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Ohaus Corporation
19A Chapin Road
P.O. Box 2033
Pine Brook, NJ 07058-2033
SF42 Impact Printer
Instruction Manual
Impresora de Impacto SF42
Manual de Instrucciones
Imprimante à impact SF42
Mode demploi
Streifendrucker SF42
Bedienungsanleitung
Stampante ad impatto SF42
Manuale distruzioni
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Ohaus Corporation, 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ, 07058-2033
, USA
Declaration of Conformity We, Ohaus Corporation, declare under our sole responsibility that the printer
model listed below marked with CE - is in conformity with the directives and standards mentioned.
Printer model SF42
Marked with: EC Directive (Including applicable amendments) Standard
73/23/EC EN60950 (VDE 805)
Electrical equipment for use within specified voltage limits Safety requirements for Electrical Components
89/336/EC EN61326
Electromagnetic compatibility EMC Emissions, residential, commercial and light industry.
EN61326:1997 A1:1998 (minimal requirements)
EMC Immunity: Minimum test requirements.
EN61000-3-2:1995 + A1:1998 + A2: 1998; EN61000-33:1995
EMC Part 3 (for equipment rated input current < or=16A)
Limits- Section 2: Limits for harmonic current emissions
Limits- section 3: Limitation of voltage fluctuations and flicker
in low voltage supply systems
Last two digits of the year in which the CE marking was affixed: 01
Additional Standards
CAN/CSA-C22.2 No. 950; UL Std. No. 1950
Safety requirements for Electrical Equip. for measurement, Control and Laboratory Use, Part 1; General Requirements
FCC FCC, Part 15, class B Emission
ISO 9001 Registration for Ohaus Corporation.
Ohaus Corporation, USA, was examined and
evaluated in 1994 by the Bureau Veritas Quality International, BVQI, and was awarded ISO 9001 registration. This certifies that Ohaus Corporation, USA, has a quality system that conforms with the international
standards for quality management and quality assurance (ISO 9000 series). Repeat audits are carried out
by BVQI at intervals to check that the quality system is operated in the proper manner.
Ohaus Corporation, Pine Brook, NJn
NOTE:
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
Unauthorized changes or modifications to this equipment are not permitted.
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TABLE OF CONTENTS
INTRODUCTION ........................................................................................................ 4
DESCRIPTION .......................................................................................................... 4
UNPACKING ............................................................................................................ 4
INSTALLATION ......................................................................................................... 4
Environment .......................................................................................................... 4
Controls ................................................................................................................ 4
Serial Interface Connection ...................................................................................... 5
Installing the Ribbon Cassette .................................................................................. 5
Power Connections ................................................................................................. 6
Loading the Paper Roll ............................................................................................ 6
OPERATION
Indicators and Key Button Operation ......................................................................... 6
Self-Test Mode ....................................................................................................... 6
On/Off Line Mode.................................................................................................... 7
Paper Feed Mode .................................................................................................... 7
Setting the Serial Interface ........................................................................................ 7
Setting Baud Rate .................................................................................................. 7
Setting Parity ......................................................................................................... 8
Setting Data Length ................................................................................................ 8
CARE AND MAINTENANCE ........................................................................................ 8
SERVICE INFORMATION ............................................................................................ 8
SPECIFICATIONS ..................................................................................................... 9
PARTS INFORMATION............................................................................................... 9
REPLACEMENT PARTS ............................................................................................. 9
ACCESSORIES ........................................................................................................ 9
APPENDIX A NOISE FILTER ..................................................................................... 10
APPENDIX B WATCH-DOG FUNCTION ....................................................................... 10
LIMITED WARRANTY .............................................................................................. 10
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INTRODUCTION
This manual covers installation and operation for the Ohaus Model SF42 lmpact Printer. To ensure
proper operation of the printer, please read this manual completely.
