved data on the memory card to the text format and capturing the text output (printing data) from the analyzer.
PC Link SoftwarePC Link SoftwarePC Link Software
(*) LE-1200-E

Online Monitoring

The online monitor feature records communications data in the capture memory and provides an easy-to-understand display for the type of protocol, without affecting the communication line. LINE EYE protocol analyzers record not only communications data but the time (time stamp) of transmission and reception as well as idle time. Therefore, failure time and timeout status can be checked. In addition, it is available for the trigger function which detects specific communication conditions and for the recording function to select the specific address frames which helps you to effectively use the memory.
Example of connection for online monitoring
Example of connection for online monitoring
< Time stamp/idle time display >
Time stamp/idle time display
< PPP translate display >
PPP translate display
< Timing data display >
Timing data display
Line State LED
Line State LEDs
2-color LEDs show state of communications lines.
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 find the specific character, or when it pass 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.
* The example indicates that received time of last data was 20min. 56.37sec(M / S / 10mS setting)
* If there are some frame with same time stamp, it is because the analyzer measured the frames in 10ms. (example : start from 20Mitute 56Second 370ms and 20Mitute 56Second 379ms)
Idle Time Measurement
The amount of idle time between communications frames can be measured.
* Specifies OFF or a resolution of 100msec., 10msec. or 1msec.
* The example indicates there was an idle time of 7 to 7.9ms(1mS setting)
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 Event Communications error (individual error type can be specified), communications data string of max. 8 characters (DON'T CARE and bit mask cab also be specified), logic status of interface signal line, matching to timer / counter value, idle time beyond a specified duration, external trigger input
Trigger Operation Buzzer sounding, measurement recording stop (offset can be specified), save monitor data on memory cards (the range can be specified), timer control (start, stop, and restart), counter control (count and clear), trigger condition activation, transmission of specified text string (in MANUAL simulation)
< Trigger setup summary display >
Trigger setup summary display
< Trigger condition setup >
Trigger condition setup
< Trigger action setup >
Trigger action setup

Delay Time Measurement
Enables to measure min. / max. / average time of until some signal state is changed to another state and the number of its times. It is useful for delay analysis of control line RTS-CTS and so on. < Delay time measurement display >
Delay time measurement display


Example of connection for simulation
Example of connection for simulation
With the simulation feature, 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. You can check communications protocol step-by-step in the MANUAL mode. 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.

The manual mode allows you to send data registered in the transmission table which corresponds to the "0" to the "F" keys. Data can be sent with the press of a key. While checking replies from a unit under development with the analyzer's 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 the "D" keys, as well as turn RS and ER signal lines on/off with the SHIFT and the "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 sixteen 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 mode setup display >
Flow mode setup display

In the echo mode, the analyzer internally return received data in units of bits, bytes or frames (character string). It is used to test display terminals and communications terminals, and to set loop-back points for the BERT feature.

BERT(Bit Error Rate Test)

With BERT (Bit Error Rate Test) functions that comply with ITU-T G.821 Notification, you can evaluate quality of communication lines. They are helpful in measuring error rate in communications lines that include modems and terminal adapters, as well as in identifying failure points.
< BERT measurement display >
BERT measurement display
Starting measurement updates the measured results of line quality in real time. With REPEAT mode, you can know the bit error rate of every specific time on a communication circuit.
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 9999
R-Blk Block error count 0 to 9999999 to 9.99E9
E-Blk Block error rate 0 to 9999999 to 9.99E9
Blk-ER Effective blocks received 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.

Comparison table of
asynchronous communications models

< Top menu display >
Top menu display

Offline Analysis Data Searches
Measurement data display can be freely scrolled and paged. A powerful search feature allows you to locate specific data and perform counting.
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), trigger matching data
Search Operation Find and display, 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 microdrives, compact flash cards and other memory cards in the file management format compatible with your PC. Of course, files can be interchangeably used between models such as LE-7200-E, LE-3200-E, LE-2200-E, and LE-1200-E. Therefore, measurement data can be saved on-site with LE-3200-E, and analyzed or manipulated in greater detail using LE-7200-E back in the office.
* Not available to use memory cards for LE-1100-E.
This function allows you to check files saved into memory cards by type, name, size, and/or date. < 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 there are so many files saved in a memory card, this function enables you to specify the types of files you wish to display on the screen.

This image shows the setup to display the trigger save data only from Feb. 14, 2005 at 12:00 to Feb. 14, 2005 at 20:59.
< 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. < Print out setup>
Print out setup

Comparison table of asynchronous communications models
Model New Product LE-1200-E Traditional Product LE-1100-E
Interface Standard RS-232C, RS-422/485 RS-232C
Option TTL, Current loop RS-422/485, TTL, Current loop
Capture memory 1.2M byte 192K byte
Transmission speed 50bps to 250Kbps (user defined) 50bps to 115.2Kbps (33steps)
Protocol ASYNC, asynchronous PPP
(can select bit transmission order or bit polarity)
Time measurement Idle time Can select OFF, 100m sec.,10m sec., or 1m sec Can select OFF, 100m sec,or 10m sec.
Time stamp OFF, [date, hour, min.], [hour, min. sec.], [min., sec., 10m sec.] OFF, [date, hour, min.],or [hour, min., sec.]
Logic analyzer Features such as 20MHz of sampling, time measurement, trigger, and displaying by zoom-in or out.  
Trigger function Sequential action Single action
Search function Search designated errors, data strings, time stamp value.
Simulation function Manual mode, Flow mode, and Echo mode
BERT function Error rate measurement test in accordance with ITU-T G.821.
Memory card interface Supports the dedicated CF card of 2GB. Supports the dedicated SRAM card of 1MB.
Power supply Nickel-hydrogen battery Nicad battery
Dimensions, Weight 240(W) x 180(D) x 39(H) mm, 940g 240(W) x 170(D) x 39(H) mm, 940g