Unipulse M525B User manual

Introduction
I
Introduction
I
Introduction
Thank you for purchasing our intelligent printer M252B.
This product is to be used by connecting it to our loadcell indicators or digital indicators through the SI/F
(two-wire serial interface). External equipment data other than our indicators can also be printed by adding
optional BCD input or RS-232C interface.
Read this manual and understand the descriptions carefully before use.
After reading the manual, always keep it handy so that it can be referred to at any time.
Safety Precautions
Installation, maintenance and inspection of the M252B should be performed by personnel having technical
knowledge of electricity. In order to have an M252B weighing controller used safely, notes we would like
you to surely follow divide into " " and " ", and are indicated by the following
documents.Notes indicated here are the serious contents related safely. Please use after understanding the
contents well.
For safety reasons, please read the following safety precautions thoroughly.
WARNING
This sign forewarns the presence of hazards that could result in serious injury or
fatality when incorrectly handled.
CAUTION
This sign forewarns the presence of hazards that could result in personnel injury or
property damage when incorrectly handled.
WARNING
CAUTION

WARNING
II
WARNING
II
WARNING
●For the entire system to function safely when the M252B becomes faulty or malfunctions,
provide a safety circuit outside the M252B.
●Before using the M252B as described below, make sure to consult with our sales personnel.
- Use in environments not described in the operation manual.
- Use greatly impacting human lives and assets, such as medical devices, transport devices
entertainment devices, and safety devices.
● Do not disassemble, repair, or modify the M252B. Doing so may cause a fire or an electric shock.
●Do not install in the following environments.
- Places containing corrosive gas or flammable gas.
- Where the product may be splashed with water, oil or chemicals.
●Do not connect a commercial power source directly to the signal input/output terminals.
●Be sure to use crimp contacts for connection to terminal blocks, and never connect bare wires.
●Be sure to ground the protective ground terminal.
●The attached AC cable is designed for domestic use in Japan, and its rating is 125V AC,
10A. If you are preparing the cable, use a cable with higher specification than the attached
cable for connection.
●Before performing the following, make sure that no power is applied.
- Attachment/detachment of connectors of options, etc.
- Wiring/connection of cables to the signal input/output terminals.
- Connection to the ground terminal.
●For connection to the signal input/output terminals, check the signal names and pin
assignment numbers, and then carry out wiring properly.
●After wiring, be sure to mount the attached terminal board cover. Otherwise, it may cause an
electric shock.
●Before applying power, carefully check the wiring, etc.
●Use a power supply voltage and load within the specified and rated ranges.
●Do not damage the power cord. Doing so may cause fire or electric shocks.
●If the cover of the main body is opened, it may cause an electric shock internally. Even if the
power is off, the internal capacitor is charged. Contact us for internal inspection or repair.
●Do not touch any signal input/output terminal while applying power. Doing so may cause
electric shocks or malfunctions.
This sign forewarns the presence of hazards
that could result in serious injury or fatality
when incorrectly handled.
Warning on design
Warning on installation
Warning on wiring
Warning during startup and maintenance

WARNING
III
WARNING
III
WARNING
●In the case of smoke, an abnormal smell or strange sound, immediately turn off the power,
and disconnect the power cable.
●Never disassemble, deform under pressure or throw the battery into fire.The battery may
explode, catch fire or leak.
- Battery Model: CR14250SE made by SANYO Electric Co., Ltd.
Nominal voltage: 3V
Nominal electric capacity: 850mAh
CAUTION
●Do not install in the following environments.
- Where the temperature/humidity exceeds the range of the specifications.
- Outdoors, or where the altitude exceeds 2000m.
- Places exposed to direct sunlight
- Dusty places
- Poor-ventilated places
- Places containing large quantities of salt or iron powder.
- Where the main body is directly affected by vibrations or shocks.
- Where the temperature changes remarkably or there is a danger of freezing or condensing.
●Take adequate shielding measures when using at the following locations.
- Near a power line.
- Where a strong electric field or magnetic field is formed.
- Where static electricity, relay noise or the like is generated.
●Install the M252B as far away from devices generating high frequency, high voltage, large
current, surge, etc., as possible. Also, carry out wiring separately from their power lines. Do
not carry out parallel wiring and common wiring.
●Do not use it, broken down.
●Tighten the screws for the power input terminal at the specified torque.
If they are loose, shorts, fire or malfunctions may occur.
Tightening torque: 0.5N•m
●For sensors, external inputs/outputs and options, use shielded cables.
This sign forewarns the presence of hazards
that could result in serious injury or fatality
when incorrectly handled.
Warning during startup and maintenance
This sign forewarns the presence of hazards
that could result in personnel injury or property
damage when incorrectly handled.
Caution on installation
Caution on wiring

