Page 1
Rice Lake Digital Chair Scale
Model 550-10
Software Revision 11454
Technical Manual
155191 - Rev C
Page 2
Page 3
Contents
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.
1.0 Introduction.................................................................................................................................. 1
2.0 Cautions and Warnings................................................................................................................ 2
3.0 Scale Assembly ........................................................................................................................... 3
3.1 Unpacking Your Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2 Save Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.3 Setting Up Your Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.0 Scale Operation ........................................................................................................................... 9
4.1 Weighing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Hold/Release Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Preset Tare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4 Toggle Tare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5 Using the Body Mass Index (BMI) Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.0 Scale Configuration ................................................................................................................... 12
5.1 Programming Mode Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Default Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3 Scale Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.0 Test Menu................................................................................................................................... 18
7.0 RS-232 Communication............................................................................................................. 19
7.1 Pushbutton Keypad Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2 Communication Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2.1 Escape Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2.2 Maintenance Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 USB Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.0 Troubleshooting and Testing ..................................................................................................... 25
9.0 Maintenance .............................................................................................................................. 25
9.1 Basic Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10.0 Rice Lake Chair Scale Specifications....................................................................................... 26
For More Information ............................................................................................................................. 27
Rice Lake Digital Chair Scale Limited Warranty................................................................................... 28
© 2014 Rice Lake Weighing Systems. All rights reserved. Specifications subject to change without notice.
Printed in the United States of America. Software revision 114154
September 2014 Rev. C
Page 4
ii Rice Lake 550 Chair Scale Technical Manual
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars.
Page 5
1.0 Introduction
The Rice Lake 550 Digital Chair Scale is efficiently designed to provide accurate, reliable and repeatable weight
measurements and has features that enable a fast and convenient weighing process. The Rice Lake 550 Digital
Chair Scale features an ergonomic design, has two armrests that can be lifted separately and a foot rest that can
be folded. Its four swivel casters can be locked in place.
This manual can be viewed and downloaded from the Rice Lake Weighing Systems web site at
www.ricelakehealth.com. Technical information on these products and other medical products are
available on the Rice Lake W
eighing Systems web site.
Figure 1-1. Rice Lake 550 Digital Chair Scale
1
Rice Lake 550 Digital Chair Scale Technical
Page 6
2.0 Safety
WARNING
CAUTION
WARNING
Important
With the Rice Lake 550 Digital Chair scale there are certain precautions that should be taken to prevent personal
injury to the user and damage to your scale.
2.1 Safety Signals
Safety Signal Definitions:
Indicates a potentially hazardous situation that, if not avoided, may result in death or serious injury
Indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate injury.
Indicates information about procedures that, if not observed, could result in damage to equipment.
2.2 Safety Precautions
Do not operate or work on this equipment unless you have read and understand instructions in the
manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact
any Rice Lake Weighing Systems dealer for replacement manuals. Proper care is your responsibility.
Before attempting to operate this unit, make sure every individual who operates or works with this unit
has read and understands the following safety information. Plea
se follow these instructions carefully.
• Do not transport the scale while the platform is loaded.
• Always lock the caster brakes of the chair before seating the patient.
• Make sure the footrest is in the up position when seating t
he patient.
• Do not drop the scale or subject it to violent shocks.
• For accurate weighing, the scale must be placed on a flat, stable surface.
• For accurate weighing, verify proper operation according to the procedure
described in this manual
before each use.
• Weight exceeding the maximum capacity (660 Lb/300
Kg) may damage your scale.
• Do not use in the presence of flammable materials.
• Operating at other voltages and frequencies
than specified could damage the equipment. Use only
medically approved AC adapters.
• If the “
LO Bat” indicator activates, for accurate weighing, replace the batteries or connect the scale to an
AC power source as soon as possible.
• These scales are used to determine weight
• To avoid cross contamination, the scale plate must be cleaned regularly
of people while sitting.
. It is recommended after each
weighing which could result in potential contamination such as when there is direct skin contact during
the weighing process.
• The scale is not waterproof so avoid cont
• To prevent injury, do not exert unne
act with excessive moisture.
cessary force on the arm rests.
2 Rice Lake 550 Digital Chair Scale Technical Manual
Page 7
3.0 Scale Assembly
Note
3.1 Unpacking Your Scale
Place the unopened box in an open area that has ample room for unpacking the scale.
Parts contained in the shipping box include:
• The chair scale
• This manual
• Box labeled
•The Parts Inside box contains the following:
• Serial communication cable
• 6 AA batteries
• 5 mm Allen key
• 4 M6 x 16 Allen screws (to attach seat to base)
3.2 Save Packaging
If the Rice Lake 550 Digital Chair Scale must be returned for any reason, it must be properly packed with
sufficient packing materials in the original carton.
Damage caused by improper packaging is not covered by the warranty.
Parts Inside
3.3 Setting Up Your Scale
Use the following steps to set up the Rice Lake 550 Digital Chair Scale.
Move the box into an area where the scale can be assembled. It’
level surface for the most accurate weighments.
1. Locate the operator’s manual from inside the box and set it aside as it
proper scale removal and set up.
