SERVICE MANUAL - Scalesexpress.com
Contents
1. 6 2 6 Specification Setting 7 2 7 Internal Count and A D Count Display 8 2 8 Specification List V1 04 8 2 9 System Display Information 10 Main Operation 3 1 System ON 11 3 2 One Touch Tare 11 3 3 Digital Tare Operation 11 3 4 Gross Net Display Toggle 12 3 5 Weight Unit Conversion AA AA AGA 12 3 6 Counting Operation 12 3 7 SEPINE Seting AA na aaeeea 13 3 8 Set Point Alarm Function 14 RS 232C Protocol 4 1 Communication Specs aa aaa Aa 16 4 2 Communication Text Command 16 4 3 Data Format 16 4 4 Communication Method A2. V1 04 e g With Header code and weight stability code Net weight 1 2340 Tare weight 0 450 and weight is stable Null CR 0 0 1 2 3 0 CR 4 0 0 0 4 5 O CR LF Note 1 The data format consists of header code minus plus sign numeric data and decimal point If weight data is minus 2DH is added after header data If weight is positive data 0 30H is output Note2 The data is aligned from right side Note3 When weight is over the capacity the following data is output Note4 By specification setting the decimal point can be set to period 2EH or comma 2CH 4 4 Communication Method Communication method can be set as Stream Output Manual and Command 4 4 1 Stream Output Continuously Output Data will output to PC side continuously Please also define the contents of data on SPEC 03 bit 0 amp 1 is not effective 4 4 2 Manual Command Data will output when key pressed user may select to output data right away or hold the command until weight stable by specification setting If weight is not stable within certain interval Error message ERR C will appear on the display PC Side DS 425 Side Manual Command Weight Stable 04 RS 232C Protocol Page No 17 DS 425 Service Manual V1 04 4 4 3 External Command Data will be output when DS 425 receives the command ACK 06H form PC PC send
3. H 80 mm Platter Size 105mm x 160mm 3009 205mm x 250mm 600g Upwards AC 220V 4 10 15 50HZ 60HZ Factory Set 0 C to 40 C lt 85 RH Atmal AT89C52 8bit Liquid Crystal Display With back light GD 584 NEC uPA7225G STB 0054 A D DS 422 New A D Cover Basic Weight Unit g kg Weight Unit Toggle g lb and oz kg lb and oz Counting Function RS 232C communication 01 General Specification Page No 2 DS 425 Service Manual 1 6 Layout and Function 1 6 1 Key Sheet and Function a Key Layout ON OFF RE ZERO TARE MODE ENTER SHIFT INC b Key Function On Off For turning the scale ON and OFF Re l Resetting the scale to zero For setting amp clearing tare value Mode Used to entry into the following modes Weighing mode or Counting mode Enter Used for storing the data Shift Used to change digital position 1 Used for increase data value when digit blinking INC 2 Switch the weight unit 1 6 2 Display a Layout b Indicators gt 0 lt Light when display is zero and stable NET Light when displays net weight Light when weight is stable U C Light when working in counting mode SAF Set point ALAME Mode is ON and during Fill Application SAC Set point ALAME Mode is ON At Check Weight Application 01 General Specification Page No 3 DS 425 Service Manual 3 Main Operation 3 1 Sy
4. Data Length 8 Parity Bit None 4 2 Communication Text Command Termination Code CR The end of data ODH LF The end of Text OAH Data 0 9 Numeric data 80H 39H Minus Minus sign 2DH Period Period 2EH Comma Comma 2CH Header Code 0 Net Weight 30H 4 Tare Weight 34H Stable sign Null Stable 00H SOH Un stable 01H 4 3 Data Format The SPECs to alter the supplement of header code and the status of weight stability are newly added to specification setting Header Code Selection SPECO2 Bit 0 Weight Stability Selection SPECO02 Bit 1 4 3 1 Without header code and weight stable code Total 17 Bytes Net Weight CR Tare Weight CR LF 7 Byte 1byte 7 Byte 1 Byte 1 Byte 4 3 2 Without header code and with weight stable code Total 19 Bytes Stable status CR Net Weight CR Tare Weight CR LF 1 Byte 1 Byte 7 Byte 1byte 7 Byte 1Byte 1 Byte 4 3 3 With header code and Without weight stability code Total 19 Bytes Header Net Weight CR Header Tare Weight CR LF 1 Byte 7 Byte 1byte 1 Byte 7 Byte 1Byte 1 Byte 4 3 4 With header and weight stability code Total 21 Bytes Stable Code CR Header Code Net CR Header Code Tare CR LF 1 Byte 1 Byte 1 Byte 7 Byte 1byte 1 Byte 7 Byte 1 Byte 1 Byte 04 RS 232C Protocol Page No 16 DS 425 Service Manual
