BT84
BT84
Digital Scale Indicator
[pic]
TECHNICAL
MANUAL
NTEP COC# 99-154
Measurement Canada Approval# AM-5352
REV 10
Index: Pg 1 …………………Specifications
Pg 2 …………………LED’s and Switch Settings
Pg 3 …………………Push Buttons
Pg 4 …………………Configuration
Pg 5 …………………Configuration
Pg 6 …………………Configuration
Pg 7 ……………...… Configuration
Pg 8 …………………Load Cell Wiring And Calibration
Pg 9 …………………Serial Port Wiring and Data
Pg 10 ……………..…Serial String Data
Pg 11 ………………..Ext. Values/ Display Messages
Pg 12………………...Custom Serial Setup
Pg 13………………...Custom Serial Setup cont.
Pg 14…………………Custom Serial Setup&Time/Date
Pg 15…………………Custom Serial Worksheet
Pg 16…………………Custom Serial Worksheet cont.
Pg 17…………………ASCII Control Codes
Pg 18…………………ASCII Control Codes
BT84 Specifications
Power Supply
V input Range 12VDC, 500ma
Input Protection 20V transorb, also provides
reverse input protection.
Max Cells Up to 8 350( cells
Analog System
Analog input range -0.45 to 3.4 mV/V
Load cell excitation 10Vdc +/- 3%
Min. Microvolt/grad. 1.0
Load cell connections +/- Exc., +/- Sig., Shield
Raw Zero Drift < .2 (V/C(
Raw Span Drift < .2 (V/C(
Linearity 0.002% over range
A/D Conversion Method Delta-Sigma
A/D Raw Counts +/- 2,097,152 (+/-21 bits)
Displayed Graduations Up to 50,000
A/D Conversions/Sec. 60 or 50
Display updates/Sec. 10
Computer and Display
Display 6 digit, 0.56” with RH dp
Polarity Indication “-“ sign in left-most display pos.
Annunciator Bars 8
Push Buttons 5
Serial Interface Bi-directional RS232(Tx, Rx, Gnd)
Microprocessor 80c32-1
Speed 16 MHz
ROM Memory 32768 bytes
RAM Memory 256 bytes
EEPROM Memory 256 bytes
Option: Open collector output to drive
solid-state relay LED input.
Rated at 30mA max.
Environmental
Enclosure NEMA1 Aluminum
Powered Indicator Temp Rating -10.0 C( to 40.0 C(
Max Inside Enclosure 50.0 C(
Min Inside Enclosure 0 C(
Other
Overload is at 103% Capacity
Underload is at –1% Capacity
Minimum amplifier configuration 0.5mV/V load cell can display 5000
grads (1.0(V / graduation).
Page 1
[pic]
Lbs: weight displayed in pound engineering units.
Kgs: weight displayed in kilogram engineering units.
Setpoint: relay on (future option)
Mtn: scale is in motion.
Zero: weight is at zero with-in +/- ¼ grad
Net: typically the weight of the product in the container less
weight of container.
Gross: total weight on the scale
Tare: lit if tare of container was performed
Switches
S1-1: Open: Normal Mode
Closed: Configuration Setup
S1-2: Open: Normal Mode
Closed: Enable Extended Parameters in Setup.
S1-3: Open: Normal Mode
Closed: Front Panel Access Enabled
S1-4: Open: Normal Mode
Closed: Calibration Mode
Upgrade Note: Ver 2.02 (Front Panel access and Audit trail)
• For front panel access turn on S1-3. To allow configuration changes turn on S1-1. To allow Calibration changes turn on S1-4. If a switch is left open the function will be locked out from the front panel.
• To check the audit trail press the (G/N), (UNITS), and (Print) keys at the same time for 3 seconds. AU-C## is Calibration, AU-P## is Configuration. (ZERO), and (G/N) Change your selection. (TARE), (UNITS), and (PRINT) will exit the audit trail.
Page2
Push Buttons – Normal Operating Mode
[pic]
[ZERO]: Will zero scale in gross mode.
[ N/G ]: Toggles the scale between gross and net modes.
[TARE]: Zeroes the weight of a container before being filled and switches scale to
net weighing mode. (Resets weight in Peak hold mode)
[UNITS]: Toggles scale from lbs. to kgs.
[PRINT]: Initiates transmission of weight data via serial port.
