HBM AD104-R2, AD104-R5 Operating Instructions Manual

Operating instructions

Digital TransducerElectronics

AD104-R2, AD104-R5

Contents Page

Safety notes ..........................................................................................................................................2

1 Intended use................................................................................................................................3

2 Characteristic features ...............................................................................................................3

3 Mechanical construction ............................................................................................................4

4 Electrical construction ...............................................................................................................5

4.1 Function ...............................................................................................................................5

4.2 Signal processing ................................................................................................................6

Electrical connection ...........................................................................................................................8

5.1 Transducer Connection .....................................................................................................10

5.2 Serial Interface RS-232 (only AD104-R2).......................................................................... 10

5.3 Serial Interface RS485 (Bus mode 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 Interface commands (asynchronous, serial)...................................................................... 17

7.2 Adjustment and scaling......................................................................................................27

7.3 Measuring ..........................................................................................................................35

7.4 Special functions................................................................................................................47

7.5 Error messages .................................................................................................................62

7.6 Bus termination for RS-485 version................................................................................... 63

7.7 Commands for Legal for trade Applications....................................................................... 64

7.8 Further commands.............................................................................................................67

7.9 Examples of communication.............................................................................................. 68

8 Technical data ...........................................................................................................................72

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Safety notes

• In the normal case the product causes no dangers, provided the notes and instructions for configuring,

installation, operation as intended and maintanance are complied with.

• The safety and accident prevention regulations applicable corresponding to the application must be

observed without fail.

• Installation and commissioning may be performed exclusively by qualified personell.

• 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

electronic unit.

• An extra low voltage with safe isolation from the mains is required for the power supply of the unit.

• When connecting additional devices, the safety regulations according to EN610101) must be complied with.

• Shielded cables are required for all connections. The shield must be connected flatly with ground at both

ends.

1) "Safety regulations for electrical measuring, control and laboratory equipment”

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1 Intended use

The digital sensor electronic units AD104 belong to the family of AED components which digitally condition and network as bus-capable signals of mechanical measured value transducers. The objective of these components is the digitization and conditioning of the measuring signals directly at the transducer. The AD104 and the transducer (load cell) form a unit and cannot be replaced separately (transducer calibration of the measurement chain with SZA/SFA is necessary).

As transducers, calibrated load cells or force transducers ( adjusted in TCZ,TCS, and zero point) can be used.

The measuring amplifier boards AD104 have different interface connections which are produced in the factory by corresponding assembly:

AD104-Type Interface Interface

Connect.

AD104-R2 Asynchronous,

serial

AD104-R5 Asynchronous,

serial

The transducer electronic units AD104 are also abbreviated with AED in the following text. Old type: AD104-R4 Æ new type: is AD104-R5 with external trigger

New type: AD104-R2 with external trigger and RS232 interface.

RS-232 duplex no < 15m yes

RS-485 -4-wire,

full duplex

Bus mode Cable length external

Trigger

yes < 500m yes

2 Characteristic features

• Operating voltage 5.6V...15V DC

• 4 wire Interface for a full bridge sensor, nominal input range ±2 mV/V, maximal input range ±2.6 mV/V

• Serial interface RS-485 (bus mode) or through RS-232 interface (point - to - point mode)

• Digital filtering, choice of the output speed and scaling of the measured signal

• Separated calibration of transducer and application characteristic

• Storage of the parameters nonvolatile

• All settings are made through the serial interface

• Automatic zero tracking (1d/s, ±2%)

• Automatic intial zero setting (±2%...±20%)

• Trigger functions (level or external trigger)

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3 Mechanical construction

Load Cell

30 cm

AD104

1m...500m (depending on the type)

Pancon connector female

Shield

Fig. 3.1: Example of a mechanical construction of a measuring chain (HBM)

The amplifier circuit board has to be placed in a shielded housing (EMC protection). The cable connections has to be shielded leads.

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).

Warning: The AD104 board is not protected against electrostatic discharges. Appropriate safety

precautions must be taken for handling during assembly into the transducer.