CAUTION
IV
CAUTION
IV
CAUTION
●For turning on/off the power, be sure to keep intervals of 5 seconds or more.
●After power-on, make sure to warm up the M252B for at least 30 minutes or more before use.
●If the M252B is not used by the specified method, its protective performance may be
impaired.
●Maintenance
- When performing maintenance, disconnect the power.
- Do not wipe with a wet rag, or with benzine, thinner, alcohol, etc. Doing so may cause
discoloration or deformation of the M252B. In the case of heavy contamination, wipe off
the contamination with a cloth after dipping it into a diluted neutral detergent and wringing
it well, and then wipe with a soft, dry cloth.
●Do not open the front cover with the power on when replacing the ribbon cassette, etc. The
printer may start sudden movement, and you may injure yourself.
●Do not drop foreign objects such as screws inside the printer. If an object is dropped,
immediately turn off the power, and completely remove the foreign object before using the
printer.
●Do not touch the print head immediately after printing because the print head is hot.
●Never print without paper or a ribbon cassette. Also, do not print out of the paper width.
●Be sure to use a specified ribbon cassette. Use of an unspecified one will cause a failure.
●If the print is light or the ink ribbon is ragged, replace the ribbon cassette. If the ribbon
cassette is left for a long time in an unpacked condition, its life will shorter.
●After replacing the ribbon cassette, check that the ink ribbon is not slack. If slack, turn the
knob in the direction of the arrow to remove the slack before operation.
●Use paper appropriate to the specifications.
●When the M252B is shipped, spacers made of corrugated cardboard are used as cushioning
materials.
Though it is factory-designed so that shocks can sufficiently be absorbed, breakage may
result if shocks are applied when the spacers are reused for transportation. If you send the
M252B to us for repair, etc., take adequate measures against shocks by using polyurethane
materials, etc., separately.
●If you dispose of the product, handle it as industrial waste.
This sign forewarns the presence of hazards
that could result in personnel injury or property
damage when incorrectly handled.
Caution during startup and maintenance
Caution during use
Caution during transportation
Caution during disposal

Features of the M252B
V
Features of the M252B
V
Features of the M252B
■Dot impact mechanism
A 24-digit dot impact type printer mechanism that allows use of copying paper is loaded.
■Sophisticated statistical computing functions
In addition to grand totals and sub totals, maximum, minimum, average, standard deviation,
histograms, diagrams, etc., can be printed.
■Economical double print
Thanks to the double printing function by which data from two indicators can be printed and added,
statistical computations of a double measuring machine having two measuring heads can be performed
by one unit.
■Histograms and diagrams convenient for quality control
Variations in data can be understood visually.
■Simple setting in an interactive manner
Setting operation is simple in an interactive manner that requires input of set values according to
guidance from the M252B.
■Code classification
Print data assigned codes (within 6 characters for numerical values and katakana) can be classified and
added on a code-by-code basis (32 types at the maximum of each ch).
■Convenient free power supply
100V to 240V AC is acceptable.
■Perfect data backup
All set values and other data are stored in a nonvolatile memory and lithium-battery-backed-up
memory, respectively.
■Selectable interface
A 2-ch SI/F is equipped as standard. BCD input and RS-232C interface are optionally available. (Only
1ch of either a BCD or RS-232C option can be connected.)