DESCRIPTION
The Ohaus Model SF42 Impact Printer, is a dot-matrix microprinter which can interface directly
to various Ohaus Balances which contain an RS232 lnterface connector. The printer interface is
serial, RS232 compatible. There are two LED lamps, Power and SEL indicators, and two push
button switches, SEL select on/off line and LF line feed switch. The printer utilizes an impact dot
matrix head in a 5 x 7 format with 42 characters per line, and can print 40 lines per minute. Printing
paper width is 2.25 /5.7cm. Power is supplied through an AC Power Adapter which is included.
UNPACKING
Your SF42 was shipped with the following items:
• AC power adapter
• Instruction manual
• A paper roll and a ribbon are loaded inside the printer before packing.
It is recommended to save the carton and packing material for storing, transporting the printer or
returning it for service.
INSTALLATION
Environment
The printer should always be used in an environment which is free from corrosives, vibration, and
temperature or humidity extremes.
This product is intended for professional measurement & test use.
Controls
The controls, indicators and connectors of the model SF42 impact printer are shown in Figure 1.
REMOVABLE
COVER
PAPER OUT SLOT
SEL INDICATOR
LOWER CASE
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POWER INDICATOR
SEL BUTTON
Figure 1. SF42 Printer Controls.
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FEED BUTTON
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Serial Interface Connection
The 25 pin connector is located on the back of the printer. The serial interface is standard RS232C
compatible.
TABLE1. SERIAL INTERFACE
Pin No. Signal Source Description
2 TXD Printer Printer sends control code XON/OFF to host when using handshak-
ing of XON/XOFF.
3 RXD Host Printer receives data from host computer.
4 RTS Printer Signal sets "MARK" state to indicate the printer is BUSY and cannot
receive data. However, it sets "SPACE" state to indicate the printer
is READY and can accept data.
7 GND ... Signal ground.
NOTE: "Source" represents signal source.
Installing the Ribbon Cassette
The ribbon cassette has been installed at the factory.
When the ribbon has to be replaced after use, install
the ribbon as follows:
1. Open the cover as shown in Figure 2.
2. Remove the used ribbon cassette from the
printer as shown in Figure 3.
3. Install a new ribbon cassette as follows:
Put the left end slightly on the axle of the gear
that is on the left side of the printer mechanism.
Meanwhile, keep the right end little higher than
the left.
If the left end is not seated to the axle completely, press the knob of the cassette and
turn it slowly clockwise as shown by the
arrow.
Figure 2. Printer with Cover Opened.
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4. After the left end of the cassette is in place, (fully
seated) press the right end of the cassette.
Now, check that the ribbon is tight and on the
inside of the cassette. Turn the knob clockwise
again until the ribbon is on the outside of the
cassette.
5. Close the cover of the printer.
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Figure 3. Removing Cassette Ribbon.
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Power Connections
The SF42 Printer uses an external power adapter that
supplies 9V dc rated at 600mA. The polarity in the
connector is shown in Figure 4. Connect the power
adapter to the printer and a suitable power source.
Figure 4. Polarity of the Power Connector.
Loading the Paper Roll
The SF42 Printer has a paper roll loaded at the factory, however, the paper end is not positioned
in the paper entry slot. The reason is to protect the printer and ribbon from damage during shipping
and storage periods. Before using the printer, load the
paper as follows:
1. Open the cover on the printer as shown in
Figure 2.
2. Cut the end of the paper into the following shape
as shown in Figure 5.
3. Connect the Power Adapter to the printer and
plug it into a suitable power source.
4. The SEL (SELect) button is an ON/OFF toggle.
Press it to OFF. The SEL indicator is off.
5. Press and hold FEED button to feed the paper into the paper entry slot. The paper will
gradually come out from the paper exit on the top of the printing mechanism. Wait a moment
for a little bit of paper to appear, then release the FEED button to stop the paper feed.
6. Pull the paper end passing through the slot on the cover of the printer and close the cover.
Figure 5. Cutting the Paper Roll.
OPERATION
Indicators and Key Button Operation
There are two indicators and two key buttons on the
panel of the SF42 Printer. The "P" indicator is used
for power indication and the "SEL" indicator is used
for On/Off Line indication.
One key button marked "SEL" is used to provide On/
Off line selection. The FEED key button is used to advance the paper feed when pressed.