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4 Electrical construction

The circuit of the digital transducer electronic unit consists essentially of the following functional groups:

• Transducer supply

• Amplifier

• Analog-digital converter (A/D)

• Microprocessor unit (µP)

• Parameter memory (EEPROM) protected against power failure

• Serial interface (RS232- 2 wire or RS485)

• Power supply

• Trigger input

4.1 Function

Transducer

supply

Fig. 4.1: Measuring amplifier board AD104 block circuit diagram

EEPROM

Identifica tion., D igital filter, M e a s. rate , S ca ling Interface s etting

µP

Interfac e

Voltage stabilize r

AD 104

RS-4854-wire

RS232

5.6 ...15V

< 60mA

Ext. Trigger

1200...38400 baud

The analog transducer signal is initially amplified, filtered and then converted into a digital value in the analogdigital converter. The digitized measuring signal is processed in the microprocessor. The conditioned signal is then transmitted to a computer through the serial interface. All parameters can be stored in the EEPROM, protected against power failures.

Power unit

Com puter

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The transducer electronic unit is adjusted in the factory to the no-load and the nominal load of the transducer. The electronic unit determines a factory characteristic through the commands SZA and SFA from these measured values and images the measured values following later by means of this characteristic.

The following measured values are delivered according to output format (COF):

Output format Input signal Measured values

NOV = 0

Binary 2 characters

(Integer)

Binary 4 characters

(Long Integer)

ASCII 0...Nominal load 0 ... 1 000 000 Digit 0 ... NOV

You have the possibility of adapting the characteristic to your requirements (i.e. scale characteristic) correspondingly with the parameter pair LDW and LWT and to standardize the measured values to the required scaling value (e.g. 3000d) via the command NOV.

0...Nominal load 0 ... 20 000 Digit 0 ... NOV

0...Nominal load 0 ... 5 120 000 Digit 0 ... NOV

Measured

values at

NOV > 0

Delivery status

NOV=0

4.2 Signal processing

Gross measured value

Net measured value

Measuring bridge

mpli-

fier

FMD

ASF

Filter

ICR

Measur. rate

SZA SFA

Factory scaling

LDW

NOV

LWT

User scaling, Linearization ZTR, ZSE

LIC

TAV, TAS

Net

TAR

Fig. 4.2.1: Signal flow diagram

After amplification and AD conversion, 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 set with the command ASF. The measuring rate (number of measurements per time unit) can be changed depending upon the filter bandwidth with the command ICR.

The user can set his own characteristic (commands LDW, LWT, NOV) without changing the factory calibration (SZA/SFA). Furthermore, gross/net switch-over is available (command TAS). Using the command ZSE an automatic switch-on zero setting can be activated. An automatic zero tracking function (ZTR) is also available.

For a linearization of the scale characteristic, the command (LIC) is available (with a polynomial of the 3rd order). The polynomial parameters can be determined by means of a HBM PC program AED_LIC.

The current measured value is retrieved by the command MSV?. The format of the measured value (ASCII or binary) is set by the command COF. An automatic measured value output can also be selected via the command COF.

Two types of digital filters, which are switched over using the command FMD, are implemented in the AED. At FMD0 filters lower than 1 Hz bandwidth are also available. In the filter mode FMD1, filters with fast transient recovery are activated with high damping in the stop band. You will find detailed information in the chapter ‘Individual descriptions of the commands’.

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The AD104 comprises two trigger functions in order to support functions in packaging machines and checkweigher:

• triggering by means of an adjustable level (gross and net measured value, for both types)

• external triggering by means of a trigger input

This special measuring mode is activated by means of the command TRC. The measured value determined is output by means of the command MAV?. For this measuring mode, filter mode FMD1 should be set (fast settling time).

The measuring speed depends on the preset stop time and the measuring period. The stop time should match the fast transient recovery of the filter used (ASF).

Triggering

Weig ht

Trigger level TRC- comm. Parameter 3 if P2=0

(TRC-Command: Parameter 1=1)

Tr an s. Re cov. time TRC- command Parameter 4

Measuring time TRC- command Parameter 5

Result in output memory

Time

Level triggering:

This measuring mode is suitable for weighing processes where the scale is relieved in between weighing events.

The scale is in a no load condition. The material to be weighed will be placed on the scale, the trigger level is exceeded, and stop time measurement starts. On expiry of this transient period, the actual weight will be determined; and on expiry of this measuring period, the actual weight value will be stored in memory. The weighing process can be restarted only once the weight value is again lower than the trigger level (place scale in no load condition). In this measurement mode, weight determination does not need to be monitored by an external computer at high speed. The output memory will contain an invalid value until a new measured 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 and measurement period x 10ms at ICR0) and the trigger level can be freely set by means of the command TRC. The trigger level will be on the user characteristic (NOV).

External trigger:

Both types support an external trigger instead of the limit value trigger. This trigger has a quiescent signal level at 0V (=low) and uses the low/high edge to activate the measurement process.