5. digit selected Chang value INC INC Add 52 B Sample number 52 Confirm 0 0000 kg B B B Sample weight Load 52 samples 0 6000 kg BIB Weight for all samples Confirm 52 kg B B Counting mode Exit Mode 0 6000 kg B B Weighing mode 03 Main Operation Page No 12 DS 425 Service Manual 3 7 Set Point Setting SPEC8 BITO 1 Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 S1 8 82 9 53 10 54 Weight Stable 0 0000 kg B B Weighing mode Enter into Mode setting mode Mode SET 1 Set for Point1 1 Confirm Enter 0 0000 kg B Set value Shift key to select Shift the digit INC key to value change INC 9 0030 kg B change the value of digit selected 1 Confirm Enter SET 2 Set Point 1 saved Point 2 setting Enter 0 0000 kg B Set value 2 Shift Same method as Value change INC 0 0100 kg B point 1 setting 2 Confirm Enter SET 3 kg Point 2 saved 3 Confirm Enter 0 0000 kg B Set value 3 Shift Same procedure as Value Change INC 0 0100 kg B point 1 amp 2 setting 3 Confirm Enter SET 4 kg Point 3 saved 4 Confirm Enter 0 0000 kg B Set value 4 Value change ie 0 0100 kg B o megs 4 Point 4 saved and Confirm Enter 0 0000 kg B B back to weighing mode 4 Note 1 The indicators S1 S2 S3 S4 will be lighted when settin
6. Service Manual 3 4 Gross Net Display Toggle Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 S1 8 52 9 83 10 84 Weight Stable 0 0000 kg B B Weighing mode Tree HAN 0 6000 kg B Gross weight display Excute tare Tare 0 0000 kg B B Net display Toggle INC 0 6000 kg B Gross Weight display Remove item 0 0000 kg B B Weighing mode Toggle INC 0 6000 kg B B B Net weight Tare clear Tare 0 0000 kg B B Weighing mode Note The function is available when SPEC11 BITO 1 only This function will be unavailable when Weight Unit Conversion function is enabled 3 5 Weight Unit Conversion Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 S1 8 52 9 53 10 84 Weight Stable 0 0000 B B Weighing mode Load weight 0 6000 i B eg 0 6000kg g Convert INC 1 3225 Ib B Pound display Convert INC 21 165 bi B Ounce display Convert INC 0 6000 B Basic unit display Remove items 0 0000 p B B Weighing Mode Note This operation is available when SPEC15 0100 or 1100 only 3 6 Counting Operation Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 S1 8 52 9 53 10 84 Weight Stable 0 0000 kg B B Weighing mode Press MODE Mode Add 32 B Sample number 32 Change number Shift Shift Add 32 B 2
7. A SA AA 17 Hardware Specification 5 1 Main Components 19 5 2 Block Diagram 19 5 3 Electronic Connection Diagram 19 5 4 Circuitry Diagram 20 Page No 1 DS 425 Service Manual 1 General Specification 1 1 Overall Dimension 1 2 Display Panel 01 General Specification Page No 1 1 3 Main Feature 1 4 Model Display Resolution Internal Resolution Capacity Display Tube Weight display Weigh Unit Indicators Interface Load cell Mechanical Detail Physical Dimension Operation Condition Power Source Temperature Humidity Microcomputer Display Device LCD Display Drive A D Board 1 5 Main Function DS 425 Service Manual DS 425 1 1000 1 1500 1 2000 1 2500 1 3000 1 5000 1 6000 1 7500 1 10000 1 15000 1 20000 1 25000 1 30000 1 250000 1 300000 300g 600g 1 5kg 3kg 6kg 15kg 30kg Liquid Crystal With back light new design GD 584 8 Segment 6 Digit 4 Symbol kg g Ib oz 4 Set Point S1 S2 S3 S4 8 indicators for Zero Net Std U W U C MEM BATT PCS RS 232 OPTIONAL 300g K Type 600g 30Kg N Type Housing DS 425W DS 422 Keyboard L 321 W 256
8. V1 0 NIGI SERVICE MANUAL Model DS 425 Edition Month Year 1 September 1998 Shanghai Teraoka Electronic Co Ltd Technical Service Dept Ting Lin Industrial Development Zone Jin Shan District Shanghai P R China 201505 Tel 86 21 5723 4888 Fax 86 21 5723 9330 E mail steservice digi scale com DS 425 Service Manual V1 04 CONTENTS General Specification 1 1 Overall Dimension 1 1 2 Display Panel 1 1 3 Main Feature 2 1 4 Operation Condition 2 1 5 Main Function 2 1 6 Layout And Function 3 Initial Set Up 2 1 Stopper Screws 4 2 2 Adjustment 5 2 3 Location of the SPAN SW 5 2 4 Span Switch Check 6 2 5 Span Adjustment
9. a data request signal ACK to DS 425 side then DS 425 transmits the weight data to PC after received the request signal the weight data will be transferred immediately or hold the command till weight stable If weight cannot be stable within the certain interval set by specification DS 425 will transmit NAK 15H to PC Note If ACK signal is sent to DS 425 during digital tare or re zero operation NAK signal will be sent to PC PC Side DS 425 Weighing Mode 04 RS 232C Protocol Page No 18 DS 425 Service Manual V1 04 5 Hardware Specification 5 1 Main Components e Microcomputer ATMAL AT89C52 8 bit e LCD Display Driver NEC uPA7225G e A D Board STB 0054 FOR DS 422 New A D Cover 5 2 Block Diagram A D BLOCK STB 0054 3 MAIN BOARD BLOCK STB 0052 4 WITH OPERATE DISPLAY LOADCELL BLOCK INTERNAL 5 3 Electronic Connection Diagram RS 232 Interface Interface Driver Operator Display o Hp Display Driver Main CPU AT89C52 MCS51 Keyboard A D Block STB 0052 3 AC Input Scale Internal Block 05 Hardware Specification Page No 19 DS 425 Service Manual V1 04 5 4 Circuitry Diagram Please See Attached Pages for DS 425 Circuitry Diagram Technical Service Dept Shanghai Teraoka Electronic Co Ltd 05 Hardware Specification Page No 20
