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ba_aed104_8_e.doc

5.1 Transducer

Connection

AD104

4

1-Ub
2-GND
3
4
5
6

n.c.
U

Br

2

IN4
IN1
U

Br

3

n.c.

Fig. 5.1:

Transducer connection with the PCB (n.c. - not connected)

The AED amplifier is allready mounted with the transducer. A changing of the modules (AED or transducer) is

only allowed in HBM factory.
For the transducer connection a 4 core

shielded

cable has to be used.

Connection Pads for a full bridge:

Pad

Discription

U

Br

2

bridge excitation 2

IN4

amplifier input 4

IN1

amplifier input 1

U

Br

3

bridge excitation 3

Notes on cable length:

The connection between load cell and electronics should be as short as possible. Depending on the bridge
resistance of the transducer used, line length, and line cross-section of the transducer connection cable, voltage
drops arise that lead to a reduction in the bridge supply voltage. Additionally, the voltage drop on the connection
cable is also temperature-dependent ( copper resistance ). The transducer output signal also changes in
proportion to the bridge supply voltage.

With the 4-wire circuit used, there still result measurement errors in conditions with changing temperatures,
caused by the temperature-dependent cable resistance and possibly also by transitory resistances in the
connectors.

When setting up a measurement chain (electronics outside the transducer) it should also be noted that the
AD104 uses a rectangular carrier frequency for bridge supply. Therefore, the cable length between AD104 and
the transducer is limited to 100 cm max. For high precision applications(>= 3000d), the length should be
reduced to 30cm (shielded cable, shield connection on the measuring body and on the shielded housing for
AD104).

5.2

Serial Interface RS-232 (only AD104-R2)

The

AD104-R2

is a version of the AD104 with an asynchronous, serial interface (UART interface with RS-232

line driver). This interface provide a point – to – point communication (no bus mode).
The baud rate of 1200...38400 baud can be selected for this interface. The following specifications result for the
transmission of one character:

Start bit:

1

Number of data bits:

8

Parity bit:

none / even

Stop bit:

1

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Содержание AD104-R2

Страница 1: ...Operating instructions Digital Transducer Electronics AD104 R2 AD104 R5...

Страница 2: ...with AD104 R5 11 6 Command set 14 6 1 Command format 14 6 2 Answers to commands 15 6 3 Output types for the measured values 15 6 4 Command overview 16 7 Individual descriptions of the commands 17 7 1...

Страница 3: ...ell Avoid the penetration of dirt and moisture into the interior of the unit when connecting the cables When connecting the cables take measures against electrostatic discharges which can damage the e...

Страница 4: ...face Interface Connect Bus mode Cable length external Trigger AD104 R2 Asynchronous serial RS 232 duplex no 15m yes AD104 R5 Asynchronous serial RS 485 4 wire full duplex yes 500m yes The transducer e...

Страница 5: ...With digital transducers FIT C16 the AD104 is build in the housing of the load cell For digital measuring chains the AD104 is included in a separate housing in the cable degree of protection IP 40 War...

Страница 6: ...AD104 block circuit diagram The analog transducer signal is initially amplified filtered and then converted into a digital value in the analog digital converter The digitized measuring signal is proce...

Страница 7: ...ion the signal is filtered by adjustable digital filters command ASF The factory characteristic is determined with the aid of the commands SZA and SFA The measuring signal bandwidth digital filter is...

Страница 8: ...value has been created After retrieving the contents of the measured value memory by means of the MAV command this memory is reset to an invalid condition invalid value 1600 000 The periods stop time...

Страница 9: ...32 1 red UB UB 2 white GND GND 3 blue TA RxD 4 green RA TRG 5 black TB TXD 6 grey RB GND 7 yellow TRG 8 do not connect The measuring chain of HBM with AD104 R5 has a 8 wire shielded cable The measurin...

Страница 10: ...cs should be as short as possible Depending on the bridge resistance of the transducer used line length and line cross section of the transducer connection cable voltage drops arise that lead to a red...

Страница 11: ...signal also changes in proportion to the bridge supply voltage With the 4 wire circuit used there still result measurement errors in conditions with changing temperatures caused by the temperature de...

