For programming assistance please visit http://casio4business.com/sa_index.html CASIO Authorized Service Centers If your CASIO product needs repair, or you wish to purchase replacement parts, please visit http://casio- 4business.com. Original Carton/Package If for any reason, this product is to be returned to the store where purchased, it must be packed in the original carton/package.
Page 3
To use the cash register safely ....................E-4 To use the cash register’s basic function ................E-9 Getting started ..........................E-10 Getting to know your cash register ....................E-15 How to read the printouts ......................E-20 How to use your cash register ...................... E-21 Before opening your store ......................E-22 Registering items in departments ....................
To use the cash register safely • Congratulations upon your selection of this CASIO product. Be sure to read the following safety precau- tions before using it for the first time. After reading this guide, keep it close at hand for easy reference.
Page 5
Continued use of a damaged power cord can cause deterioration of the insula- tion, exposure of internal wiring, and short circuit, which creates the danger of electric shock and fire. • Contact CASIO service representative whenever the power cord or plug requires repair or maintenance. Caution •...
Page 6
To use the cash register’s basic function Caution Only use the specified batteries. • Do not disassemble, modify or short-circuit them. • Do not put them in fire or water or heat them. • Do not mix new and old batteries or different types of batteries. •...
Page 7
These are your sole remedies for any breach of warranty. In no event will CASIO’s liability exceed the license fee, if any, for such software. This warranty will not apply if the product has been misused, abused, or altered.
Page 8
This product is also designed for IT power Please keep all information for future reference. distribution system with phase-to-phase The declaration of conformity may be consulted at http://world.casio.com/ voltage 230 V. Laite on liitettävä suojamaadoituskostkettimilla vaurstettuun pistorasiaan Apparatet må tilkoples jordet stikkontakt Apparaten skall anslutas till jordat nätuttag.
To use the cash register’s basic function Getting started ......................E-10 Loading memory protection batteries ................E-10 Installing paper roll ......................E-11 Setting date, time, and tax table ..................E-13 Setting paper roll as journal records ................E-14 Getting to know your cash register ................E-15 General guide ........................
To use the cash register’s basic function Getting started This chapter shows how to setup the cash register and get it ready to operate. Loading memory protection batteries Important: These batteries protect information stored in your cash register’s memory when there is a power failure or when you unplug the cash register.
To use the cash register’s basic function Installing paper roll You can use the paper roll as receipts or journals (for business records). By default, your cash register is set as receipt printing. Please see page E-14 if you wish to use the paper roll for journals. The setting methods of the paper roll differ by the usage.
Page 12
To use the cash register’s basic function To install journal paper Repeat steps 1 through 5 of “To install receipt paper”. Using key, feed the paper about 20 cm Remove the paper guide of the take-up reel. Slide the leading end of the paper into the groove on the spindle of the take-up reel and wind it onto the reel two or three turns.
To use the cash register’s basic function Setting date, time, and tax table Plug in the power socket into a wall outlet. Be sure to check the rating plate on the side of the cash register to make sure that its voltage matches that of the power supply in your area.
To use the cash register’s basic function Setting paper roll as journal records By default, the printer of your cash register issues receipts. If you wish to use the printouts for sales jour- nals, please follow the procedures described below. Turn the Mode switch to PGM position and select [Paper Roll Setting] then press key.
To use the cash register’s basic function Getting to know your cash register General guide 1 Drawer 6 Main display 2 SD card slot cover 7 Mode switch 3 Printer cover 8 Com port connector cover 4 Printer 9 Drawer lock 5 Customer display Mode switch Use the mode keys to change the position of the mode switch and select the mode you want to use.
To use the cash register’s basic function Mode keys There are two types of mode keys: the program key (marked “PGM”) and the operator key (marked “OP”). The program key can be used to set the mode switch to any position, while the operator key can select the REG and OFF position.
To use the cash register’s basic function Display Main display During a registration CLERK001 000011 1 PLU001 $1.00 3 DEPT001 $6.00 SUBTOTAL $7.00 6.00 After finalization CLERK001 000011 1 PLU001 $1.00 3 DEPT001 $6.00 $7.00 CASH $10.00 $3.00 $3.00 $10.00 1 Mode/Clerk Number or name/Consecutive No.