The trigger flank starts the stop time measurement. On expiry of this transient period, the actual weight will be determined over the measurement period, and the averaged actual weight value will be stored in memory. The output memory will contain an invalid value until a new measured 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. The periods (stop time and measurement period x 10ms at ICR0) and the trigger level can be freely set by means of the command TRC. A renewed trigger flank will restart the measurement process. The scale does not need to be placed into a no load condition.

During a measuring (waiting time + measuring time) a trigger signal is unvalid (no re-triggering). Within this mode the parameter trigger level (P3) has no function.

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5 Electrical connection

(yellow)

Fig. 5: Connection schema of the PCB and shielding concept of a measuring chain

The connection to the PC is effected by means of a 6 / 8 pin Pancon connector. The following pin wirings result at the connector according to the set interface (i.e. measuring chains of HBM):

AD104 type AD104-R5 AD104-R2

Pancon Connector Signals RS-485 Signals RS-232

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 measuring chain of HBM with AD104-R2 has a 6 wire shield

Explanation: UB Supply voltage (+ 5.6V...15V)

GND Ground

RA 4-wire connection AED receiver, line A (=RX-)

RB 4-wire connection AED receiver, line B (=RX+)

TA 4-wire connection AED transmitter, line A (=TX-)

TB 4-wire connection AED transmitter, line B (=TX+)

RxD Receiver data (UART, RS-232)

TxD Transmit data (UART, RS-232) TRG External trigger signal

ed cable.

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Trigger input (electrical data):

High: 3.2V ... 5V Low: 0V ... 0.8V Input current: <2.5 mA

Important notes on EMC protection:

The PCB AD104 alone has no EMC protection. The EMC protection can be achieved in addition with a shielded

housing for the electronic and the use of shielded cable.

Mount the load cell onto a metallic carrier which is connected to the ground connection of the device, or shield

AD104 with the load cell and load introduction parts as a complete unit. The cable shield needs to be connected

with the measuring body of the loadcell and the housing of the AED.

The housing of the AED or the load cell has to be connected via the solder pad to the PCB (see Fig. 5,

‘connection to housing’). The AED unit itself is provided with a protective filter for all interfaces and supply lines.

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).

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5.1 Transducer Connection

1-Ub 2-GND 3 4 5 6

Fig. 5.1: Transducer connection with the PCB (n.c. - not connected)

AD104

n.c. U IN4 IN1 U n.c.

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

UBr2 bridge excitation 2

IN4 amplifier input 4

IN1 amplifier input 1

UBr3 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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The connection is made through a six-core cable. The maximum cable length is 15 m. No bus mode is possible in this type of communications (no bus driver).

6 -Ub 5 -GND 12-TRG 10-RxD 8 - n.c. 9 -TxD 7 - n.c.

Fig.5.2: Connections on the PCB (AD104-R2)

The connection scheme for the asynchronous interface results as follows:

AD104-R2 Master

Receiving line RxD TxD transmission line

Transmission line TxD RxD receiver line

AD104 – R2

Operating voltage U

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 trigger signal:

Quiscent-signal level: TRG= 0V (Low)

Active measuring: TRG= Low-High edge (0V...5V)

If the external trigger is not used, the input remains open.

5.3 Serial Interface RS485 (Bus mode with AD104-R5)

Up to 32 AEDs can be connected to a common bus line through the RS-485 interface. The baud rate can be selected between 1200 and 38400 baud in this version.

The following specification applies for the transmission of one character:

Start bit: 1

Number of data bits: 8

Parity bit: none / even

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Stop bit:^ 1

6 -Ub 5 -GND 12-TRG 10-TA 8 -RA 9 -TB 7 -RB

Fig. 5.3.1: AD104-R5 for 4-wire bus mode (PCB connections)

1. Long lcable lengths (up to 500m) can be achieved with the aid of the RS485 bus drivers.

2. The bus mode of the AED is designed as master-slave configuration, whereby the AED implements a slave. Thus all activities of the AED are initiated by the control computer. Each AED receives its own communication address (00 ... 31) and can be activated through a select command Sii (ii= 00...31). A broadcast command (S98) is implemented for certain cases of communication. This means that after such a command, all AED execute the command of the master, but no AED answers. All commands of this communication as well as corresponding examples are described in Chapter 7.

Figure 5.3.2 shows the connection of the bus to the RS232/RS485 Converter (HBM Ordering-No. 1-SC232/422A).

AD104 – R5

Figure 5.3.3 shows the RS485 bus connection.