The P indicator lights up when the power is on. The SEL indicator lights up when the printer enters
On-line mode. Operating the SEL and FEED key buttons can select three working modes such as
Self-Test, On/Off Line and Paper Feed.
P
SEL
Figure 6. Indicators and Buttons.
Self-Test Mode
To start the Self-Test:
Press the SEL button, then power on. The printer enters the Self-Test mode.
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SEL
FEED
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Self-Test Mode (Cont.)
The Self-Test checks the condition of the printer. If the printer prints out the Self-Test sample correctly,
the printer is working normally. It does not indicate that the interface between the printer and the
host is good. If the sample is not correct, the printer needs checking.
The Self-Test lists the model number of the printer, all ANK characters with the order of fonts then
prints out interfacing type and Chinese Fonts. Chinese standard level 1 and Chinese Fonts library.
Printer will enter the On-Line state after it completes the Self-Test operation. Sometimes, the SelfTest is incorrect but the printer may be actually normal. Under that condition, please check if or
not the power supply meets the specification of the printer.
On/Off Line Mode
When power is on or after the printer quits from Self-Test, the printer enters the On Line state. At
the same time, the SEL indicator lights up. Click the SEL button to Off Line then the SEL indicator
goes out. Click the SEL button again to return to ON Line. So the button is ON/off Line toggle. The
printer does not receive the data from the host computer when Off Line.
Another function is that SEL button can halt the printing operation. You can click the SEL button at
printing state. The printer prints out the last line and halts in the state of Off Line. Clicking the SEL
button, the printer will continue to print.
Paper Feed Mode
When Off Line, clicking the FEED button feeds the paper out.
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Setting the Serial Interface
(1) Setting the parameters of data communication. Skip to step (2) if you do not need to modify
the parameters.
Setting Baud Rate
1. Hold the FEED button down and power on, to enter the serial communication settings.
2. Release the FEED button. The current Baud Rate will be printed.
3. Click the SEL button to select the Baud Rate. Each click will advance the setting which is printed
as either: 1200, 2400, 4800 or 9600 bps.
4. After the Baud rate has been selected, click the FEED button to confirm the value. Follow with
Parity settings.
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Setting Parity
1. Click the SEL button to select Parity, each click will advance the setting which is printed as
either: None, Odd, Even.
2. Click the FEED button to confirm the value of Parity.
Setting Data Length
1. Click the SEL button to select Data Length, each click will advance the setting which is printed
as either: 8 bits or 7 bits.
2. Click the FEED button to confirm the value of Data Length. Printer returns to Baud Rate setting
again.
3. Clicking the SEL button again can repeat all settings. Switching off the power will quit the
parameter setting.
(2) Printer sets the RTS line to MARK that means BUSY and meanwhile, sends the code X-OFF
(13H) out if the space in the data buffer of the printer is less than or equal to 32 bytes. Printer
sets the RTS line to SPACE that means READY and meanwhile, sends the code X-ON (11H)
out if the buffer space is more than 32 bytes.
(3) Host computer identifies the status of printer if it is in the READY or the BUSY according to
X-ON/X-OFF or RTS/CTS protocol. The host is based on the status to send a Start or Stop
transmitting string to the printer.
CARE AND MAINTENANCE
To keep the Printer operating properly, the housing should be kept clean and free from foreign
material. The following maintenance procedures and precautions should be followed:
1. Do not dismantle the printer head,
2. Do not leave power on when not in use for a long period.
3. Switch off, if printer does not not work normally.
4. Power supply must match the AC Adapter power requirements.
5. Do not lubricate the printer head.
6. Fluff and dust from paper are harmful to the printer head. Check and clear the head
when replacing the paper roll.
7. When replacing the ribbon, do not press the cassette too hard, otherwise, the
plastic wheel may be damaged.
8. Never use ribbon oil, it may damage the printer head.
SERVICE INFORMATION
If you cannot resolve problems with the printer, you will need to contact an authorized Ohaus Service
Agent. For Service assistance in the United States, please call Ohaus Corporation toll-free at (800)
526-0659. An Ohaus Product Service Specialist will be available to help you.