To use the cash register’s basic function Keyboard RECEIPT SIGN % – ↑ ↓ — FEED CLK # HELP ON/OFF DEPT POST PRICE T/S 1 T/S 2 SHIFT/ ENTER RECEIPT DEPT# OPEN PLU/ S.DEPT #/ NS SUBTOTAL X/FOR/ DATE/ TIME CA/AMT TEND 0 00...
Page 19
To use the cash register’s basic function Department no. Use this key to input department numbers. Department shift: Use this DEPT SHIFT/ key to shift the department number from 1 through 25 to 26 through 50. DEPT# Use these keys to input numbers. 09'^ Use this key to sign clerk off the register.
To use the cash register’s basic function How to read the printouts • The journal/receipts are records of all transactions and operations. • The contents printed on receipts and journal are almost identical. • You can choose the journal skip function. If the journal skip function is selected, the cash register will print the total amount of each transaction, and the details of premium, discount and reduction operations only, without printing department and PLU item registrations on the journal.
To use the cash register’s basic function How to use your cash register The following describes the general procedure you should use in order to get the most out of your cash register. Before opening your store • Plugged in? (page E-13) •...
To use the cash register’s basic function Before opening your store Checking the time and date You can check the time or date on the display whenever there is no registration being made. Step Operation Display Press key to show the date and time on the display.
To use the cash register’s basic function Registering items in departments The following examples show how you can use the department keys in various types of registrations. Departments are used for categorizing items for example, department 01 for veg- etables, department 02 for fruits, and department 03 for canned foods etc. ...
Page 24
To use the cash register’s basic function Repeat registration Sample Operation Unit Price $1.50 Item Quantity Same priced multiple items are sold. Dept. Payment Cash $10.00 Step Operation Printout Enter the unit price. 1 DEPT001 $1.50 Press corresponding department 1 DEPT001 $1.50 key repeatedly for the purchased...
To use the cash register’s basic function Split sales of packaged items Sample Operation Unit Price 4 for $10.00 Item Quantity Three pieces of an item thats price is $10.00 for four pieces are sold. Dept. Payment Cash $10.00 Step Operation Printout...
Page 26
To use the cash register’s basic function Department number entry Without using Department key, you can register departments manually. Sample Operation Unit Price $13.00 Item Quantity Registering an item in Dept. 31 without using Department key. Dept. Payment Cash $13.00 Step Operation...
To use the cash register’s basic function Basic setups and registrations To program basic settings You can program basic settings in the PGM mode of the Mode switch. Step Display By turning the Mode switch to PGM position, the display indicates the programming top menu.
Page 28
To use the cash register’s basic function Top menu Sub menu What is to be set [Message Setting] 01 Logo 1 Sets logo, commercial, and bottom mes- sages on receipts. 02 Logo 2 See page E-58. 03 Logo 3 04 Logo 4 05 Commercial 1 06 Commercial 2 07 Commercial 3...
To use the cash register’s basic function Programming departments This section explains how you can set unit prices, taxable statuses, and item groups. You can program each department linking to a certain group. For ex- ample, department 01 is for packed milk, department 02 is for cheese and both belong to group 03 (dairy goods).
To use the cash register’s basic function The display returns to the previous screen by pressing key. Registering departments’ preset data The following examples explain the operations using preset department data programmed in the previous section. Using preset prices Sample Operation Unit Price $2.50...
To use the cash register’s basic function Programming PLUs Like departments, you can program unit price, taxable status, and linking item group in a PLU (Price Look Up). Using PLUs allow you to register items quickly and accurately. You can use up to 3,000 PLUs. Sample Operation Unit Price $2.50...
To use the cash register’s basic function The display returns to the previous screen by pressing key. Registering PLUs’ preset data The following examples explain the operations using preset PLU data pro- grammed in the previous section. Single item sales using PLU Sample Operation Unit Price $2.50...
Page 33
To use the cash register’s basic function PLU registration with multiplication key Sample Operation Unit Price $2.00 Item Quantity Ten pieces of PLU number 7 item (preset unit price $2.00) are sold. PLU No. Payment Cash $20.00 Step Operation Printout Enter the quantity sold then press key.
To use the cash register’s basic function Open PLU Although unit price is preset in a PLU, you can enter price manually if the PLU is programmed as “Open PLU”. To program open PLU, see page E-27. Sample Operation Unit Price $32.80 Item 1...