The terminating resistors of 500 ohms drawn in Figure 5.3.3 for the electrical function of the bus system are important. These resistors protect the quiescent-signal levels for the receivers on the bus line. The master line may be terminated with these resistors in this case only at the line ends. The master and the AED with the address 31 should contain the terminating resistors for the local distribution of the bus connections shown in the Figure. The AED contains these resistors already. These can be activated by the command STR1 (these terminating resistors are switched off on factory delivery). These terminations may not be activated more than twice in one bus.

The HBM interface converter also includes these terminators.

External trigger signal:

Quiscent-signal level: TRG= 0V (Low)

Active measuring: TRG= Low-High edge (0V...5V)

If the external trigger is not used, the input remains open.

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)

Fig: 5.3.2: Wiring of an AD104-R5 with an interface converter RS232/RS485

Line

Master line

4 - wire

termination

+5V

500

Ω

500

Ω

+5V

500

Ω

500

Ω

TA RB RA

RxDTxD on/off

TB TA RB RA

TxD on/off

RxD

Computer=Master AED = Slave 00 Slave 31 . . .

TB TA RB RA

TxD on/off

RxD

Line termination

+5V

500

Ω

500

Ω

+5V

500

Ω

500

Ω

Fig: 5.3.3: Bus structure 4-wire bus (RS485)

The bus wiring is not to be allowed in star configuration. The leads of the slaves are not to be increased of 3m. The best solution here: choin the main leads directly to the slaves.

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 the master terminating resistors)

Since the RS-485 is a differential bus interface, the quiescent-signal levels are also stated as a differential voltage between the lines (and not related to ground). It must further be noted that this interface tolerates a maximum common-mode range of +/-7V. If it is necessary, equipotential bonding should be established between the bus subscribers through a separate line. The cable shield should not be used for this equipotential bonding. The shield of the master line is connected with the shield of the AED housing (not with the supply ground).

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6 Command set

The commands can be classified roughly into:

• Interface commands (ADR, BDR, Sxx, TEX, COF, CSM)

• Commands for adjusting and scaling (SZA, SFA, LDW, LWT, NOV, LIC)

• Commands for the measuring mode (MSV, ASF, ICR, TAR, TAS, TAV, FMD, STP)

• Special commands (ZSE, ZTR, TDD, RES, DPW, SPW, IDN, STR, TRC, MAV)

• Command for legal for trade applications (LFT, TCR, CRC)

6.1 Command format

General notes:

The commands can be input in uppercase or lowercase type.

Each command has to be terminated by a termination character. This can be optionally a line feed (LF) or a semicolon (;). If only a termination character is sent to the AED, then the input buffer of the AED is cleared.

The statements made in round brackets () in the commands are urgently necessary 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 are suppressed. Numbers can be entered either directly or in exponent format, e.g. +12000lf or + exponent must not be more than 10 characters in length.

Answers consist of ASCII characters and are terminated with CRLF. The binary character output is an exception (see command MSV).

Each command consists of the command initials, the parameter(s) and the termination character.

1,2e4lf. The exponent e can be one- or two-digit, but a number including sign and

Command initials Parameters End character

Input ABC X,Y LF or ;

Output ABC? X,Y LF or ;

Example: MSV?20

20 measured values are output after this command. All ASCII characters <=- 20 except for 11

(ctrl q) and 13H (ctrl s).

(blank) may stand between command initials, parameters and end character,

H: Hexadecimal.

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6.2 Answers to commands

Answers to inputs (exception COF64...COF79):

Answer End character

Correct input 0 (zero) CRLF

Faulty input ? CRLF

Exceptions: The commands RES, STP, S00 ... S99 deliver no answer.

The command BDR delivers the answer in the new baud rate.

An error flag is received through the command ESR.

Answers to output commands:

Correct command Parameter1, ... Parameter n, or measured values CRLF

Faulty command ? CRLF (error flag via command ESR )

6.3 Output types for the measured values

You can select two types of output and a data delimiter (command TEX).

Output type 1:

The measured values are output arranged beneath one another.

Measured value1 CRLF Measured value2 CRLF

. . . . . . . .

Measured value n CRLF

Output type 2:

The measured values are output arranged next to one another.

Measured value1 (data delimiter) Measured value2 (data delimiter) ... Measured 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; msv?; xxxxxxxx CR LF (x- ASCII) 10

COF9; msv?; xxxxxxxx,xx,xxx CR LF (x- ASCII) 17

There is always a CRLF or the data delimiter defined by the command TEX as end identification of the measured value output. However these characters must not be filtered out as end identification in the binary output, since these characters can also be contained in the binary code of the measured value. Therefore only counting the bytes helps in the binary output. The corresponding places after CR or LF or the data delimiter can then be enquired for subsequent syntax testing.