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SPECIFICATIONS
MODEL SF42 Impact Printer
General Specifications:
Interface: Serial (RS232 Compatible)
Printer Method: Impact Dot Matrix (Inked Ribbon)
Character Format: 5 x 7 Dot Matrix
Character Dimension: (in/cm) 0.04 x 0.10/.11 x .26
Character Density: 42 Characters per line
Printing Speed: 40 lines per minute
Paper Width: (in/cm) 2.25/5.7
Power Adapter: AC adapter (110/120, 220/240 Vac) 50/60Hz
Power: 9 V dc, 600mA, (center pin positive)
Operating Temp. 32°to 104F°/0°C to 40°C
Dimensions: (in/cm) (WxHxD) 4 x 3.7 x 7.3 / 10.4 x 9.6 x 18.6
Weight (lb/kg) 1.3 / 0.59 (without internal paper roll)
Interface Specifications:
Connector: 25 Pin D type (Female)
Baud Rate: Selectable (1200, 2400, 4800, 9600)
Data Bit: 7 or 8
Parity: Even, odd or none
Stop Bit: Auto select
PARTS INFORMATION
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If you require replacement parts or would like to purchase accessories, please call Ohaus
Corporation. An Ohaus Product Parts Specialist will be available to help you.
REPLACEMENT PARTS
Description OHAUS Part No.
AC Adapter:
120 V ac, 60Hz, Output, 9V/1A, USA (CUL) 12101501
230 V ac, 50Hz, Output, 9V/1A, Europe (CE or TUV/GS) 12101502
240 V ac, 50Hz, Output, 9V/1A, UK (CE or TUV/GS) 12101503
110 V ac, 50Hz, Output, 9V/1A, Japan (UL) 12101504
240 V ac, 50Hz, Output, 9V/1A, Australia (CE or TUV/GS) 12101505
Paper (5 pack): 12101511
Ribbon: 12101512
ACCESSORIES
Interface Cables: Contact Ohaus Customer Service or visit Ohaus web page at www. ohaus.com
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Appendix A Noise Filter
For the reason that the EMC standard is required in
many countries or districts in the world, the noise
filter, for this requirement should be installed onto the
cable that is used for connection of the parallel or
serial interface of the SF42 printer. The cable must
be prepared according to the following steps:
1. Select the shielded cable for the printer connection.
2. Bend the cable and make its shape into a ring
as shown in Figure A-1.
3. Open the noise filter and clamp it onto the ring.
At the same time, reserve the 2 cm long cable
between the filter and the D-type plug which will
be connected to the printer interface. See Figure
A-1 for details.
Figure A-1. Noise Filter Installation.
Appendix B Watch-dog Function
The Watch-dog circuit is already installed in the SF42 Printer. It effectively improves the antiinterference performance of the printer.
If the printer were interferred by ESD, BURST and RF sources, it would enter into an abnormal state.
If the printer remains in the abnormal state exceeding the watch-dog timing, the printer would be
restarted or reset automatically.
The result is the same as reset when power is is on, i.e. the receiving buffer of the printer will be
cleared and all the command parameters wil be set to the default values. The printer enters in the
normal operating mode.
LIMITED WARRANTY
Ohaus products are warranted against defects in materials and workmanship from the date of
delivery through the duration of the warranty period. During the warranty period Ohaus will repair,
or, at its option, replace any component(s) that proves to be defective at no charge, provided that
the product is returned, freight prepaid, to Ohaus.
This warranty does not apply if the product has been damaged by accident or misuse, exposed
to radioactive or corrosive materials, has foreign material penetrating to the inside of the
product, or as a result of service or modification by other than Ohaus. In lieu of a properly
returned warranty registration card, the warranty period shall begin on the date of shipment to
the authorized dealer. No other express or implied warranty is given by Ohaus Corporation.
Ohaus Corporation shall not be liable for any consequential damages.
As warranty legislation differs from state to state and country to country, please contact Ohaus
or your local Ohaus dealer for further details.
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