10. g the corresponding Set Point Note 2 When the weight exceeds the value of Set Point 1 the indicator S1 will light When the weight exceeds the value of Set Point 2 the indicator S1 and S2 are light When the weight exceeds the value of Set Point 3 S1 S2 and S3 are light When the weight exceeds Point 4 S1 S2 SI and S4 are light 03 Main Operation Page No 13 DS 425 Service Manual 3 8 Set Point Alarm Function This function has two methods Filling and Weight Check Method 3 8 1 Filling Method Operator fills the item on the platter up to the target weight range The target range is determined by 2 set point set point 2 and set point 3 and continuously fast alarm will be alert So operator can know the weight is within the target weight range Set point 1 and set point 2 may be programmed as a fine adjustment range The intermediate alarm notes to operator the weight is closed to target weight Near mini Target Mini Target Max Target Zero Set point 1 Set point 2 Set point 3 Set point 4 Full Span Note vv continuous slow alarm continuous fast alarm 3 8 2 Weight Check Method Operator places item on the platter and check confirm whether the weight of the item is within allowable error range Basically the allowable error range can be defined via the setting of 2 set points For example set point 2 and set point 3 And also you can set the range within point 1 till point 2 and point 3 till point 4 is out of allowable
11. range Then the operation can judge the weight error is allowable for not via the sound of alarm Out of Range Min Allowable Max Out of a Zero Set point 1 Set point 2 Set point 3 Set point 4 Full Span Note ec Continuous slow alarm Continuous fast alarm 03 Main Operation Page No 14 DS 425 Service Manual For Example Set point 1 0 0100kg Point 2 0 0200kg Point 3 0 0350kg Point 4 0 0550kg S Sparkling Indication Flag B Bright 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 S1 8 S2 9 S3 Weight Stable 0 0000 kg B B Weighing Mode Press Enter Enter 0 0000 kg B B B Filling application Load 0 0150kg 0 0150 kg B B B Fast alarm start Load 0 0150kg 0 0300 kg B B B Slow alarm start Load 0 0150kg 0 0450 kg B B B Fast alarm start Load 0 0150kg 0 0600 kg B B B Alarm off Remove all item 0 0000 kg B B B Press Enter Enter 0 0000 kg B B B Weight check method Load 0 0150kg 0 0150 kg B B B Fast alarm start Load 0 0150kg 0 0300 kg B B B B Slow alarm start Load 0 0150kg 0 0450 kg B B B B Fast alarm start Load 0 0150kg 0 0600 kg B B B B Alarm off Remove all item 0 0000 kg B B B Press Enter Enter 0 0000 kg B B Weight check mode 03 Main Operation Page No 15 DS 425 Service Manual V1 04 4 RS 232C Protocol 4 1 Communication Specs Baud Rate 2400 4800 9600 19200 Start Bit 1 Stop Bit 1
12. stem On Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 51 8 82 9 53 10 54 Press On Off On Off dS 425 Model Name Ur 1 00 Software Version 000000 Segment Checking 111111 999999 0 0000 kg B B Weighing Mode 3 2 One Touch Tare Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 51 8 82 9 53 10 54 Weight Stable 0 0000 kg B B Weighing mode Load tare weight on 1 2220 kg B Weight display Excute tare Tare 0 0000 kg B B Net display Load more 1 0000 kg B B weighing Remove all 1 2220 kg B B B Minus tare weight items Tare clear Tare 0 0000 kg B B Weighing mode Note This operation is based on No Auto TARE CLEAR SPEC10 BIT1 0 3 3 Digital Tare Operation Indication Flag B Bright S Sparkling 1 ZERO 2 NET 3 STD 4 U C 5 SAF 6 SAC 7 S1 8 52 9 53 10 84 Weight Stable 0 0000 kg B B Weighing mode Enter into tare AA setting mode Shift 0 0000 kg B B Right digit is blinking Shift Set tare value Shift 0 00100 kg B B Tare weight set INC Excute tare Tare 0 00100 kg B B B Minus tare weight Tare clear Tare 0 0000 kg B B Weighing mode Note This function is available when SPEC10 BIT2 1 only 03 Main Operation Page No 11 DS 425
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