Password protection:

The password protection of the AED comprises important settings for the characteristic of the scale and its identification. Commands with password protection are activated only after the password is entered. These commands are answered with “?“ without entry of the password through the command SPW.

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6.4 Command overview

Command PW TDD 1 Function Page

ADR

ASF

BDR

COF

CRC

CSM

DPW

ENU

ESR

FMD

ICR

IDN

LDW

LFT

LIC

LWT

MAV

MSV

NOV

RES

S...

SFA

SPW

STP

STR

SZA

TAR

TAS

TAV

TDD1/2

TDD0

TEX

TCR

TRC

ZSE

ZTR

x Zero point, user characteristic 32

x Linearization 57

x Nominal value, user characteristic 33

x x Nominal value scaling 34

x Internal nominal value, factory characteristic 30

x Stop measured value output 29

x Factory setting 52

xAdress18

x Digital filter 40

x Baud rate 19

x Output format in MSV? 20

external checksum for legal for trade applic. 66

x checksum in MSV status 24

Define password 47

Dimensional unit 50

Status 62

x Filter mode 42

x Measuring rate 43

Identification of transducer type and serial number 51

x Legal for trade applications 64

Measured value, trigger function 58

Measured value output 36

Reset 49

Select of AED in bus operation 26

Password entry 48

Messwertausgabe stoppen 39

x Switch bus termination resistors on/off 63

Tare mode 44

x Gross/net switch-over 46

x Tare value 45

Store setting in EEPROM, read EEPROM 52

x Data delimiter for measured value output 25

Trade counter 65

x Trigger setting 59

x Initial zero setting 55

x Automatic zero tracking 56

TDD1 – stored with TDD1 command

PW – protected by password with commands DPW/SPW

The following commands result in no change to the AED setting:

ACL, ASS, CAL, COR, GRU (compatibility with other AED versions).

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7 Individual descriptions of the commands

7.1 Interface commands (asynchronous, serial)

Characteristic data of the interfaces

Start bit: 1

Word length: 8 bits

Parity: none / even

Stop bit: 1

Software handshake (XON / XOFF) is possible

Baud rate: 1200; 2400; 4800; 9600;19200; 38400 baud

The asynchronous interface of the AED is a serial interface, i.e. the data are transmitted bit for bit after one another and asynchronously. Asynchronous means that the transmission works without a clock signal.

A start bit is set before each data byte. The bits of the word, a parity bit for the transmission protocol (optional) and a stop bit then follow.

1 Bit Word length = 8 data bits 1 Bit 1 Bit

Start Parity Stop

1 character

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.

The exact baud rate of the receiver is synchronized with the start bit for each transmitted character. The data bits which all have the same length then follow. After the stop bit is reached, the receiver goes into a ‘waiting position’ until it is reactivated by the next start bit.

The number of characters per measured value depends upon the selected output format (COF command) and can be 2 to 17 characters (see also COF command).

The interface must be configured to build up the communication between AED and computer. The following commands are provided in the AED for this : ADR; BDR; COF; TEX; S..;

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Address

ADR

Range: 0...31 Factory setting: 31 Response time: <15ms Parameters: 2 Password protection: none Parameter protect.: with command TDD1

Input: ADR(new address),<"Serial No.">;

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 addresses in the case of several AEDs with the same address (initialization of the bus mode).

The serial number must be stated in “ “ as in the command IDN.

(device address)

Entry of the device address as decimal number 0...31.

Example: ADR25,"007" CRLF

Query: ADR?; 25CRLF (Example)

Effect: Output of the device address as decimal number 0...31

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Baud Rate

BDR

Baud rates: 1200, 2400, 4800, 9600, 19200, 38400 Baud Factory setting: 9600 Baud and even parity Response time: <15ms Parameters: 1 Password protection: none Parameter protect.: with command TDD1

Input: BDR <Baudrate>,<Parity>

Entry of the required baud rate as decimal number.

Possible baud rates are:

1200, 2400, 4800, 9600, 19200, 38400 Baud

Input or the requested parity:

0= without parity bit 1= with even parity bit

(Baud rate)

Important Note

The answer 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 that the baud rate remains changed permanently, it must be stored in the EEPROM with the command TDD1. This procedure serves also as safeguard that no baud rates can be set in the AED which the remote station does not support. If the newly entered baud rate is not stored, the AED reports after a reset or power On again in the previously valid baud rate.