Страница 12: ...B supply voltage 5 6V 15VDC Ground GND GND Ground Ext trigger TRG external trigger signal The levels on the RxD and TxD lines are RS 232 levels whereby the quiescent signal level is 3V Low External tr...

Страница 13: ...connection of the bus to the RS232 RS485 Converter HBM Ordering No 1 SC232 422A Figure 5 3 3 shows the RS485 bus connection The terminating resistors of 500 ohms drawn in Figure 5 3 3 for the electri...

Страница 14: ...s The quiescent signal level on the RS 485 master line results in the 4 wire mode at TB TA 0 35 V quiescent signal level due to the AED terminating resistors RB RA 0 35 V quiescent signal level due to...

Страница 15: ...and must be entered Parameters in pointed brackets are optional and can also be dispensed with The brackets themselves are not entered Text must be included in With numerical entries leading zeros ar...

Страница 16: ...sured value n CRLF The measured value query works with fixed output lengths see command COF Format command AED answer Number of bytes COF0 msv yyyy CR LF y binary 6 COF2 msv yy CR LF y binary 4 COF3 m...

Страница 17: ...SV Measured value output 36 NOV x x Nominal value scaling 34 RES Reset 49 S Select of AED in bus operation 26 SFA x Internal nominal value factory characteristic 30 SPW Password entry 48 STP Messwerta...

Страница 18: ...low Fig 7 1 1 Composition of a character Since the data are transmitted after one another the transmission speed must agree with the reception speed The number of bits per second is called baud rate T...

Страница 19: ...ber 0 31 The serial number can also be stated optionally as 2nd parameter The new address is then entered only for the AED with the stated serial number This makes it possible to change device address...

Страница 20: ...is given in the new setting baud rate parity Communication is no longer possible initially after a changed baud rate The computer must also be changed over to the newly selected baud rate setting So t...

Страница 21: ...them are listed in the following Table The measured value output refers here to the set nominal value of the AED see command NOV Output at max capacity NOV 0 NOV 0 2 Byte binary NOV value 20000 4 Byte...

Страница 22: ...4 Byte LSB before MSB LSB 0 no Status COF6 Measured value 2 Byte LSB MSB COF8 Measured value 4 Byte MSB before LSB LSB Status CRC COF12 Measured value 4 Byte LSB before MSB LSB Status CRC ASCII forma...

Страница 23: ...ss new setting for 1st AED Binary measured value output without CRLF COF32 to COF44 If the decimal number 32 is added to the above stated binary output formats COF0 COF12 the AED is switched into the...

Страница 24: ...The AD104 can output a maximum of 100 measured values per second This data rate also depends upon the baud rate BDR the data format of the measured value output and the set averaging ICR Table 1 shows...

Страница 25: ...t CSM 0 1 Query CSM Effect The adjusted fuction is given out as 0 1 The command checksum can be used to find out transmitting errors within 4 Byte binary output If CSM 0 the normal status will be tran...

Страница 26: ...7FH can be taken as data delimiter The data delimiter is set between the parameters in the measured value output see also commands MSV and COF Example TEX44 Measuring value output 0123456 12 000 01234...

Страница 27: ...lected AED answers only together with a further command Except in the bus mode COF16 COF28 after MSV 0 Example S00 Command 1 Command 2 n S01 Command 1 etc The command S98 is provided for special funct...

Страница 28: ...In the following the balance of a measuring chain will be described with the balancing of a scale This example can also be used for other kinds of transducers Important Note The characteristic command...

Страница 29: ...nter password Load 0 scale Load Nominal value scale Load in mV COF3 1 000 000 User characteristic Digit 0 2 I II 1 4 Application measuring range Load in mV Factory characteristic 1 000 000 Digit COF3...

Страница 30: ...but only starts the calculation of the new characteristic after entering the parameter for SFA Input SZA zero value Response time 15ms Effect Instead of causing the AED to measure the applied signal...

Страница 31: ...ime 15ms Effect The value used in the AED for calculating the factory characteristic for the zero point is output in 7 digits e g 0915345CRLF Important Note Entry the command SZA and SFA ore execute T...

Страница 32: ...0 1000000 This characteristic is converted into the NOV by means of the parameters Example NOV 0 User setting 0 1000000 ASCII signal with 0 unloaded scale 1000000 at nominal load NOV 4000 User setting...