Figure 3-1. Chair Scale Packaging Once Out of the Box
2. Locate and remove the “Parts Inside” box and locate the 5 mm Allen key.
s recommended that the scale be placed on a hard,
will provide instructions on the
Rice Lake 550 Digital Chair Scale - Scale Assembly 3
Page 8
3. Remove top Styrofoam and remove the seat from the attached Styrofoam.
Note
Figure 3-2. Remove Seat From Packaging
4. Set the seat aside for later assembly.
5. Remove the side Styrofoam and the back handle Styrofoam.
Figure 3-3. Remove Side Styrofoam From Packaging
6. Take out the scale from remainder of packaging material.
The chair is heavy so use assistance in taking it out of the box and placing it on the floor, making sure it
does not get dropped
.
Figure 3-4. Chair Scale Without Packaging Materials
7. Collect the Styrofoam pieces and place them back in the carton box.
4 Rice Lake 550 Digital Chair Scale Technical Manual
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Chair Assembly
Remove screws to
release the back handle
frame
Tighten screws once
frame has been rotated
Use the following steps to assemble the chair.
1. Use the Allen key provided in the “
2. Release both of the screws holding the back ha
Figure 3-5. Remove Screws to Release the Back Handle Frame
Parts Inside” box.
ndle frame (which is marked with circles in Figure 3-5).
3. Pull out the back handle frame and rotate it so that the indicator will be facing up.
4. Insert the back frame and secure it with the screws.
Figure 3-6. Pull out Frame and Rotate
Figure 3-7. Tighten Screws Once Frame Has Been Rotated and Reinserted
Rice Lake 550 Digital Chair Scale - Scale Assembly 5
Page 10
5. Connect the load cell cable and indicator cable making sure to position the load cell cable on the grooves
Note
so that it doesn’t get damaged or pinched.
Figure 3-8. Connect Load Cell Cable and Indicator Cable
6. Use the Allen key (provided) to release both screws holding the arm rest frame (marked with circles
below).
Figure 3-9. Loosen Screws Holding Arm Rest Frame
7. Rotate the arm rest until the arm rests are parallel to the seat base.
8. Tighten the screws to secure the arm rests in place.
The arm rests can move up and down to allow easy patient access
.
Figure 3-10. Arm Rest Assembly
6 Rice Lake 550 Digital Chair Scale Technical Manual
Page 11
9. Place the seat of the seat base and secure it into place using the four (4) M6 x 16 Allen screws.
Secure seat to scale
using four screws
Bubble level location
Adjust bolt located above
caster to adjust bubble
level
Note
Figure 3-11. Secure Seat to the Scale Using Screws
10. Use level bubble to check for level and adjust feet as needed by adjusting bolts located on top of each
caster wheel.
Figure 3-12. Bubble Indicates that the Scale is Level
Ensure casters are in a locked position prior to having a patient sit down on the chair scale.
Figure 3-13. Brake Location on Each Caster Wheel
11. Foot rest must be in the UP position prior to patient sitting down on the chair scale. Once the patient is
seated, you can lower the foot rest.
Figure 3-14. Flip Footrest Down
Rice Lake 550 Digital Chair Scale - Scale Assembly 7
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Inserting Batteries
Connect the
optional AC
power source
here
RS-232
Connection
The six AA batteries that come with the scale offer an average of 25 hours of continuous use.
To install the batteries,
1. Open the battery chamber cover by loosening the thumbsc
2. Insert batteries into the battery chamber
as shown in Figure 3-15.
Figure 3-15. Battery Chamber
rew.
3. Close the battery chamber.
If an external power supply or USB power supply is connect
ed, the battery flag on the display is turned off.
When using battery or USB power supply, the backlight power is deducted to 60%.
AC Power Connections
Use the optional 120 VAC or 230 VAC adapter when power is available. The optional AC power adapter plugs
into the back of the indicator as shown in Figure 3-16.
.
Figure 3-16. Power Connections
8 Rice Lake 550 Digital Chair Scale Technical Manual
Page 13
4.0 Scale Operation
On/Off
LB/KG
Print
Zero
Hold
Release
BMI
TARE
T
CLEAR
The Rice Lake 550 Digital Chair Scale display has various front panel keys. They are shown below.
Figure 4-1. Rice Lake 550 Digital Chair Scale Front Panel Display Keys
Key Descriptions
Table 4-1 describes each of the Rice Lake 550 Digital Chair Scale’s key functions.
Key Name Function
On/Off Switches the scale on or off
Print
LB/KG
Zero Clears the weight off the scale and returns it back to zero.
Hold
Release
BMI Enables the user to access the BMI (Body Mass Index) function. This key
Ta re Is used to subtract the weight off the scale, ie: oxygen tank, other equipment.
Clear Allows you to return to normal weighing when the BMI value is being
Print - A long key press will send data out from the RS-232 and USB ports.
LB/KG - A short key press allows the user to toggle between kilograms and
ds providing that it’s enabled in configuration mode.
poun
Hold & Release - The first press holds the most current weight value shown
on the display.
A second press releases the weight value shown.
only works if there is a locked weight shown on the display and the BMI
function is turned on in the configuration settings.
displayed.
Table 4-1. Digital Chair Scale Key Functions
Rice Lake 550 Digital Chair Scale - Scale Operation 9
Page 14
ENTER
Note
CAUTION
Note
Key Name Function
ENTER Used to accept height in BMI mode.
Up/Down Arrows Used to adjust height input (0.5 in/0.5 cm) while in BMI mode.
Table 4-1. Digital Chair Scale Key Functions
The keys on the front panel display are very sensitive so only a gentle pushing motion is required to
obtain results.
To prevent injury, do not exert unnecessary force on the arm rests.
The scales have the capability of performing different operations beyond just calculating weight. The various
operating instructions are described below.