To use the cash register’s basic function Other registrations Discount The following example shows how you can use the key for discount registra- tions. Discounts on items and subtotals Sample Operation Dept. 01 $5.00 Item 1 Quantity Taxable 1 (preset) PLU 16 $10.00 (preset) Five percent (preset in...
To use the cash register’s basic function Reduction Using the reduction feature, you can subtract a certain amount from an item’s unit price or from a subtotal amount. Sample Operation Dept. 01 $5.00 Quantity Item 1 Taxable 1 (preset) Reduction $0.25 •...
To use the cash register’s basic function Registering various payment methods Other than cash payments, you can register transactions made by checks, charges, credits, or even mixed tendering. Check sale Sample Operation Unit Price $11.00 Item Quantity A $11.00 item is sold and customer paid by $20.00 check (check number 1234).
Page 38
To use the cash register’s basic function Credit sale Sample Operation Dept. 03 $10.00 Item Quantity A purchased item is paid by a credit card. Payment Credit $10.00 Step Operation Printout 10'#o Register the item purchased and press key. 1 DEPT003 $10.00 Press...
To use the cash register’s basic function Tax shift By using keys, you can change the taxable status. key switches on and off of programmed taxable status 1 and changes the taxable status 2. The following table explains how tax statuses change by key.
To use the cash register’s basic function Registering returned goods Registering returned goods in the REG mode The following example shows how to operate for registering goods returned by customer in the REG mode. Sample Operation Dept. 01 $2.35 Item 1 Quantity Dept.
To use the cash register’s basic function Registering returned goods in the RF mode When a customer returns goods after the transaction has been completed, use RF mode for the refund operation. Sample Operation Dept. 03 $4.00 Refunded Item 1 Quantity A customer returned two items.
To use the cash register’s basic function Registrations without transactions The followings are the operations other than normal sales transactions. Please do not perform these operations during a sales transaction. Registering money received on account Use this operation when you put money in the drawer without any sales transac- tions such case as preparing change.
To use the cash register’s basic function Corrections There are three ways to correct erroneous operations that are; • Correcting erroneous item not registered • Correcting erroneous item already registered • Cancelling all the items registered in a transaction Correcting erroneously entered item not registered Step Operation Printout...
Page 44
To use the cash register’s basic function Correcting items immediately after the registration Step Operation Printout Registering an item. 1 DEPT001 $1.00 2'"" By mistake, Dept. key has been 1 DEPT002 $2.00 pressed twice so cancelling the 1 DEPT002 $2.00 preceding registration by key.
Page 45
To use the cash register’s basic function Voiding an item which has been already registered Step Display During a registration. > Using keys, select the item you have mis- registered. Press key. The selected item is voided. Cancelling all items in a transaction Step Display Press...
To use the cash register’s basic function Daily sales reports At the end of the business day, you can print categorized and summarized results of the day. Reset report (Z) clears all the sales data whereas the data remains in memory by Read report (X).
To use the cash register’s basic function Print out of daily sales report Date/time Machine No./consecutive No. 20−06−2013 17:00 Report title 0001 000231 Department report title/reset counter −−−−−−−−−−−−−−−−−−−−−−−− Report code DAILY Z Department count/amount −−−−−−−−−−−−−−−−−−−−−−−− Department total count/total amount DEPT 0001 0001015 Fixed total report title/reset counter...
Page 48
To use the cash register’s basic function 26 Taxable 1 amount 27 Tax 1 amount 28 Taxable 2 amount $2,369.69 29 Tax 2 amount $128.86 30 Grand total $2,172.96 31 Function key report title/reset counter $217.33 32 Report code −−−−−−−−−−−−−−−−−−−−−−−− 33 Function key count/amount $00000000125478.96 −−−−−−−−−−−−−−−−−−−−−−−−...
Advanced programmings and registrations Enabling clerk assignment ....................E-50 Advanced registrations ..................... E-50 Registrations with clerk assignment................E-51 Single item cash sales ......................E-52 Using character keyboard ....................E-54 Character settings ..................... E-54 Using ten key pad ......................E-55 Setting characters ......................E-57 Setting pop messages on receipts ..................E-58 Setting symbol characters ....................E-60 Advanced programmings ..................