Страница 33: ...sures an input signal between 2 5mV V i e measured value for scale in no load condition stores the measured value but only starts the calculation of the new user characteristic after entering the para...

Страница 34: ...ser characteristic via LWT Input LWT Nominal value Reaktionszeit 1 5s Instead of causing the AED to measure the applied signal the value for the end value of the user characteristic is entered here di...

Страница 35: ...is deactivated The ASCII measured value output is scaled to 1000000 at the factory If a measured value output of 2000 digit at nominal load is required then use this command to set the nominal value...

Страница 36: ...ng All commands acting directly on a measured value belong to measuring these are MSV Measured value output STP Stop measured value output ASF Filter setting FMD Filter mode ICR Measuring rate TAR Tar...

Страница 37: ...rameter protect Output measured values Query MSV 0 not to be used in 2 wire connection Effect Outputs measured values constantly until the output is stopped with the command STP Query MSV 1 65535 Effe...

Страница 38: ...length for the command MSV depends in this case upon the output format see COF command Output format AED answer No of characters Binary 4 Byte yyyy CRLF y bin r 6 Binary 2 Byte yy CRLF y bin r 4 ASCII...

Страница 39: ...ut of two measured values The end identification CR LF is output only for the last measured value The total time for the acquisition of P1 measured values is calculated as Measuring time ms P1 2ICR 10...

Страница 40: ...AD104 R5 39 75 ba_aed104_8_e doc STP Stop Stop of the measured value output The measured value output is ended with this command STP acts only on the command MSV A started measured value is output co...

Страница 41: ...t through the two commands ASF ICR Further new efficient digital filters have been implemented apart from the standard filter properties The command FMD is used for switching over between the two filt...

Страница 42: ...45 80 15 6 20 4 9 5 12 45 85 12 5 7 22 3 5 8 10 40 85 10 8 22 3 7 8 40 80 8 The filter is switched off with ASF0 The filters ASF6 ASF8 are limited additionally in bandwidth by averaging ICR 4 The tra...

Страница 43: ...0 Response time 15ms Parameters 1 Password protection none Parameter protect with command TDD1 Input FMD 0 1 Entry of the filter stage as decimal number of 0 or 1 Query FMD Effect Output of the set f...

Страница 44: ...the response time to the measured value query with the command MSV ICRx Averaging over 2x measuring values with x 0 7 The following setting possibilities result from this ICR Output rate Mv s 0 100 1...

Страница 45: ...rotection none Parameter protect no data to be protected The current measured value is tared with the command TAR After taring the system switches over to Net measured value TAS0 The current value is...

Страница 46: ...rted to the NOV value Output format measured value at nominal load Nominal taring range at NOV 0 Maximum taring range at NOV 0 Nominal taring range at NOV 0 Maximum taring range at NOV 0 2 Byte binary...

Страница 47: ...e 10ms Parameters 1 Password protection none Parameter protect with command TDD1 Input TAS 0 1 TAS0 Net measured value The value in the tare memory is subtracted from the current measured value TAS1 G...

Страница 48: ...7 Letters or numbers ASCII characteristics Factory setting AED Response time 80ms Parameters 1 Password protection none Parameter protect with input Input DPW Password The user can enter an arbitrary...

Страница 49: ...W Passwd The command SPW with the correctly entered password authorizes data entry with all commands The command SPW with a wrong password disables the data entry for protected commands No password is...

Страница 50: ...tting Response time 3s Parameters Password protection none Parameter protect no data to be stored The command RES produces a warm start This command generates no answer All parameters are set as they...

Страница 51: ...rs 1 Password protection none Parameter protect with input Input ENU abcd Entry of a unit An arbitrary unit with max 4 characters can be entered If less than 4 characters are input the entry is supple...

Страница 52: ...marks If only the serial number has to be changed a comma is entered for the transducer type parameter e g IDN 0815 The serial number is entered by the factory and may have maximum 7 characters it is...

Страница 53: ...D2 none Parameter protect no data to be protected Input TDD 0 Cold start the parameters are reset to the factory settings see table next page After balancing the adjustments will be stored in the seco...

Страница 54: ...program version LIC no change Linearization switched off all par 0 LFT0 LFT Legal for trade switched off LDW0 LDW0 User characteristic zero point LWT1000000 LWT1000000 User characteristic fullscale v...