4.1 Weighing
Use the following steps to weigh a person.
1. Press the
display.
2. Have the person sit down on the scale. The
is on in the upper display and beeps to indicate the end of the weighing process.
3. To change the display from LB to KG and vice-versa, press the
4. To turn off the scale, press and hold the
On/Off key to turn on the scale and 0.0 will appear on the display along with ZERO on the upper
display shows the person’s weight, and the LOCK annunciator
LB/KG key.
On/Off key until OFF appears on the display.
4.2 Hold/Release Function
Use the following steps to use the Hold/Release function:
1. When the person is on the scale, press the
2. When the person gets off the
scale, the weight and the HOLD & LOCK annunciator will remain on the
Hold/Release key.
display.
3. At this stage the
Release key one more time.
ZERO key will not work. The only way to return to zero from here is to press the Hold/
Pressing the HOLD key prior to a person getting on the scale will also work.
4.3 Preset Tare
Use the following steps to use the Preset Tare:
1. When the weight is set to
returns to
0.0 and NET appears on the display.
0.0, place the extra load on the scale and press the TARE key until the display
2. Remove the extra load from the scale. The weight will appear
3. Ask the patient to sit down on the scale with the extra
weight. The
4. To cancel the tare weight, press and hold the
display turns back to
NET annunciator is still on. The weight of the extra load remains stored in memory.
TARE key until NET disappears from the display and the
0.0 and GROSS appears. Tare weight is also canceled when the scale is turned off.
weight. The display then shows the patient’s
4.4 Toggle Tare
Use the following steps to use the Toggle Tare function:
1. When the weight is set to
2. The default tare value is displayed (default is programmed to be 33
flashing.
0.0, press the TARE key.
with a negative symbol to the left of it.
.0 LB/15.0 KG), while the zero is
10 Rice Lake 550 Digital Chair Scale Technical Manual
Page 15
3. Use the UP/DOWN arrow keys to adjust the value.
4. Press ENTER to start the tare function and the NET annunciator will be turned on instead of the GROSS
annunciator.
4.5 Using the Body Mass Index (BMI) Function
Use the following steps in determining the BMI.
LB Mode
1. Ensure that the scale is at zero.
2. Have the person sit down on the scale to obtain a weight.
3. The LOCK annunciator is illustrated on the display.
4. Press the BMI key. The BMI and FT/IN annunciators are lit on the display and a default value of 5 feet
and 7.5 inches (ie: 5-07.5) is flashing.
5. Use the UP/DOWN arrow keys to adjust the height value, and press the ENTER key to move to the next
step.
6. The BMI value and BMI annunciator is shown on the display. Press CLEAR to return to the weighing
mode and the BMI function will be turned off.
KG Mode
1. Ensure that the scale is at zero.
2. Have the person sit down on the scale to obtain a weight.
3. The LOCK annunciator is illustrated on the display.
4. Press the BMI key. The BMI and CM annunciators are lit on the display and a default value of 170.0 cm
(ie: 170.0) is flashing.
5. Use the UP/DOWN arrow keys to adjust the height value, and press the ENTER key to move to the next
step.
6. The BMI value and BMI annunciator is shown on the display. Press CLEAR to return to the weighing
mode and the BMI function will be turned off.
Rice Lake 550 Digital Chair Scale - Scale Operation 11
Page 16
5.0 Scale Configuration
Remove four screws to access setup switch
Setup switch location
Battery
compartment
DEFCALIBPROG
DONE
Options and parameter setup are done through the scale configuration section and is used for setting values,
parameters, and options that are essential for the functioning of the scale. Access to the setup switch is located
under the tilt stand cover. Use a Phillips head screwdriver to remove the four screws holding the cover in place.
(shown in Figure 5-1— left photo).
Figure 5-1. Setup Switch Location
Use the following steps to enter into configuration mode.
1. Make sure the scale is turned off.
2. Turn the scale on by simultaneously pressing the
3. Continue to hold both keys until
Id appears. The unit cycles through its startup function and continues to
display the software version.
4. Access the recessed setup switch located in the back of the
small screwdriver or other similar object to press the setup switch.
5. Once the setup switch is pressed,
PROG appears on the display.
6. The scale can be configured using a series of menus ac
setup mode.
On/Off key and the ENTER key.
indicator. You can use a small paper clip,
cessed through the front panel when the scale is in
7. Press the BMI key to advance to the desired menu.
8. Press the
12 Rice Lake 550 Digital Chair Scale Technical Manual
ENTER key and advance in the manual to the related menu selection for further instructions.
Figure 5-2. Top Level Menu
Page 17
5.1 Programming Mode Menu
value
P00
DEF
Value
CALIBPROG
FULL
DONE
BAUD
TOFF
ATOLALEN
ATOUT
UNITS
OP
P01
P02
P03
P04
5
3
4
2
0
1
9
8
7
6
96
1152
48
576
288
384
192
144
DISPROUND
ARW
LOAD
SALASTART
P01-0 P02-1 P03-0 P04-1P00-1
0.0
0.0000
0
0.000
0.00
0.2
1.0
0.5
2.0
10.0
5.0
20.0
0.1
ValueValue
Value
Kg/Lb
Kg
Lb
ValueValue
Value
TEST
Various parameters can be set while in programming mode.
Those parameters are shown in Figure 5-3.
Figure 5-3. Programming Mode Menu Structure
Table 5-1 lists the various display messages and sequence when setting up the scale.