Contents
VI
Contents
VI
Contents
1 OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1. Contents of The Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-2. About Connectable Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-3. Appearance Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
■Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
■Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 PRINTER PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2-1. Installing a Ribbon Cassette. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2-2. Power Input Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2-3. Protective Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2-4. Installing Roll Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 CONNECTING WITH INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3-1. SI/F (Two-Wire Serial Interface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
■About the SI/F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
■About the SI/F of the M252B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3-2. SI/F Interface, External Input Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3-3. Try to Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3-4. About Input ch's . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3-5. Print Data Input ch's and Alarm Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 FOR GREATER USE OF THE PRINTER . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4-1. Basics of Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
■Mode Configuration of The M252B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
■Setting Method of The M252B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
■Basic Operation of Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4-2. Details of Each Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
01: Date/Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
02: Print Data Selection Ach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
03: Print Data Selection Bch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
04: Unit Selection Ach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
05: Unit Selection Bch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
06: Print Every ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
07: Print Every Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
08: Automatic Print ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
09: Interval Print ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10: Interval Seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11: GT/ST Print Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Contents
VII
Contents
VII
12: Types of Sub Totals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
14,16: Histogram Range Ach/Bch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
17: Standard Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
18: Data Adding ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
19: PRINT Key ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
20: Batch Total ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
21: Feed Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
22: Code Selection Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
23: Number of Code Digits Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
24: Code Table Registration Ach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
25: Code Table Registration Bch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
26: Data Check ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5 OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5-1. BCD Input (Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5-2. BCD Input Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
41: BCD Decimal Point Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
42: BCD Data Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
43: BCD Minus Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
44: BCD Over Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
45: BCD Strobe Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5-3. RS-232C Interface (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5-4. RS-232C Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
46: RS-232C Transmission Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
47: RS-232C Parity Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
48: RS-232C Data/Stop Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
49: RS-232C Terminator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
50: RS-232C Answer Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5-5. Communications Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6 ADVANCED USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6-1. Classification by Code Name and Code Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
■Code Name Registration Performance with Front Panel Keys . . . . . . . . . . . . . . 46
■Code Table - Difference from Code Names -. . . . . . . . . . . . . . . . . . . . . . . . . . . 48
■Code Table Registration Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
■How to Designate a Code Name/Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6-2. Maintenance Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
■Method for Operating the Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
1: Test Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2: Sample Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3: Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4: Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5: Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6-3. Over Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
■Over Status (R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
■Range Over (U/L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6-4. Delete Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
6-5. Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Contents
VIII
Contents
VIII
6-6. ROM Version Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
6-7. Date Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7-1. Classification of Trouble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7-2. The Printer Does not Operate Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7-3. The Printer Does not Function Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
7-4. Others. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8 SUPPLEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8-1. Setting Mode List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8-2. Option Setting Mode List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8-3. Maintenance Mode List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8-4. List of Unit Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8-5. Character Input Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8-6. List of Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8-7. Introduction of Consumables and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8-8. Product Specifications of the M252B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
■Printer Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
■Setting Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
■Main Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
■External Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
■Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
■General Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
8-9. Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

1
1 OUTLINE
1
OUTLINE
Chapter
1
1-1. Contents of The Package
The packaging box contains the following.
Be sure to check them before use.
1OUTLINE
M252B body・・・1 M252B operation manual・・・1
AC input cord・・・1 Mini screwdriver・・・1
(with solderless terminal)
Roll paper・・・1
Connector for BCD parallel data output・・・1
[with BCD parallel data input option]
Ribbon cassette・・・2
(One is already installed.)
Roll paper installing bar・・・1
About the AC input cord
- The AC input cord attached to this product as standard equipment can be used
in the AC100V power supply in Japan. (Official ratings voltage AC125V)
Please use the AC input cord authorized in the country when you use this
product outside Japan.
- Our company sells following resistance pressure cable AC250V (European
standard product) separately.
Please purchase it from us when you need after confirming its plug shape/volt-
age.
CAAC3P-CEE7/7-B2 :
CEE7/7 Plug cable (2m)
Point

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Chapter
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1-2. About Connectable Devices
1-3. Appearance Description
■Front Panel
1. Front panel keys
Press when operating and setting the M252B.
2. Push panel
Open when setting paper or installing a ribbon cassette for the M252B. It pops out approx. 3cm
forward when pushing the center of the panel until you hear it click.
3. Paper ejection slot
Printed roll paper is ejected from this slot with print on it.
1. Front panel keys
2. Push panel
3. Paper ejection slot
4. Flip panel
5. Paper cutter
6. Power lamp
The push panel is open.