Страница 55: ...ut data delimiter TRC Trigger function ZSE Initial zero setting ZTR Automatic zero tracking Command TDD 2 Effect Transfer of the parameters from the EEPROM into the RAM The parameters listed under TDD...

Страница 56: ...ing will be executed within the selected range at a standstill If there is no standstill or if the gross value is outside the selected limits there will be no zero setting The internal zero memory is...

Страница 57: ...effected at a gross value of 1d within a range of 2 from the nominal value NOV of the scale The maximum adjustment velocity is 1 d second when the scale is at a standstill Scale standstill is fixed at...

Страница 58: ...teristic determined by the command pair SZA SFA is initially determined in 2 points Using the AED the linearity fault of a scale can be compensated The AD104 comprises a 3rd oder polynomial for linear...

Страница 59: ...d Query MAV Effect If a new trigger measured value has been formed this measured value will be output once If no new measured value has been formed the output value is the overflow value binary 80000h...

Страница 60: ...ameter protect with command TDD1 Input TRC P1 P2 P3 P4 P5 P1 Trigger function On Off 0 Off 1 On P2 Trigger typeart 0 Level triggering 1 External trigger input IN1 P3 Trigger level 0 NOV Trigger level...

Страница 61: ...6 16 10 ms if ICR 0 Example 2 ICR1 ASF3 total settling time 160 ms P4 8 8 20 ms if ICR 1 The measuring time P5 provide an additional averaging P5 6 averaging over 6 values The external trigger will on...

Страница 62: ...ng possible i after each Trigger event the result is given out automatically without MAV command 4 Stop the automatical measuring value output with STP command 5 nonvolatile storage of automatic outpu...

Страница 63: ...d as 3 digit decimal number The occurring errors are linked by Or Error message Error 000 No error 004 Not used 008 Device Dependent Error Hardware error e g EEPROM error 016 Execution Error error at...

Страница 64: ...s termination switched on The necessary measures for the electrical bus termination resistors were described in Section 5 3 These resistors protect the zero signal level on the master line if none of...

Страница 65: ...CRLF Befehl LFT0 1 Effect 0 legal for trade off default 1 legal for trade on If LFT is changed each change of the following parameters will increase the trade counter TCR With LFT1 legal for trade app...

Страница 66: ...ery TCR Effect xxxxxxxx CRLF 8 characters CRLF This is a none resetable counter for legal for trade applications If LFT is switched on each change of the parameters will increment the trade counter se...

Страница 67: ...LF Input CRCxxxxx Effect 0 CRLF This command can be used to calculate external in the master a checksum over all parameters of the AED So it is easy to check if one or more parameters has been changed...

Страница 68: ...e contained in the AD104 only for compatibility reasons They have no function in the AD104 ACL Query ACL Answer AED 0 GRU Query GRU Answer AED 32 COR Query COR Answer AED 0 1 ASS Query ASS Answer AED...

Страница 69: ...AED with the new address S01 Store address nonvolatile with the command TDD1 Connect next AED to the bus output S31 set ADR02 etc or 2 All AED are interfaced to the bus Read off manufacturing number o...

Страница 70: ...nted baud rate wait approx 150ms 7 Set the baud rate of the master interface to 38400 Bd 8 data bits 1 parity bit even 1 stop bit 8 Output of the command string clears the input buffer of the AED S98...

Страница 71: ...ters or no characters are received by the master then there can be a bus fault or multiple occupancy of the address The bus master must react accordingly 4 Repetition of item 2 with the following addr...

Страница 72: ...en transmit a new select command in this case if the measured value has been received Query time Number of all characters x Time for one character Response time AED Baud rate Output format Measured va...

Страница 73: ...the measuring sensitivity related to the nominal value 0 002 0 005 Serial Interfaces electrical level AD104 R2 RS232 electrical level AD104 R5 RS485 differential V V Low 3 12V High 3 12V Low B A 0 35...

Страница 74: ...ral form They are not to be understood as express warranty and do not constitute any liability whatsoever Hottinger Baldwin Messtechnik GmbH Postfach 100151 D 64201 Darmstadt Im Tiefen See 45 D 64293...

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