Parameter Description Choices Steps
FULL Full capacity of the scale Value (1000 lb) The display toggles between a numeric value and FULL.
Table 5-1. Configuration Mode Menu
If you don’t want to change the value, press the BMI key to
ve to the next setting. Example: from FULL to LOAD. If you
mo
want to change the value, use the following steps.
1. Press the EN
TER key to change value starting with
the right most digit.
2. Use the Up/Down arr
ow keys to increment/
decrement numbers.
3. Press the BMI key to move to th
4. Use the Up/Down arr
decrement numbers.
5. Press the BMI k
ey again to move to the left
6. Use the Up/Down arr
decrement numbers.
7. When done press the ENTER
next parameter (LOAD).
e left.
ow keys to increment/
ow keys to increment/
key to move to the
Rice Lake 550 Digital Chair Scale - Scale Configuration 13
Page 18
Parameter Description Choices Steps
LOAD This is the amount of weight
applied during calibration.
Can also be changed in the
calibration menu.
ASTART Weight process start limit —
Maximum (full capacity)/10.
Determine when the weight
algorithm starts (when the
“----” is displayed), below this
value the scale will show live
weight.
ARW Auto Reweigh — Restarts the
weight algorithm if the weight
changed by more than this
value.
SAL Semi Auto Live —This value is
the interval between weight
displays during the algorithm
process.
Value (200 Lb) The display toggles between a numeric value and LOAD.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from LOAD to ASTART. If
you want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. Press the BMI key to move to the left.
4. Use the Up/Down arrow keys to increment/
decrement numbers.
5. When done, press the ENTER key to move to the
next parameter (ASTART).
Value (2.0) The display toggles between a numeric value and ASTART.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from ASTART to ARW. If
you want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. Press the BMI key to move to the left.
4. Use the Up/Down arrow keys to increment/
decrement numbers.
5. When done, press the ENTER key to move to the
next parameter (ARW).
Value (4.0 Lb) The display toggles between a numeric value and ARW.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from ARW to SAL. If you
want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. Press the BMI key to move to the left.
4. Use the Up/Down arrow keys to increment/
decrement numbers.
5. When done, press the ENTER key to move to the
next parameter (SAL).
Value (0.5) The display toggles between a numeric value and SAL.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from SAL to ROUND. If
you want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. When done, press the ENTER key to move to the
next parameter (ROUND).
Table 5-1. Configuration Mode Menu (Continued)
14 Rice Lake 550 Digital Chair Scale Technical Manual
Page 19
Parameter Description Choices Steps
ROUND Scale Resolution —
Values in kg: 1, 2, 5, 10, 20,
50, 100
Values in lb: 1, 2, 5, 10, 20,
50, 100, 200
DISP 0.0
BAUD Baud rate 96
ATO L Algorithm initial tolerance —
Maximum value is 255.
Values above 255 will not let
you proceed and will return to
the previous value.
ALEN Algorithm initial exponent —
Maximum value 10.
Values above 10, will not let
you proceed and will return to
the previous value.
0.2
0.5
1.0
2.0
5.0
10.0
20.0
0.1
0
0.0000
0.000
0.00
48
1152
576
384
288
192
144
Value (10) The display toggles between a numeric value and ATOL
Value (8) The display toggles between a numeric value and ALEN.
The display toggles between a numeric value and ROUND.
The decimal point location is set to the DISP parameter
display decimal point location.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from ROUND to DISP. If
you want to change the value, use the following steps.
1. Press the ENTER key to change value.
2. Press the Up/Down arrow keys to change the
available parameters.
3. When done, press the ENTER key to move to the
next parameter (DISP).
The display toggles between a numeric value and DISP.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from DISP to BAUD. If you
want to change the value, use the following steps.
1. Press the ENTER key to change value.
2. Use the Up/Down arrow keys to change the
available parameters.
3. When done, press the ENTER key to move to the
next parameter (BAUD).
Note: Indicator display illustrates first two digits of baud rate
only.
The display toggles between a numeric value and baud.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from BAUD to ATOL.
If you want to change the value, use the following steps
1. Press the ENTER key to change value.
2. Use the Up/Down arrow keys to change the
available parameters.
3. When done, press the ENTER key to move to the
next parameter (ATOL).
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from ATOL to ALEN. If you
want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. Press the BMI key to move to the left.
4. When done, press the ENTER key to move to the
next parameter (ALEN).
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from ALEN to ATOUT. If
you want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. When done, press the ENTER key to move to the
next parameter (ATOUT).
Table 5-1. Configuration Mode Menu (Continued)
Rice Lake 550 Digital Chair Scale - Scale Configuration 15
Page 20
Parameter Description Choices Steps
ATO UT Algorithm maximal exponent
— Maximum value is 15.
Values above 15, will not let
you proceed and will return to
the previous value.
TOFF Auto off timer — Measured in
minutes.
0 = always on.
Maximum is 9 minutes.
When using an external power
supply, this parameter is
irrelevant.
UNITS Units — Selects the unit of
measure. It can be either
Kg/Lb, Kg only or Lb only.