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4. Flip panel
The part below the push panel can be opened frontward. Open when installing a ribbon cassette.
5. Paper cutter
Use when cutting roll paper ejected from the paper ejection slot. The cutter is attached to the upper
side of the ejection slot.
6. Power lamp
The green lamp lights when the power of the M252B is on.
■Front Panel Key
How to designate a key and its function (print mode)
Key (how to designate) Description
1. Enters the code input (selection) mode of Ach.
2. Enters the code input (selection) mode of Bch.
3. Prints date.
4. Starts interval print.
5. Stops interval print.
6. Prints sub totals.
7. Prints grand totals. The grand totals and printed counts are cleared,
and become 0.
8. The last printed data is printed again, and is deleted from the target
of the grand totals (sub totals).
9. Enters the setting mode.
10. Prints the current value.
11. Feeds paper by one line.
12345678
91011
12
(Code A)
(Code B)
(Date)
(Start)
(Stop)
(ST)
(GT)
(Del)
(Function)
(Print)
(Feed)

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Chapter
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■Rear Panel
1. Input terminal block
Connect various kinds of inputs.
2. AC power source input terminal block
Connect with AC power source cable supplied.
AC voltage is 100V to 240V(+10%, -15%) AC frequency is 50Hz/60Hz.
How to designate a key and its function (setting mode)
Key (how to designate) Description
6. Inputs a hyphen.
7. Inputs a space.
8. Goes to the next input position.
10. Cancels an input value or set value.
11. Accepts an input value or set value.
12. Use for inputting numbers, alphabet and katakana.
(Hyphen)
(SP)
(No mark)
(Escape)
(Enter)
(Numerical keys)～
For character input in code/code table registration, see "■Code Name
Registration Performance with Front Panel Keys" on page 46, and "■Code Table
Registration Performance" on page 48.
Point
1. Input terminal block
2. AC power source
3. Option space
4. Frame ground (F.G.)
5. Protective ground
input terminal block

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3. Option space
Install an option to expand the functions of the M252B. Either BCD input or RS-232C interface can
be installed optionally.
4. Frame ground (F.G.)
F.G. of the AC input terminal. (There is continuity between the casing and F.G. terminal.)
5. Protective ground
This is a protective ground terminal. Make sure to ground the protective ground terminal to prevent
shock hazards and electrostatic hazards. (The casing and protective ground terminal are in
conduction.)
■Input Terminal Block
Name Description
(1) COM Common terminal of the external input terminal block.
(2) FEED Feeds when short-circuited with the COM terminal.
(3) PRINT Prints when short-circuited with the COM terminal.
(4) ST Prints sub totals when short-circuited with the COM terminal.
(5) GT Prints grand totals when short-circuited with the COM terminal.
(6) (7) SI/F Ach Input terminal for the SI/F (Ach).
(8) (9) SI/F Bch Input terminal for the SI/F (Bch).
(1) COM
(2) FEED
(3) PRINT
(4) ST
(5) GT
(6)(7) SI/F Ach
(8)(9) SI/F Bch
Point
PRINT/FEED/ST/GT
OFF
ON
MIN.30ms MIN.60ms
The following shows a timing diagram of the external input terminals on the panel.

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Chapter
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Input equivalent circuit
A signal is inputted to the signal input circuit by short-circuiting or opening the
input terminal and the COM terminal. Short-circuiting is effected by means of a
contact (such as a relay or a switch) or a noncontact (such as a transistor or an
open-collector TTL).
relay
TTL open collector
output
＊
Open OFF
Short ON
Vcc ←inside
Approx.
COM
push
switch
+5V
1
outside →
M252B
IN
Short-circuited when IN is ‘H’
toggle
switch
transistor
IN
Ic=6mA
Point

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2 PRINTER PREPARATIONS
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PRINTER PREPARATIONS
Chapter
2
2-1. Installing a Ribbon Cassette
Use the PR350/10 (optional accessories) ribbon cassette.
Two ribbon cassette are attached (One ribbon cassette has already been installed at the time of delivery.).
1. Push the center of the push panel with your finger until you hear it click. The push
panel pops out forward. And draw out the push panel.
2PRINTER PREPARATIONS
- Do not open the front cover with the power
on when replacing the ribbon cassette, etc.
The printer may start sudden movement,
and you may injure yourself.
- Do not drop foreign objects such as
screws inside the printer. If an object is
dropped, immediately turn off the power,
and completely remove the foreign object
before using the printer.
- Do not touch the print head immediately
after printing because the print head is
hot.
Attention