Advanced programmings and registrations Advanced registrations Enabling clerk assignment By assigning a clerk, clerk number or name will be printed on receipts. The fol- lowing operation enables the register to use the clerk assignment. Step Operation Turn the Mode switch to PGM position. The display shows programming top menu.
Advanced programmings and registrations Registrations with clerk assignment By signing a clerk on, the clerk name will be printed on receipts and sales re- ports. Step Operation Printout Enter the clerk number and press key. commercial message Perform registration operations. The clerk name is printed on 20−06−2013 11:58 0001...
Advanced programmings and registrations Single item cash sales A department key or a PLU programmed as single item sale status finalizes the transaction as soon as it is registered. This feature can be used only in cash sales. To program single item sales status see pages E-75 and E-76. Sample operation 1: Simple single item sale Dept.
Page 53
Advanced programmings and registrations Sample operation 3: Single item sale with another item Dept. 03 $2.00 Item 1 Quantity Preset Normal Dept. 03 is a normal department while dept. 01 is Dept. 01 $1.00 programmed as unit price $1.00 and single item sale status.
Advanced programmings and registrations Character settings This chapter explains how you can program department or PLU descriptions, store messages, key de- scriptions, report title, total descriptions (such as gross total, net total etc.) and clerk names. There are two ways to program characters which are using character keyboard and using multi typing of ten key.
Advanced programmings and registrations Using ten key pad To set characters by using ten key, you need to press one of the ten key repeatedly until desired charac- ter appears on the display. Multi typing keyboard SIZE SUBTOTAL SPACE PQRS WXYZ CA/AMT...
Page 56
Advanced programmings and registrations 2 Double size letter key Assigns the next input character to be double sized. After setting a double sized character, press this key again for normal size. 3 Space key Sets a space. 4 Clear key Clears all the characters.
Advanced programmings and registrations Setting characters The following explanation shows how you can set a name in a PLU. You can also set names to departments, function keys ( ), and clerks by the same method. Sample Operation To set “MILK” to PLU0001 by using ten key pad. Step Display Turn the Mode switch to PGM position.
Advanced programmings and registrations Setting pop messages on receipts You can set pop messages printed on receipts. Pop message 1st. line Pop message 2nd. line Pop message 3rd. line New Year Pop message 4th. line Sale 1st Anniversary Pop illustration 10% OFF ...
Page 59
Advanced programmings and registrations To set pop illustration Step Display Turn the Mode switch to PGM position and select [POP Set- ting] then press key. Select [All Graphic] and press key. The printer prints preset pop illustrations. From the printout, select an illustration you wish to print on receipts.
Advanced programmings and registrations Setting symbol characters You can change the symbols or titles of sales reports for example, printing “CASH IN DRW” on the sales reports instead of “CAID” for cash amount in drawer. Step Operation >▪▪▪▪▪>F Turn the Mode switch to PGM position and select [System Setting] then press key.
Page 61
Advanced programmings and registrations Sales report symbols Memory No. Program code Contents Default character Memo for your settings Gross total GROSS Net total Cash in drawer CAID Charge in drawer CHID Check in drawer CKID Credit 1 in drawer CRID(1) Credit 2 in drawer CRID(2) Credit 3 in drawer...
Advanced programmings and registrations Other symbols Numbers in ( ) are digits to be used. Memory No. Program code Contents Default character main currency symbol (2), @ (2), No.(2), split pricing (2), not used (4), sub currency symbol • @ N o / No.
Advanced programmings and registrations Advanced programmings This section explains how you can program detail settings of the register such as setting register’s spe- cific number, whether to reset consecutive number on the receipt after a Reset (Z) report or not, whether to print taxable amounts on receipts or not, etc.
Advanced programmings and registrations Programming detail settings To program the detail settings of the register, please follow the operations shown below. Step Operation >▪▪▪▪▪>F Turn the Mode switch to PGM position and select [System Setting] then press key. [System Setting] is the last column on the programming top menu and is not shown on the first screen.
Page 65
Advanced programmings and registrations Set code 04 (Tax system) Description Selection Program code Default value Canadian rounding system No = 0 º Roundings Last digit: 0 to 2 → 0, 3 to 7 → 5, 8 and 9 → 10 Yes = 7 US tax system = 1, Canadian tax system = 2 (Default value Select...