OP Binary options:
OP0 — Live weighing options
(0=disable, 1=enable)
OP1 — Communication
protocol (0=ESC,
1=maintenance)
OP2 — BMI menu (0=disable,
1=enable)
OP3 — RTC power
(0=disable, 1=enable)
OP4 - Semi-Auto-Live —
(0=disable, 1=enable)
OP5 - Full calculation —
(0=spatial, 1=multiply by
(0=disable, 1=enable
OP6 - Tare - (0=disable,
1=enable
OP7 - Bat type — (0=dry
batteries, 1=rechargeable
batteries)
OP8 — OIML mode (0=disable, 1=enable
Press the BMI key to cycle back to the top level menu choices, ie: PROG/CALIB/DEF/DONE/TEST
Value (10) The display toggles between a numeric value and ATOUT.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from ATOUT to TOFF. If
you want to change the value, use the following steps.
1. Press the ENTER key to change value starting with
the right most digit.
2. Use the Up/Down arrow keys to increment/
decrement numbers.
3. Press the BMI key to move to the left.
4. Use the Up/Down arrow keys to increment/
decrement numbers.
5. When done, press the ENTER key to move to the
next parameter (TOFF).
5
4
3
2
1
0
9
8
7
6
KG/LB
KG
LB
OP0
OP1
OP2
OP3
The display toggles between a numeric value and TOFF.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from TOFF to UNITS.
Press the ENTER key to move to the next parameter. (UNITS).
If you want to change the value, use the following steps.
1. Press the ENTER key to change values.
2. Use the Up/Down arrow keys to change the
available parameters.
3. When done, press the ENTER key to move to the
next parameter (UNITS).
The display toggles between unit of measurements and UNIT.
If you don’t want to change this value, press the BMI key to
move to the next setting. Example: from UNITS to OP. If you
want to change the value, use the following steps.
1. Press the ENTER key to change values.
1. Press the Up/Down arrow keys to change the value.
2. When done, press the ENTER key to move to the
next parameter (OP).
The display toggles between a binary option and POO-0.
If you don’t want to change this value, press the BMI key to
move to the next setting. If you want to change the value, use
the following steps.
1. Press ENTER to change parameters.
2. Use the Up/Down arrow keys to select the display
value you want to change.
3. Press the BMI key to move the flashing cursor.
3a. Use the
3b. Press the BMI key to move the flashing cursor.
4. Press the ENTER key to save all of the display
parameters. SAVE appears on the display.
5. Press the ENTER key again and DONE appears
indicating that you are now done entering all of the
parameters of the scale.
Up/Down
arrows to change the value.
Table 5-1. Configuration Mode Menu (Continued)
16 Rice Lake 550 Digital Chair Scale Technical Manual
Page 21
5.2 Default Menu
DEFCALIBPROG
DONE
TEST
NO
YES
Note
Setup switch location
on back of indicator.
The default menu is used to return the scale back to its factory settings and is shown in Figure 5-4.
Figure 5-4. Default Menu
Use the following steps to return the settings back to their factory default.
1. Press the
ENTER key. The display shows a default value of NO.
2. To change to YES, press the Up/Down arrow keys.
3. Press the
4. Press the
ENTER key and the display shows DONE.
BMI key to return to PROG/CALIB/DEF/DONE/TEST upper level menu.
Selecting YES and pressing the ENTER key will reset to factory defaults settings without changing the
calibration and will return you to weigh mode.
5.3 Scale Calibration
Use the following steps to calibrate the scale.
1. Turn on scale by pressing the
2. The unit cycles through its startup fu
hold both keys until
Id appears.
3. Access the setup key located in the back of the scale to ente
use a small paper clip, small screwdriver or other similar object to press the setup key.
On/Off key and the ENTER key simultaneously.
nction and continues to display the software version. Continue to
r the setup parameters for the scale. You can
4. Prog appears on the display. Press the BMI key to toggle along the parameter menu.
5.
Calib appears on the display and enter the calibration parameters.
6. Press the
for calibration. Lb will be flashing. To switch between lb and kg, press the
display. Once a unit is selected, press
7. To change the calibration load value, use the
digit.
8. Use the
Figure 5-5. Setup Switch Location on Back of Indicator
ENTER key and a numeric value is displayed which represents the amount of weight that is used
Up/Down arrow keys on the
ENTER and the right most digit will be flashing.
Up/Down arrow keys to increment/decrement the flashing
BMI key to move the flashing digit to the left or right.
Rice Lake 550 Digital Chair Scale - Scale Configuration 17
Page 22
9. Once all the digits have been entered, press the ENTER key and Clear is displayed.
DEFCALIBPROG
DONE
TEST
VER BAT VALUE A2D
1.83
value
value
value
10. Make sure the scale platform is clear of weight and press the
11. A request to put the chosen load
on the platform is displayed by Put xxx.xx.
12. Put the chosen weight on the platform and press the
13. Press the
14. Press the
15. Press the
To exit calibration without changing zero or span exis
ENTER again and the display indicates Done.
BMI key three times to exit back out to the top level Done parameter.
ENTER key to return to weigh mode.
ting calibration, press the CLEAR key, then the BMI key.
ENTER key. ===== is displayed and then Save.
ENTER key again and ===== is displayed.
6.0 Test Menu
To access the TEST menu, use the following steps.
1. Turn the scale on by pressing the
2. Press the
3. Continue to press the
4. Once complete, press the
5. Press the
ENTER key again.
BMI key to scroll through the various menu items.
BMI key again and Done is displayed.
ENTER key to start the weighing process.
On/Off key and the ENTER key simultaneously until ID flashes.
Figure 6-1. Test Menu
Tes t M e n u
Parameter Choice Description
VER Valu e Displays the current software version.
BAT Value Displays the current battery level.
VALUE Val ue Displays the actual value.
A2D Val ue Displays the actual raw counts of the scale.