Push Buttons – Configuration Mode
[pic]
Next Last EXIT Next Last
Parameter Parameter CONFIG Choice Choice
Go to the (QUIT) Parameter and press (TARE) to exit and save configuration when the front panel access is enabled.
Push Buttons – Calibration Mode
[pic]
Dead EXIT Set Digit Digit
Zero CAL Weight Select Increment
Push Buttons – Power Up Functions (Hold Button on Power Up)
[pic]
[ZERO]: No Function
[ N/G ]: No Function
[TARE]: Holds Display Test (press any pushbutton to test if an annunciator turns
off, the push button functions.)
[UNITS]: No Function
[PRINT]: Initializes EEPROM and calibrates A/D internally. (Use this to recover
from calibration error.)
Page3
Configuring the BT84
To enter configuration mode, close switch S1-1. If you wish to see extended parameters, also close S1-2. Hold (G/N) and (PRINT) for 3 seconds if front panel access is turned on with switch SW1-3
Push Buttons – Configuration Mode
[pic]
Next Last EXIT Next Last
Parameter Parameter CONFIG Choice Choice
Go to the QUIT parameter and press (TARE) to exit and save configuration.
Parameter Name Choices
0 Operating Mode Ind = The Indicator acts as an Indicator
Default = Ind rsd = The Indicator acts as a Remote Display
hides parameters 1 thru 10 when selected
Parameter Name Choices
1 Displayed Grads 5=500 100=10000
Default = 100 10=1000 120=12000
20=2000 140=14000
30=3000 150=15000
40=4000 160=16000
50=5000 180=18000
60=6000 200=20000
70=7000 250=25000
75=7500 300=30000
80=8000 400=40000
90=9000 500=50000
Parameter Name Choices
2 Grad Size 1
Default = 1 2
5
10
20
50
100
Parameter Name Choices
3 Decimal Pt. 0
Default = 0 0.0
0.00
0.000
0.0000
Page 4
Parameter Name Choices
4 N/A N/A
Parameter Name Choices Updates/sec Sec/update
5 Averaging 1 10 .1
Default = 1 2 5 .2
4 2.5 .4
8 1.3 .8
12 .8 1.2
16 .6 1.6
24 .4 2.4
32 .3 3.2
Parameter Name Choices
6 Tare Off
Default = AUTO Atnr Auto tare with no recall
AUTO Auto tare with recall
Peak Peak hold (Tare disabled)
Parameter Name Choices
7 Auto Zero Capture Band Off
Default = Off .5 grads
1 grads
3 grads
5 grads
10 grads
Parameter Name Choices
8 AZM/PAZ Aperature 1.9 = 1.9% Full Scale
Default = 1.9 100 = Full Scale
Parameter Name Choices
Motion Band Off
Default = Off (display grads) 1
3
5
10
20
50
Parameter Name Choices
10 Display Units lb. = Pounds Only
Default = Lb kg. = Kilograms Only
Lb.kg. = toggle lbs., kg.
Note: Lb.g resolution range is .00001 to .01 Lb. Lb.G = toggles lbs., grams
Lb.Oz resolution range is .0001 to .05 Lb. Lb.OZ = Toggles lbs., onces
Page 5
Parameter Name Choices
11 Serial Setup Co = Continuous Output
Default = Off dE = Demand Print
UPS = UPS transmit
UPS Computer Setup: In your computer go to C:/UPS/Uows/Scale.ini
Add the following information to the scale listings. (Note: You may copy another scale and change.)
[BT84 SHIPPING SCALE]
ScaleType=S
BaudRate=9600
DataBits=7
Parity=O
StopBits=1
LbsIndicator=lb
KgsIndicator=kg
InMotionIndicator=gr
StableIndicator=GR
StabilityCount=3
RequestCommand=82,13
Sleep=200
TeeterFactor=.05
OutputStringFormat=NXXXDXXSUUSMMSSCL
Save scale.ini and then restart UPS Worldship. Then select tools, and system preferences. Click on the Hardware tab. Select the Com port your scale is connected to on your computer. Select the scale then press test scale. If the scales works without errors press OK on the Scale screen and the system preferences screen to enable the scale.