Page 66
Advanced programmings and registrations Set code 06 (Calculation and operation methods) Description Selection Program code Default value Succeeds the taxable status and commission status of previ- Yes = 0 ous item when +/ - operation is performed. No = 1 º...
Page 67
Advanced programmings and registrations Set code 08 (Fixed total print control) Description Selection Program code Default value Print gross sales total (GROSS) on fixed total report. Yes = 0 No = 1 Print net sales total (NET) on fixed total report. Yes = 0 º...
Page 68
Advanced programmings and registrations Example: • On the fixed total report, not printing gross sales total (a = 1), not printing net sales total (b = 2), not printing cash in drawer. (c = 4): D10 = 7 (1 + 2 +4 ). •...
Page 69
Advanced programmings and registrations Set code 15 (Printing methods of sales reports) Description Selection Program code Default value Department zero skip (Departments of sales amount zero are Yes = 0 not printed on sales reports.) No = 1 º (a+b) D10 (a+b) D10 Clerk zero skip (Zero amounted clerks are not printed on sales Yes = 0...
Page 70
Advanced programmings and registrations Set code 17 (Date/time printing on journals/receipts) Description Selection Program code Default value Print date on journal. Yes = 0 No = 2 º (a+b) D4 (a+b) D4 Print consecutive number on receipt/journal. Yes = 0 No = 4 Print time on receipt.
Page 71
Advanced programmings and registrations Set code 27 (Clerk operation selections) Description Selection Program code Default value Allow clerk functions. No = 0 º Yes = 4 º º º º Must be “00000000” D8 to D1 D8 to D1 Set code 30 (Thermal printer control) Description Selection Program code...
Advanced programmings and registrations Programming functions of departments and PLUs in a lump There are two methods to set functions of departments or PLUs which are programming at once and programming individual functions. Programming department functions in a lump This method programs function of a department at one time. Step Operation >▪▪▪▪▪>F...
Page 73
Advanced programmings and registrations Department and PLU lump set code Description Selection Program code Default value Single item sales: º 0 or 3 Normal item = 0, Single item = 3 Must be “0000” ºººº ºººº 0000 D11 D10 D9 D8 D11 D10 D9 D8 Taxable status 1 No = 0...
Advanced programmings and registrations Programming PLU functions in a lump This method programs functions of a PLU at one time. Step Operation >▪▪▪▪▪>F Turn the Mode switch to PGM position and select [System Setting] then press key. Enter and press key to set the register in the programming mode.
Advanced programmings and registrations Programming functions of departments and PLUs individually Programming functions of departments individually This part explains programming methods of each function of departments indi- vidually. Step Operation >▪▪▪▪▪>F Turn the Mode switch to PGM position and select [System Setting] then press key.
Page 76
Advanced programmings and registrations Set code table Set code Description Selection Program code Always “0” º Taxable status 1 No = 0 Taxable Yes = 1 status for Taxable status 2 No = 0 Taxable Yes = 2 (a+b+c) D1 status Taxable status 3 No = 0...
Advanced programmings and registrations Programming functions of PLUs individually This part explains programming methods of each function of PLUs individually. Step Operation >▪▪▪▪▪>F Turn the Mode switch to PGM position and select [System Setting] then press key. Enter and press key to set the register in the programming mode.
Advanced programmings and registrations Programming functions of transaction keys This section explains how you can program functions in each transaction keys such as F, keys. For example, programming key to force entry of tendered amount. Step Operation >▪▪▪▪▪>F Turn the Mode switch to PGM position and select [System Setting] then press key.
Page 79
Advanced programmings and registrations Program code for keys Description Selection Program code Maximum amount. Maximum value (0 ~ 9) e.g.) $10,000; D4 = 1, D3 = 4. D4 D3 Number of zeros (0 ~ 9) Must be “00” ºº D2 D1 Example: To set key not allowing to enter more than $900.
Page 80
Advanced programmings and registrations Program code for Description Selection Program code Always “0” º Taxable status 1 No = 0 Taxable Yes = 1 status for Taxable status 2 No = 0 Taxable Yes = 2 (a+b+c) D7 status Taxable status 3 No = 0 Yes = 4 Taxable...
Page 81
Advanced programmings and registrations Program code for Description Selection Program code Multiplication procedure ! = 0 ! Quantity × Amount, @ Amount × Quantity @ = 1 Roundings: Round off = 0, Cut off = 1, Round up = 2 0, 1, or 2 Must be “0000”...