Table 6-1. Test Menu
18 Rice Lake 550 Digital Chair Scale Technical Manual
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7.0 RS-232 Communication
The scale comes with an RS-232 port that enables weight data to be transmitted to other equipment, such as a
computer or printer. The RS-232 cable with DB-9 connector (PN 100719) is available from Rice Lake Weighing
Systems.
The RS-232 parameters are 9600 baud (selectable in the programming mode), 8 data bits, 1 stop bit, no parity
and no handshaking.
There are three methods of communication:
7.1 Pushbutton Keypad Print
With a stable, in-range weight, press and hold the LB/KG/Print key for at least three seconds, or until the scale
displays
either in motion, or out of range.
xxxxxxxxx<SP>uu<SP>mmmmm<SP><CR><LF>
Where:
Example:
Figure 3-16 on page 8 shows where the RS-232 connection is.
• Pushbutton keypad print
• Escape protocol
• Maintenance protocol
PRINT. Note that if the scale does not beep after five seconds, then release the button as the weight was
• If displaying weight and not BMI, the scale will send out the following 21 character string:
xxxxxxxxx is the weight with decimal point and " - " sign, if negative uu is the unit (lb or kg).
mmmmm is the mode (gross or net)
60.1 KG= <PATIENT><SP><WEIGHT><SP>-60.1<SP>KG<SP><CR><LF>
• In BMI mode (displaying the BMI value), the scale will send out the following data:
PATIENT WEIGHT 60.1 KG
PATIENT HEIGHT 170.0 CM
PATIENT BMI 20.8
Example in KG:
<PATIENT><SP><WEIGHT><SP>-60.1<SP>KG<SP><CR><LF>
<PATIENT><SP><HEIGHT><SP>-170.0<SP>CM<SP><CR><LF>
<PATIENT><SP><B><SP><M><SP><I><SP><SP><SP><20.8<SP><SP><SP><SP><CR><LF>
Example in LB:
<PATIENT><SP><WEIGHT><SP>132.4<SP>LB<SP><CR><LF>
<PATIENT><SP><HEIGHT><SP>-5-07.5<SP>FT<SP><CR><LF>
<PATIENT><SP><B><SP><M><SP><I><SP><SP><SP><20.4<SP><SP><SP><SP><CR><LF>
In case of under weight or over weight, the word Under or Over will be sent correspondingly.
Rice Lake 550 Digital Chair Scale - RS-232 Communication 19
Page 24
7.2 Communication Protocols
The Rice Lake Digital Chair Scale has two communication protocols, escape and maintenance protocol.
7.2.1 Escape Protocol
An escape protocol is where the escape (0X1B or ASCII 27) is used to indicate that there is a command
following. On the PC side there must be a listener created by the vendor that will interpret this protocol. This
listener must also take care of all the issues regarding data integrity, etc. to make sure that the data that was sent
and received is valid.
Two examples include:
• Scale initiated communication
• PC initiated communication
Table 7-1 is what can be sent across communications
PC Initiated ESC Value
lines.
Request current va
Diagnostics A
Send scale control messages C
PC Initiated ESC Value
Send single reading R
Send diagnostic response
lues/settings R
Table 7-1. Escape Protocol Commands
Table 7-2 lists the ESC characters that will be used.
ESC value with
Name ESC character
Reading R R Tells the PC that the scale is sendi
Weight W Wnnn.n Is the patient weight (example: W020
Height H Hnnn.n Patient height
BMI B Bnn.n Patient BMI
Units N Nc Indicates in which unit the values have been
End of Packet
OP)
(E
Diagnostics
(r
equest)
Diagnostics
esponse)
(r
Control (set a
ue)
val
E E Indicates that the end of the command has been reached.
A Accc A request for a diagnostic test on certain parts of the scale (such as
Z Zccc This will be the response of the diagnostics done on the scale. Values
C Cccc=c Sets the value of the scale’s global settings. Example:
parameters
Description
ng a reading. Immediately following
this is the value that is sent. Example:
<ESC><R>ESC><W0200.0<ESC>Nm<ESC>E
00 means 200.0). If the scale is
overloaded or under loaded, the scale will return the value 999.99.
c=constitutional).
battery life, load cells).
will include error codes to indicate what is wrong with the scale, or all
zeros (Z000) to indicate that all is well.
<ESC><CUOM=m><ESC><E will set the unit of measurement.
taken (m=metric,
Table 7-2. ESC Characters
Name of Control Identifier Unit
Unit of Measure (metric or constitutional) UOM c (m or c)
Table 7-3. Scale Global Values List and Identifiers
20 Rice Lake 550 Digital Chair Scale Technical Manual
Page 25
Samples of Escape Protocol
&4$3&4$&
3FBEJOH
SFRVFTU
&01
3#!,%0#
&01
6OJUPG.FBTVSF.FUSJD
&4$3&4$8&4$/N&4$&
3FBEJOH
$PNNBOE
8FJHIU
&4$"#"5&4$&
%JBHOPTFCBUUFSZ
&01
3#!,%0#
DIRECTIONOFCOMMUNICATION
&4$;&6&4$&
#BUUFSZJTPLBZ
OPFSSPST
&01
&4$;&-&4$&
#BUUFSZJTWFSZMPX
6OTUBCMF
&01
Figure 7-1 and 7-2 show what the diagrams will look like on the PC as the scale measures weight and sends over
this communications line:
Figure 7-1. Sample of Escape Protocol
Figure 7-2. Sample of Escape Protocol
When the user wants to diagnose the problems on the scale, it looks like the Figure 7-3 and 7-4.