Parameter Name Choices
12 Output Mode Gtn = gross/tare/net output
Default = Gtn (Active in demand mode only) nEt = net or gross only
Parameter Name Choices
13 CR Delay Off
Default = Off (Active in gtn demand mode only) 1 = 1 second
2 = 2 second
3 = 3 second
Parameter Name Choices
14 Baud Rate 3 = 300 baud
Default = 96 6 = 600 baud
12 = 1200 baud
24 = 2400 baud
48 = 4800 baud
96 = 9600 baud
192 = 19200 baud
Parameter Name Choices
15 Serial Protocol 7o1= 7 data bits, odd parity, 1 stop bit
Default = 7E1 7E1= 7 data bits, even parity, 1 stop bit
8n1= 8data bits, no parity, 1 stop bit
Page 6
Parameter Name Choices
16 String Configuration Std = Standard String
Default = Std Ct1 = Custom String Config.
*** To use custom string configuration, see page 12.
Parameter Name Choices
20 Remote Printing Loc = Local printing from Indicator
Default = Loc Re = Remote print to BT 84XL***
*** The BT84 must be the remote display.
*** BT 84 XL must be thePrimary indicator. The BT84 will remote print out of the BT84XL’s port 2.
*** All keypad buttons are functional on both indicator and remote display.
Parameter Name Choices
30 Time t1 = time
Parameter Name Choices
31 Date dA = date
Parameter Name Choices
32 On/off time and date*** Yes = print time and date
Default = No No = time and date off
***Only works when Parameter 16 is set on Std.
Parameter Name Choices
33 12hr/Military time 12H = Prints AM or PM
Default = 12H 24H = Prints Military time
Note: (Selection is for any time or date print out)
Parameter Name Choices
34 International T & D ENG = MM/DD/YY
Default = ENG INT = YY/MM/DD
Note: (Selection is for short format only)
***For More Time and Date choices, see page 13.
***Time and Date option must be installed for Time and Date to function.
Page 7
Load Cell Wiring
Shield- Connect to the cable clamp on the connector
[pic]
BT84-Calibration Proceedure
Push Buttons – Calibration Mode
[pic]
Dead EXIT Set Digit Digit
Zero CAL Weight Select Increment
Calibration Sequence
1) Press the (Gross/Net) key and the (Units) key at the same time for 3 seconds with switches SW4 and SW3 closed. Or with SW 3 Open, Close SW 4 to enter Cal. Display will now show CXXXXX with the “C” flashing, the “X”’s could be any number on initial calibration.
2) Remove all weight from scale and press the[ZERO] button. Indicator should now read [C 00].
3) Apply >10% of capacity in weight to scale platform.
4) Press [TARE] button. The display will now show [XXXXXX] with the “X”’s being a digit 0-9. Press the units button to move the digit to the right and the print button to increment the digit. When you have the display reading the same as the amount of weight you put on the scale, press the [TARE] button again. The displayed weight will now be steady and the “C” will be flashing.
5) Take the weight off the scale and check zero. Then reapply the weight and make sure the meter reads correctly.
6) If everything is correct, press the (Gross/Net) key and you are finished calibrating the scale, or open SW 4. If the readings in step 5 are not correct, repeat steps2-5.
Audit Trail
To View the audit trail hold the (G/N), (UNITS), and (PRINT) for 3 seconds.
AU-C## = Calibration, Number range is 1 – 99 (Returns to 1 after 99)
AU-P## = Configuration, Number range is 1 – 99 (Returns to 1 after 99)
Push Buttons – Audit Trail
[pic]
Next Last EXIT EXIT EXIT
Parameter Parameter Audit Audit Audit
The Audit trail increments when meteorological settings are changed and saved.
There is no way to reset the audit trail.
Page 8
Serial Port Wiring and Data
Serial Port Wiring
Common Receive Transmit Plus Minus
C R S + -
TB2
RS232 Setpoint
Serial Information:
Port is always in full duplex mode.
1 Start, 7 Data, 1 Stop Bit
Continuous String:
Demand String: (net), Gross Displayed
Demand String: (net), Net Displayed
Demand String: (Gtn), Gross Displayed
Demand String: (net), Net Displayed
Page 9
Serial Data Continued
Key:
ASCII Start of text character (02H)
Polarity: Space Character for positive number; a negative
sign (xxH) for a negative number.
7 character number representing the weight. Leading zeros
are spaces and a decimal point is possible.
ASCII space character (20H)
, Two or one character representation of either pounds or
kilograms. This is the units of the number.
One or more character representation of either gross, net or
tare is the weight indicated by the number.