Advanced programmings and registrations Programming further clerk functions This section explains how you can set further programming for clerks such as setting the register in training mode or setting commission rates given to clerks. In the training mode, the register operates normally but the results will not be stored in the memory.
Advanced programmings and registrations Printing programmed data After programs have been set, you can print the programmed data. To print programmed unit price or percentage (other than PLU) Step Turn the Mode switch to PGM position and select [System Setting] then press key.
Advanced programmings and registrations To print programmed characters (except PLUs) Step Turn the Mode switch to PGM position and select [System Setting] then press key. Enter and press key. Press key again. The printer starts to print preset data. Printout 1: Program read symbol 2: Fix total character P02 ....
Advanced programmings and registrations To print general programming (except PLUs) Step Turn the Mode switch to PGM position and select [System Setting] then press key. Enter and press key. Press key again. The printer starts to print preset data. Printout 1: Program read symbol 2: Transaction key program P03 ....
Advanced programmings and registrations To print preset characters of PLU Step Printout Turn the Mode switch to PGM position and select [System Setting] then press key. P02 ....Enter and press key to set the register in the programming mode. #0001 −...
Advanced programmings and registrations Printing various sales reports You can print categorized sales reports such as PLU sales report, item group sales report, hourly sales report etc. • Please do not perform the reset (Z) report during the business hour as it clears stored sales data from the memory.
Advanced programmings and registrations Periodic sales report Apart from daily report, you can obtain periodic sales report. The register prints total sales data from the last periodic report. Namely, if you do this operation monthly, you can obtain monthly sales reports. The cash register allows you to obtain two kinds of periodic reports so that not only monthly reports, you can also get weekly reports.
Page 93
Advanced programmings and registrations Report title Department report title/reset counter −−−−−−−−−−−−−−−−−−−−−−−− Report code PERIODIC 1Z −−−−−−−−−−−−−−−−−−−−−−−− Department Name/No. of items DEPT 0001 Sales ratio/amount 0001115 Total No. of items Total amount DEPT001 Fixed total report title/reset counter 8.13% $ 257.53 DEPT002 Report code 10 Gross total...
Page 94
Advanced programmings and registrations Function key report title/reset counter Report code −−−−−−−−−−−−−−−−−−−−−−−− Function key count/amount TRANS 0001 0001112 Clerk report title/reset counter CASH Report code $1,638.04 Clerk name CHARGE Net total $1,174.85 Clerk name $810.00 $5.00 CORR $39.55 −−−−−−−−−−−−−−−−−−−−−−−− CASHIER 0001 0001117 ....1...
Advanced programmings and registrations Using an SD card You can store sales data or program data to an SD card or you can restore the data from SD card to your cash register. The following table explains what you can do with an SD card. [Backup→SD] Stores sales data and program data of register to SD card.
Advanced programmings and registrations Step Display Select [YES] and press key. The register starts to format the SD card. Now the SD card is formatted and you can use it for storing cash register data in it. To store program data in an SD card The following operation explains how you can back up all the program data in an SD card.
Page 97
Advanced programmings and registrations Step Display Select [YES] and press key. After for a while, the display indicates “Backup complete”. E-97...
Advanced programmings and registrations Before you consider it as a problem Error code table Error code Message Meaning Action E001 Wrong mode Mode switch position changed Return the mode switch to its before finalization. original setting and finalize the operation. E003 Wrong operator The signed on clerk differs from the...
Page 99
Advanced programmings and registrations Error code Message Meaning Action E050 DETAIL memory full Check tracking detail memory full. Finalize and close the check num- ber currently used. E051 CHK/TBL No. is occupied Attempt to made use <New Check> Finalize and close the check that is to open a new check using a currently under the number that you number that is already used for an...
Advanced programmings and registrations When “EJ FULL” sign appears on the display When the register shows this sign, issue electronic journal read report (if necessary) and reset the memory immediately. In case of power failure If the power supply to the cash register is cut by a power failure or any other reason, simply wait for power to be restored.
Page 101
Advanced programmings and registrations About the low battery indicator If this indicator appears when you switch the cash register on, it can mean one of three things: • No memory backup batteries are loaded in the cash regis- ter. • The power of the batteries loaded in the unit is below a certain level.