Figure 7-3. Diagnose the Escape Protocol Diagram
Figure 7-4. Diagnose Battery Protocol Diagram
Rice Lake 550 Digital Chair Scale - RS-232 Communication 21
Page 26
7.2.2 Maintenance Protocol
USB Connection
Table 7-4 lists the maintenance protocol commands.
Command Definition
R Reboot
V Firmware ID + development version
W Current weight
A Current AD
Z Zero the scale
F Show flash values (used for the first flash process)
L USB On/Off (not available on USB communication
Table 7-4. Maintenance Protocol Commands
7.3 USB Connection
The Rice Lake Digital Chair Scale has the capability of connecting to a PC using a USB connection and a USB
cable (not included). That connection location is shown in Figure 7-5.
Figure 7-5. USB Connection Port
Connecting software and downloads should be addressed by your IT department and can vary depending on what
type of computer platform you’re using. Basic information on USB driver installation using Windows
®
is
described in the following steps and serves only as an example. The USB driver can be downloaded from the
Rice Lake Weighing Systems website at the following location; http://ri
Select Medical/Health Scales downloads/software and Get Downl
celake.com/software.aspx
oads. Opening any product will show a USB
driver download. Click on Download to open and download the driver to your computer.
1. The graphic shows the window that pops up when the USB cable is connected to the indicator and the
le is turned on.
sca
Figure 7-6. Hardware Wizard Found Screen
22 Rice Lake 550 Digital Chair Scale Technical Manual
Page 27
Follow the on screen prompts to navigate through the screens shown below.
2. Select No, not this time and then select Next.
3. Select Install the software automatically then select Next.
4. The following screen appears while the driver is installing on to your system.
Rice Lake 550 Digital Chair Scale - RS-232 Communication 23
Page 28
5. The following screen appears when installation is complete. Click on Finish.
Note
6. If you want to verify the installation, you can view the driver by looking at the device manager of your system.
7. To print a ticket using the USB driver, open the software driver (shown above) and the port assigned to
that driver is shown.
8. Ensure that the USB cable is properly connected and the unit is on.
9. Another terminal type program (such as Hyperterminal) needs to be opened and connected through the USB
driver to the indicator to be able to see the information being sent to the PC. A port needs to be established so
select the port that is assigned to Parpar and print the ticket. The following are examples of print tickets.
A single print ticket has four spaces after the “patient weight” and only one space between weight and
lb in the examples shown above. Then seven <CR><LF> after.
24 Rice Lake 550 Digital Chair Scale Technical Manual
Page 29
8.0 Troubleshooting and Testing
Refer to the following to check and correct any failure before contacting service personnel.
Symptom Possible Cause Corrective Action
Scale does not turn on Dead battery Connect the scale to a power source.
Faulty electrical outlet Use a different electrical outlet.
Bad power supply Replace optional adapter.
Questionable weight or the
s
cale does not zero
The display shows E messages as detailed below.
E06 Identifier - ADC AD too high
E07 AD too low
E10 Overload Scale has been overloaded. Remove load from scale.
E4L BAT
E4U
E11 CAL
Err 2 Low saturation state (low A/D) The load cell is not connected properly
Err 3 High saturation state (hig
Err 6 Unstable weight. Cannot
SAT Damaged load cell cable Replace load cell cable.
External object is interfering
with the scale.
Display did not show 0.0 before
ng.
weighi
Scale is not placed on a level
.
floor
Scale is out of calibration. Check the weight with a known weight va
h A/D) See Err 2.
librate.
ca
Remove the interfering object from the scale.
Help the patient off the scale, zero the scale and begin the weighing process
again.
Ensure the scale is level and begin the weighing process again.
Battery low but still useable
Battery low and unstable
Calibration Error
connections. If the problem persists, replace the set of load cells.
Check the load cells’ mechanical surroundings and see that nothing touches
them and that the cables are properly welded.
— recalibrate the scale again.
— 1 bar left on the indicator display.
— no bars left on the indicator display.
. Check the cables and mechanical
lue.
Table 8-1. Troubleshooting Table for the Rice Lake Scale Line
9.0 Maintenance
The following section provides instructions for maintaining and cleaning the Rice Lake line of scales.
Maintenance operations other than those described in this section should be performed by qualified service
personnel.
9.1 Basic Maintenance
Before the first use of the scale and after periods of non-use, check the scale for proper operation and function. If
the scale does not operate correctly, contact qualified service personnel.
Go through the following ste
1. Check the overall appearance of the entire scale fo
2. Inspect the condition of the optional AC adapter for cord cracking or fraying or for broken or bent
p
rongs.
9.2 Cleaning
Proper care and cleaning is essential to ensure a long life of accurate and effective operation. Before beginning
the cleaning process, disconnect the scale from the AC power source.
1. Clean all external surfaces with a clean, damp cloth or tissue. Mild
Dry with a clean soft cloth.
2. Do not immerse the scale in cleaning or other liquid solutions.
3. Do not use isopropyl alcohol or other solutions to cl
ps for basic maintenance.
r any obvious signs of damage.
soap and water solution may be used.
ean the display surface.
Rice Lake 550 Digital Chair Scale - Troubleshooting and Testing 25
Page 30
10.0 Rice Lake Chair Scale Specifications
Power
Optional AC Adapter - 120 VAC-9VDC-60Hz / 230
VAC-9VDC-50Hz
Battery Type
(6) AA size Alkaline batteries
Battery Use
25 hours continuous use
Automatic power-off can be configured
Data Communications
RS-232 with RJ-45 jack
USB Connection
Selectable baud rate, default - 9600
8 bits
No parity
1 stop bit
No handshaking
Environmental
Operating Temperature
50 to +95°F (10 to 35°C)
Storage Temperature
32 to 122°F (0 to 50°C)
Humidity
85% relative humidity
Capacity and Graduation
Digital Chair Scale
660 Lb (300 Kg) 0.2lb (0.1Kg)
Certifications and Approvals
RoHS Compliant
26 Rice Lake 550 Digital Chair Scale Technical Manual
Page 31
For More Information
System Manuals
• Rice Lake 550 Digital Chair Scale Operation Manual, PN 130893
Literature
•4-color 550-10 Series Digital Chair Scale 550-10 Series literature, PN 130955
Web Site
• http://www.ricelakehealth.com
Contact Information
Hours of Operation
Knowledgeable customer service representatives are available 6:30 a.m. - 6:30 p.m. Monday through Friday and
8 a.m. to 12 noon on Saturday. (CST)
Telephone
• Sales/Technical Support 800-472-6703
• Canada and Mexico Customers 800-321-6703
• International 715-234-9171
Immediate/Emergency Service
For immediate assistance call toll-free 1-800-472-6703 (Customers in Canada and Mexico, please call
1-800-321-6703). If you are calling after standard business hours and have an urgent scale outage or emergency,
press 1 to reach on-call personnel.
Fax
Fax Number 715-234-6967
Email
• U.S. sales and product information at prodinfo@ricelake.com
• International (non-U.S.) sales and product information at intlsales@ricelake.com
Mailing Address
Rice Lake Weighing Systems
230 West Coleman Street
Rice Lake, WI 54868 USA
Rice Lake 550 Digital Chair Scale - Rice Lake Chair Scale Specifications 27
Page 32
Rice Lake Digital Chair Scale Limited Warranty
Rice Lake Weighing Systems (RLWS) warrants that all RLWS equipment and systems properly installed by a
Distributor or Original Equipment Manufacturer (OEM) will operate per written specifications as confirmed by
the Distributor/OEM and accepted by RLWS. All systems and components are warranted against defects in
materials and workmanship for two years.
RLWS warrants that the equipment sold hereunder will conform to the current written specifications authorized
by RLWS. RLWS warrants the equipment against faulty workmanship and defective materials. If any equipment
fails to conform to these warranties, RLWS will, at its option, repair or replace such goods returned within the
warranty period subject to the following conditions:
• Upon discovery by Buyer of such nonconformity, RLWS will be given prompt notice with a detailed
explanation of the alleged deficiencies.
• Individual electronic components returned to RLWS for warranty purposes must be packaged to
prevent electrostatic discharge (ESD) damage in shipment. Packaging requirements are listed in a
publication, Protecting Your Components From Static Damage in Shipment, available from RLWS
Equipment Return Department.
• Examination of such equipment by RLWS confirms that the nonconformity actually exists, and was
not caused by accident, misuse, neglect, alteration, improper installation, improper repair or
improper testing; RLWS shall be the sole judge of all alleged non-conformities.
• Such equipment has not been modified, altered, or changed by any person other than RLWS or its
duly authorized repair agents.
• RLWS will have a reasonable time to repair or replace the defective equipment. Buyer is responsible
for shipping charges both ways.
• In no event will RLWS be responsible for travel time or on-location repairs, including assembly or
disassembly of equipment, nor will RLWS be liable for the cost of any repairs made by others.
THESE WARRANTIES EXCLUDE ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT
LIMITATION WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. NEITHER
RLWS
RLWS AND BUYER AGREE THAT RLWS’S SOLE AND EXCLUSIVE LIABILITY HEREUNDER IS LIMITED TO
REPAIR OR REPLACEMENT OF SUCH GOODS. IN ACCEPTING THIS WARRANTY, THE BUYER WAIVES ANY AND
ALL OTHER CLAIMS TO WARRANTY.
SHOULD THE SELLER BE OTHER THAN RLWS, THE BUYER AGREES TO LOOK ONLY TO THE SELLER FOR
WARRANTY CLAIMS.
NO TERMS, CONDITIONS, UNDERSTANDING, OR AGREEMENTS PURPORTING TO MODIFY THE TERMS OF THIS
WARRANTY SHALL HAVE ANY LEGAL EFFECT UNLESS MADE IN WRITING AND SIGNED BY A CORPORATE
OFFICER OF RLWS AND THE BUYER.
NOR DISTRIBUTOR WILL, IN ANY EVENT, BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.
© Rice Lake Weighing Systems, Inc. Rice Lake, WI USA. All Rights Reserved.
RICE LAKE WEIGHING SYSTEMS • 230 WEST COLEMAN STREET • RICE LAKE, WISCONSIN 54868 • USA
28 Rice Lake 550 Digital Chair Scale Technical Manual
Page 33
Page 34
230 W. Coleman St. Rice Lake, WI 54868 USA
U.S. 800-472-6703 Canada/Mexico 800-321-6703 International 715-234-9171 Europe +31 (0) 88 2349171
www.ricelake.com www.ricelake.mx www.ricelake.eu www.ricelake.co.in m.ricelake.com
© Rice Lake Weighing Systems 09/2014 PN 155191, Rev C
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