‘ ‘ if none of the following are true:
‘O’ Over/Under range
‘M’ Motion
ASCII carriage return (ODH)
ASCII line-feed (OAH)
Serial Input Commands:
Print (motion inhibited)
Request print data.**WILL PRINT REGARDLESS
OF MOTION.
Zero weight (must be in gross mode)
Tare weight (automatically switches to net if in gross mode)
Display gross weight
Display net weight
Toggle G/N display
Switch units lb/kg
• Any other data received is ignored.
• The is the only that will respond by sending weight to the host.
• All commands must be appended by a (a can be sent but will be ignored.)
• Commands must be capital letters, lower case will not function.
NOTE: CONTINUOUS TRANSMISSION
If 1200 baud is selected with 10 updates/sec., there will be missed serial updates
since the time of transmitting a 14 character string takes about 117 ms., select at
least 2400 baud.
Page 10
Extended LED Values and Display Messages
To see extended LED Values, close SW1-1 and SW1-2 and press the[ZERO] button until you go past parameter 31. The extended values will be displayed with their corresponding LED. To step through these values press[ZERO] button. When finished turn off SW1-1 and SW1-2 and this will return you to normal weighing mode.
LED’s
[pic]
Tare Indicates mV/V input
Gross *Full Scale Calibration in mV/V (Write this value down and keep/see note 2)
Net *Dead Zero mV/V(Write this value down and keep/see note 2)
Zero Auto zero mV/V (AZM)
Mtn Zero pushbutton mV/V (PTZ)
Setpt Microvolt/count
Kg not allocated
Lb not allocated
NOTES:
1) mV/V values have .00001 resolution and have the nominal range of
[-.50000, 3.40000]
2) * values can be entered to reclaim calibration.
3) mV/V values are accurate to better than .5%(.2% typical)
4) Dead Zero entry shall clear PTZ and AZM
DISPLAY MESSAGES:
REINT: EEPROM is reinitialized automatically, one must recalibrate.
INIT: Typical load. (S1 is pressed while powering unit)
VEr x.xx: Firmware version
Btek: A/D initialization is occuring
A2D.Err: A/D Error. Trying to reinitialize A/D
EE.Err1: EEPROM not responding
EE.Err2: EEPROM verify failure
.A2D. : A/D internal calibration running
CAL.Err : Add more than 10% capacity of weight when calibrating.
OL: More than 103% capacity applied
UL: Less than –3% weight applied
A2D OL: Analog input is greater than 3.4mV/V
A2D UL: Analog input is less than –0.45mV/V
Page 11
BT84 CUSTOM SERIAL SETUP
Parameter 16 is the custom buffer selection in configuration
|DISPLAY |Serial output mode |
|16. Std |Prints out the standard format programmed in the indicator |
|16. Ct1 |Serial Tx1 is custom and will print in gross or net modes. Pressing EDIT buffer shall enter custom tx 1 |
| |edit/view. The buffer has an 80-step capability. |
Press edit buffer to view the buffer. The display has the format “X X - Y Y Y,” where “XX” is the step number from 1 to 80 and “YYY” is the ASCII / Display code value.
PUSHBUTTONS
Scrolling through configuration:
[pic]
|NEXT |LAST |EDIT BUFFER if ct1 is |SELECT |SELECT |
|PARAMETER |PARAMETER |selected |Std/Ct1 |Std/Ct1 |
When the EDIT BUFFER pushbutton is pressed, the pushbuttons assume the following functions:
|STEP |STEP |SHIFT |VALUE |VALUE DOWN |
|UP |DOWN | |UP | |
STEP UP: Next position in buffer
STEP DOWN: Last position in buffer
SHIFT: Other pushbuttons assume other functions (see below).
VALUE UP: Increase the value of the character/code.
VALUE DOWN: Decrease the value of the character/code.
Shift function:
|EXIT EDIT MODE |CLEAR |THIS IS PRESSED |DELETE |INSERT |
| |BUFFER | | | |
Page 12
|CODE SUMMARY |
|BASECODE |RANGE |DESCRIPTION |
|(Decimal) | | |
|0 |0 |End of Buffer- This must be at the end of the buffer string setup. |
|1 |0-31 |Standard, non printable ASCII codes. |
|32 |32-127 |Standard, printable ASCII codes. |
|*128 |128-135 |Displayed weight |
|*136 |136-143 |Gross weight |
|*144 |144-151 |Net Weight / (Peak weight when enabled) |
|*152 |152-159 |Tare weight |
|160 |160-167 |Not allocated |
|168 |168-175 |Not allocated |
|176 |176-183 |Not allocated |
|184 |184-191 |Not allocated |
|192 |192-199 |Not allocated |
|200 |200-207 |Not allocated |
|208 |208-215 |Not allocated |
|216 |216-223 |Not allocated |
|224 |224-231 |Not allocated |
|232 |232-239 |Not allocated |
|240 |240-247 |Time & date functions, see table on page 13. |
|248 |248-255 |Miscellaneous code functions, see table on page 13. |
Label YYY:
Note: * These codes can be formatted as shown in the table below.
For formatting options, add amount to the base code:
No label: Add 1
No units: Add 2
No CR/LF: Add 4
|Output |Code |
|Gross Wt. –123.456 lb |136 |
|–123.456 lb |137=136+1 |
|Gross Wt. –123.456 |138=136+2 |
|-123.456 |143=136+1+2+4 |
Labels: GROSS WT, TARE WT, NET WT:
Units: lbs, kgs
Page 13
TIME & DATE
|TIME & DATE CODES |
|CODE | | |Example |
|240 |DATE (format 1) |MM/DD/YY |01/12/00 |
|241 |DATE (format 2) |{month} {day}, {year} |January 12, 2000 |
|242-243 |Not allocated | | |
|244 |TIME |HH:MM:SS | 13:45:59 |
| | |HH:MM:SSAM / PM | 1:45:59PM |
|245-247 |Not allocated | | |
“30 tI” Time, press view (tare) to see current time.
“31 dA” Date, press view (tare) to see current date.
“32 tI” Prints time and date on standard print out if selected yes/no
“33 AM/PM” Selects between military time or 12 hr clock
Keyboard Operation for Time and Date Setup
[pic]
|NEXT |LAST |VIEW |NO FUNCTION |NO FUNCTION |
|PARAMETER |PARAMETER |TIME/DATE | | |
While setting time or date:
|EXIT or |EXIT or |EXIT or |SELECT DIGIT |VALUE |
|ABORT EDIT |ABORT EDIT |DONE | |UP |
1. Press view (tare) to view a dynamic time or date (T/D).
2. Press select digit (units) to select hours, minutes, seconds, month, date, or year (the selected value flashes).
3. Press value up (print) to increment the flashing value.
4. Repeat the last two steps for the other two T/D values. NOTE: Press done (tare) if not all three T/D values need to be entered.
5. Press exit (tare) to go back to configuration menu.
NOTE: Press ABORT EDIT to cancel editing the T/D, any changes made will not be stored.
|MISCELLANEOUS CODE FUNCTIONS |
|CODE |NAME |DESCRIPTION |EXAMPLE |
|248 |Transmit Status |Single character representation of the status of|, “O”, or “M” |
| | |applied weight | |
|249 |Single character units |Tx’s single L or K for weight units. |“L” or “K” |
|250 |Double character units |Tx’s lb or kg for weight units. |“lb” or “kg” |
|251 |Single character display mode |Tx’s single N or G for the displayed weight. |“N” or “G” |
| | |NOTE: This should be used only with displayed | |
| | |weight codes (128-135). | |
|252 | | | |
|253 | | | |
|254 | | | |
|255 |Transmit CR/LF | | |
Page 14
Custom Serial Worksheet
|Row Number |Code |Description |
|01 | | |
|02 | | |
|03 | | |
|04 | | |
|05 | | |
|06 | | |
|07 | | |
|08 | | |
|09 | | |
|10 | | |
|11 | | |
|12 | | |
|13 | | |
|14 | | |
|15 | | |
|16 | | |
|17 | | |
|18 | | |
|19 | | |
|20 | | |
|21 | | |
|22 | | |
|23 | | |
|24 | | |
|25 | | |
|26 | | |
|27 | | |
|28 | | |
|29 | | |
|30 | | |
|31 | | |
|32 | | |
|33 | | |
|34 | | |
|35 | | |
|36 | | |
|37 | | |
|38 | | |
|39 | | |
|40 | | |
|41 | | |
|42 | | |
| Row Number |Code |Description |
| 43 | | |
| 44 | | |
|45 | | |
|46 | | |
|47 | | |
|48 | | |
|49 | | |
|50 | | |
|51 | | |
|52 | | |
|53 | | |
|54 | | |
|55 | | |
|56 | | |
|57 | | |
|58 | | |
|59 | | |
|60 | | |
|61 | | |
|62 | | |
|63 | | |
|64 | | |
|65 | | |
|66 | | |
|67 | | |
|68 | | |
|69 | | |
|70 | | |
|71 | | |
|72 | | |
|73 | | |
|74 | | |
|75 | | |
|76 | | |
|77 | | |
|78 | | |
|79 | | |
|80 | | |
Page 16
ASCII CONTROL CODE CHART 1
|CONTROL |CONTROL |SYMBOLS |NUMBERS |
|CHAR |CODE |CHAR |CODE |CHAR |CODE |CHAR |CODE |
|NUL |000 |DLE |016 |SP |032 |0 |048 |
|SOH |001 |DC1 |017 |! |033 |1 |049 |
|STX |002 |DC2 |018 |“ |034 |2 |050 |
|ETX |003 |DC3 |019 |# |035 |3 |051 |
|EOT |004 |DC4 |020 |$ |036 |4 |052 |
|ENQ |005 |NAK |021 |% |037 |5 |053 |
|ACK |006 |SYN |022 |& |038 |6 |054 |
|BEL |007 |ETB |023 |‘ |039 |7 |055 |
|BS |008 |CAN |024 |( |040 |8 |056 |
|HT |009 |EM |025 |) |041 |9 |057 |
|LF |010 |SUB |026 |* |042 |: |058 |
|VT |011 |ESC |027 |+ |043 |; |059 |
|FF |012 |FS |028 |, |044 |< |060 |
|CR |013 |GS |029 |- |045 |= |061 |
|SO |014 |RS |030 |. |046 |> |062 |
|SI |015 |US |031 |/ |047 |? |063 |
Page 17
ASCII CONTROL CODE CHART 2
|UPPER CASE |UPPER CASE |LOWER CASE |LOWER CASE |
|CHAR |CODE |CHAR |CODE |CHAR |CODE |CHAR |CODE |
|@ |064 |P |080 |` |096 |p |112 |
|A |065 |Q |081 |a |097 |q |113 |
|B |066 |R |082 |b |098 |r |114 |
|C |067 |S |083 |c |099 |s |115 |
|D |068 |T |084 |d |100 |t |116 |
|E |069 |U |085 |e |101 |u |117 |
|F |070 |V |086 |f |102 |v |118 |
|G |071 |W |087 |g |103 |w |119 |
|H |072 |X |088 |h |104 |x |120 |
|I |073 |Y |089 |i |105 |y |121 |
|J |074 |Z |090 |j |106 |z |122 |
|K |075 |[ |091 |k |107 |{ |123 |
|L |076 |\ |092 |l |108 |} |124 |
|M |077 |] |093 |m |109 |~ |125 |
|N |078 |^ |094 |n |110 | |126 |
|O |079 |_ |095 |o |111 | | |
Page 18
[pic]
TO CHANGE PAPER ROLL
1. Slide the cover in the direction marked OPEN (it will only move a half inch)
2. Lift the cover off of the base.
3. Lift the LEFT end of the paper spindle first then remove the spindle.
4. Insert the end of the new roll of paper into the paper slot of the printer mechanism with the paper coming off the roll at the bottom as shown.
5. Use the paper feed switch to advance paper (at least three inches extend above the printer).
6. Place the spindle in the new paper roll with the two round shafts on the left end.
7. Insert the RIGHT end of the spindle in it’s holder first.
8. Snap the LEFT end of the spindle into position.
9. Feed the loose end of paper through the paper slot and locate the cover flush with the base at the position on half inch from the top. (See step 1).
10. Slide the cover in the direction marked CLOSE and snap it into position.
TO CHANGE THE RIBBON CARTRIDGE
1. Remove the cover as described in steps 1 and 2 above.
2. Use the paper feed switch to advance paper (at least three inches extend above the printer).
3. Press down on the left end of the ribbon (ribbon is marked PUSH)
4. Lift both ends to remove the old ribbon.
5. Turn the knob on the right end of the ribbon as needed to keep the ribbon tight while placing the new ribbon over the extended paper and snapping it down firmly into place.
6. Replace the cover as described in steps 9 and 10 above.
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