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2 PRINTER PREPARATIONS
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Chapter
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2. Open the flip panel downward. Catch the upper left of the installed ribbon cassette
with your finger (with your fingernail), and pull and remove it frontward.
3. Install a new ribbon cassette, being careful about its orientation.
Turn the ribbon cassette upside down (in the direction that reverses the PULL
marking as shown below), and push it in until you hear it click. Then close the flip
panel, and push in the push panel firmly until you hear it click.
2-2. Power Input Connection
For connection to terminal blocks, use cables with crimp contacts (M3) as shown in the illustration
without unbraiding their ends.
Connect the AC power cord. The input voltage is 100V - 240V AC. The frequency is 50/60Hz.
1. Check that no power is applied.
2. Remove the terminal block cover.
3. Remove the screws (three) from the
terminal block. Fit the crimp contacts
(M3) to the screw holes, and fix them
with the screws.
4. Install the terminal block cover, and fix it
with the screws.
* A parallel two-core power cable with crimp contacts is attached to the product.
AC IN
F.G.
Within 6mm
LN
F.G.
(Functional ground)

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2 PRINTER PREPARATIONS
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2-3. Protective Ground Connection
The grounding terminal is for prevention of electric shocks and failures caused by static electricity.
Use an approx. 0.75mm2thick wire, and be sure to ground
2-4. Installing Roll Paper
No roll paper has been installed at the time of delivery. Referring to the following procedures,
install roll paper.
1. Push the center of the push panel with your finger until you hear it click.
The push panel pops out forward. And draw out the push panel.
2. Insert the roll paper installing bar into roll paper.
Direct the paper winding direction as shown in
the illustration, and set it to the bearing.
WARNING
- Connect with no power applied because it may cause an electric shock.
- The attached AC cable is designed for domestic use in Japan, and its rating is 125V
AC, 10A. For use at voltages exceeding the rating and for overseas use, have a
separate AC cable prepared.
- Since the M252B has no power switch, install a breaker.
- Be sure to ground the protective ground terminal to prevent electric shocks and
injury by static electricity.
(There is continuity between the casing and protective ground terminal.)
Do not use other screws than those installed to the body.

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2 PRINTER PREPARATIONS
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PRINTER PREPARATIONS
Chapter
2
3. Pass the end of the roll paper under the guide bar at the lower part of the flip panel,
and insert it between the guide bar and guide.
Press the (FEED) key with the paper inserted, and release the key when the
paper comes out of the paper ejection slot.
4. Remove the flexure of the roll paper, and push in the push panel firmly until you
hear it click.
Enlarged section
←Front Guide bar
Roll paper
It may cause some trouble if you pull the paper fast or backward when the paper
jam occurred during the paper setting.
Please pull the paper in the direction of the arrow A slowly and straight to remove
it after stopping the paper feed.
Cut the power then on again when it doesn't return normally after removing the
paper.
A
Attention

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3 CONNECTING WITH INDICATORS
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CONNECTING WITH INDICATORS
Chapter
3
3-1. SI/F (Two-Wire Serial Interface)
The M252B is equipped with a SI/F interface to connect it with UNIPULSE-manufactured digital
indicators or load cell indicators as standard. In this chapter, connection with indicators through the
SI/F is explained.
■About the SI/F
The UNIPULSE's original SI/F is an interface to connect our F series indicators and printer, or
peripheral equipment, such as an external display. SI/F-compatible products can simply be
connected and used without a wareness of data content and the hardware specifications.
Specifications of the SI/F
Connection Two-wire, nonpolar
Transmission distance Parallel two-core cable: 30m
Shielded cable: 300m
Transmission data Measuring/metering data, status information (result of comparison, MD,
zero alarm, etc.), error information, automatic print command, etc.
Signal standards Signal level: Photocoupler-isolated current signal
Transmission system: Start/stop synchronous system
Transmission speed: 600bps
Data bit: 8bit
Start bit: 1bit
Stop bit: 1bit
Parity: ODD
■About the SI/F of the M252B
The M252B is equipped with a 2-ch SI/F (Ach and Bch). 6-7PIN and 8-9PIN on the rear terminal
block correspond to Ach and Bch, respectively.
3 CONNECTING WITH INDICATORS