Query: BDR?;

Effect: Output of the set baud rate, Identification for parity bit

Example: BDR?; 9600,1 CRLF corresponds to 9600 baud, even parity

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Configurate Output Format

COF

Range: 0...255 Factory setting: 9 Response time: <15ms Parameters: 1 Password protection: none Parameter protect.: with command TDD1

Input: COF(0...255);

Input of the output format for measured value command MSV

The possible formats and the decimal number to be entered for 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 binary NOV value 5120000

ASCII NOV value 1000000

(Ausgabeformat für die Messwertausgabe)

For the 2-bytes binary output, the NOV value must be < 30000, otherwise the measured value is output with overflow or underflow (7fff H or 8000H). With NOV30000, the overload range is only still approx. 2700 digits.

Query: COF?;

Effect: Output of the selected output format as three-digit decimal number from 0...255

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COF formats:

The following combinations result on entry of COF0 to COF12:

• MSB = most significant byte

• LSB = least significant byte

In binary output, the sequence of the bytes MSB Æ LSB or LSB Æ MSB can be selected. In ASCII output, the device address and/or measured value status information can be output in addition to the measured value.

Binary format:

Parameter Length Sequence of the measured value output

COF0

COF2

COF4

COF6

COF8

COF12

Measured value 4 Byte MSB before LSB LSB=0 (no Status)

Measured value 2 Byte MSB/LSB

Measured value 4 Byte LSB before MSB LSB=0 (no Status)

Measured value 2 Byte LSB/MSB

Measured value 4 Byte MSB before LSB LSB=Status/CRC

Measured value 4 Byte LSB before MSB LSB=Status/CRC

ASCII format:

In ASCII output, a freely selectable data delimiter is set between the parameters (see command TEX). crlf or the selected data delimiter follows after the last parameter.

T = Data delimiter () = Number of characters

1st Parameter T 2nd Parameter T 3rd Parameter End character

COF1

COF3

COF5

COF7

COF9

COF11

Important Note

In bus mode, the output format must not be set to COF9.

Meas. value (8) T(1) Adress (2) — CRLF or T

Meas. value (8) — — CRLF or T

identical with COF1

identical with COF3

Meas. value (8) T(1) Adress (2) T(1) Status(3) CRLF or T

Meas. value (8) T(1) — — Status(3) CRLF or T

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Bus mode: COF16 to COF 28

If the decimal number 16 is added to the above stated output formats COF0...COF12, then the AED is switched into the bus output mode. A measured value is output. The AED switches over to the partially active mode (each new measured value is stored in the output buffer but not output). The measured value is output on the bus with the select command S..;.

Example: 2 AED’s in bus operation

Command Effect

S98;

COF18;

ICR0;

MSV?0;

S01;

S02;

All AED are partially active (listening but not transmission)

Output in 2 byte binary output

Maximum measuring rate

Continuous measurement in AED

Read measured value from 1st AED, immediate output of current measured value, without

measuring time

Read measured value from 2nd AED, when response from first AED has been received completely. Immediate output of current measured value, without measuring time

S01;

S02;

... ...

STP;

S01;

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 following output mode for the measured values.

In the binary measured value output, the end character CR LF is left out, so that only 2 or 4 characters per measured value are output. This measure increases the output speed of the measured values.

Format Length Sequence of the measured value output

COF32

COF34

COF36

COF38

COF40

COF44

Read measured value from 1st AED, when response from second AED has been received completely

Stop measured value output

Poss. new setting for 1st AED

4 Byte MSB before LSB LSB=0 (no status)

2 Byte MSB before LSB

4 Byte LSB before MSB LSB=0 (no status)

2 Byte LSB before MSB

4 Byte MSB before LSB LSB=status/CRC

4 Byte LSB before MSB LSB=status/CRC

2-wire bus mode: COF64 ... COF76 (do not use for variants AD104-R2 and AD104-R5)

If the decimal number 64 is added to the above stated output formats COF0...COF12, then the AED is switched into the 2-wire bus mode. This means that the AED answers no longer with “0“ or “?“ on command inputs. The answer with the parameter or in the case of MSV? with the measured value occurs only for command enquiries (e.g. ASF?). The command MSV?0; (continuous measured value transmission) may no longer be used in this case since otherwise it is no longer possible to stop this output (apart from supply voltage off).

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HBM AD104-R2, AD104-R5 Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual