Operating instructions
Bidirectional
Data Interface
AM-/PM-/SM Balances
and Scales
METTLER TOLEDO
DataPac-M
0.0
g
0.0
g
152.0
9
Leer
Contents Bidirectional Data Interface of the AM/PM/SM Balances and Scales – DataPac-M
1. Overview
1.1 What are the interface capabilities? 2
1.2 Dialog computer/weigh. station with the aid of DataPac-M 3
2. Preparation
2.1 Connector sockets of the balances 4
2.2 Matching the interface to the unit to be attached 6
2.3 Attaching units with current loop interface 7
2.4 Attaching units with RS232C interface 8
3. Interface
3.1 How does the interface function? 9
3.2 Hardware handshake RS232C 10
3.3 General information regarding CL interface 11
3.4 General information regarding RS232C interface 12
4. Data output
4.1 Initiating the data output 13
4.2 Data output using auxiliary switch 14
4.3 Data format 15
5. Commands to control the balance
5.1 General information regarding command setMnemonic 17
5.2 Send stable weighing result S 18
5.3 Send current weighing result SI 18
5.4 Send a dynamic and a stable weighing result
continuously SR 19
5.5 Send stable weighing results continuously SNR 20
5.6 Send all weighing results continuously SIR 20
5.7 Taring T 21
Mnemonic
5.8 Immediate taring TI 21
5.9 Subtracting a fixed value (tare preset) B 22
5.10Change weight unit U 22
Definition of a weight unit with self-selected divisor U 23
5.11Setting the vibration adapter
5.12Setting the weighing process adapter
5.13Setting the stability detection AsdMS 25
5.14Off/on switching of Auto Zero AZ MZ 26
5.15Off/on switching of weighing-in aid dd MA 26
5.16Resetting to default setting M 27
5.17Send identification ID 27
5.18Calibrate CA 28
5.19Display text D 28
5.20Entering limits for checkweighing/dispensing weigh. DY 30
5.21Controlling DeltaTrac DX 31
5.22Controlling peripherals from the balance W 32
6. DataPac-M
6.1 DataPac-M terminal 33
6.2 Defining the dialog computer – DataPac-M D 34
7. Programs to get started
7.1 Communication with the balance 38
7.2 Evaluation of the weighing data 38
7.3 Use of commands to control the balance 39
8. Malfunctions
8.1 What happens if …? 40
_MI 24
;ML 24
1
A
A
1. Overview
DATA
200 - 240 V : T 63 m
I/O
100 - 120 V : T 125 m
GM
Rear of balance with interface sockets
2
1.1 What are the interface capabilities?
The interface allows the balance to communicate with other devices, e.g. computers or
terminals. In addition, remote operation of the balance is possible. Virtually all commands which
can be entered using the Menu key can also be entered via the interface. Control is not only via
the balance display but also through acknowledgements at the interface.
The METTLER TOLEDO AM/PM/SM balances are fitted with a bidirectional data interface
(DATA I/O) and an interface for peripherals (GM) as standard. They can transmit weighing
results to a peripheral device at the DATA I/O socket via 20 mA current loop or RS232C, and
at the same time also receive commands to control the balance (full duplex operation). It is thus
possible to integrate AM/PM/SM balances in a controlled weighing system.
The interface can also be used for:
– automatic transfer of weighing results – selecting the balance operating mode (mat-
– taring and presetting of tare ching to weighing sample, surroundings, etc.)
– changing the weight unit – controlling the display (dialog text, DeltaTrac)
– calibration – controlling peripherals
– entering limits for checkweighings – identifying the balance
and dispensing weighings – defining the dialog with DataPac-M terminal
Software version
The present operating instructions describe the interface inserted software STANDARD
V10.50.00. This number can be checked on the inserted software cassette or on the balance/
scale display after switching on the balance or scale.
Applications, Technical Data, Accessories METTLER TOLEDO AM/PM/SM Balances and
Scales
This is the name of the brochure that is enclosed with every AM/PM/SM balance or scale. Here
you will find a complete overview of all peripherals and connection cables.
Weighing station terminal
1.2 Dialog between computer and weighing station with the aid of DataPac-M
The DataPac-M includes a keypad that operates together with the display of the balance as a
weighing station terminal. This makes communication between a computer and the weighing
station possible.
Thus, for example, weighing instructions to the operator can be transmitted from the computer.
Or the operator can call up certain weighing programs from the computer, select partial programs
with yes/no, or enter article and lot numbers.
Hardware of the DataPac-M
The DataPac-M comprises a keypad attachable to the GM socket of the balance as input device
and the DataPac software, which is already included in the standard software of the AM/PM/SM
balances. For dialog text the display of the balance is used. The computer is attached to the I/
O interface of the balance.
The DataPac-M can be used after software version STANDARD V10.20.
DATA
I/O
GM
Connection DataPac-M
200 - 240 V : T 63 mA
100 - 120 V : T 125 mA
User software of the computer
The form of the dialog between a computer and the weighing station is defined using the
computer. The operator response can be limited to a few alternatives, e.g. yes/no. This allows
the programming effort to be considerably reduced.
DataPac-M description
Since the interface of the balance is used for the dialog, the present interface description also
describes the operation of the DataPac-M (section 6).
3
2. Preparation
A
A
DATA
I/O
GM
200 - 240 V : T 63 m
100 - 120 V : T 125 m
4
2.1 Connector sockets of the balances/scales
2.1.1 AM and PM balances
The balances have the following connector sockets:
DATA I/O: Devices with RS232C or CL interface, e.g. a computer (bidirectional operation),
printer, GA50 Peripheral Controller, adapter cable for data output using hand or
foot switch (unidirectional operation)
Rear of AM/PM balances
DATA I/O GM
Rear of high-capacity PM scales
GM: DataPac-M keypad, GM instruments with adapter plug, e.g. GM303 Control Unit,
secondary display, LV10 Automatic Feeder, adapter cable for taring using hand
or foot switch.
The coding pins at the sockets prevent improper insertion.
Rear of SM scales
SM terminal connector or
system connector
at base of scale
2.1.2 SM scales
In addition to the DATA I/O and GM sockets mentioned, the SM scales have a third socket on
the underside of the weighing platform for the detachable SM terminal (scale display with keys).
Connection socket for the SM terminal
Different terminals
The SM scales can be operated with different terminals or, if in integrated in a network, also
without terminal. As a rule, a base terminal is attached to the scale that has either a fluorescent
display (VFD) or a liquid crystal display (LCD) (terminal model SM-F or SM-L). For special cases,
so-called application terminals with integrated DataPac-M keypad are available (terminal model
SM-AF with VFD or SM-AL with LCD).
Computer-controlled multistation weighing system with SM scales without terminal
If one or more weighing platforms of the SM scales are attached directly, i.e. without terminal,
with the aid of the serial interface to a computer, each weighing platform must be fitted with an
34490 system connector.
The SM scales do not recognize any standby operation and could not be switched on even via
the interface after a power outage. The system connector allows standby operation and is
inserted in the same place where the absent terminal would be attached. It keeps the weighing
platform permanently switched on.
5
6
2.2 Matching the interface to the unit to be attached (configuration)
The configuration is described in detail in the operating instructions and
is thus repeated here only in brief.
To select the interface parameters, first the configuration register
has to be entered as follows:
– Switch of balance/scale ➝ standby no display.
– press control bar and
keep pressed until appears,
then release bar so that appears.
When in the configuration register, briefly pressing the control bar
allows switching from the sector “rESET” to the sectors “SCALE”,
“Unit” or “I-FACE”.
In an individual sector, the desired parameter is selected by pressing
and holding the control bar and then its value is determined by pressing
the control bar briefly (default value = black).
2.2.1 Sector "I-FACE"
Data transmission mode (see section 4):
S. Stb
S. ALL
S.Auto
S.Cont
stable single values
current single values (stable or not)
stable single value after each weight change
all values, continuous
Transmission rate (baud rate):
b 110
b 2400
b 9600
110 baud
2400 baud
9600 baud
------
-ConF-
rESEt
Parity:
P E
P -0-
P -S-
P -N-
Even
Odd
Space (use for 8-bit code)
Mark (use for “no parity”)
Pause between data lines and handshake:
PAUSE .0
PAUSE H
PAUSE 1
PAUSE 2
for rapid peripherals (computer etc.)
utilize handshake line
for slow peripherals (printer etc.),
1.0 or 2.0 sec. pause between the data lines
Auxiliary (suppression of auxiliary symbols)
Au oFF
Au on
Result with certification symbol <…> or * in animal wgh.
Suppression of these auxiliary symbols
2.2.2 Sector "Unit" Start data output
With the AM/PM balances, which have only a control bar, this can also
be used as an alternative method of initiating the data output.
Art oFF
Art on
Control bar normal
Control bar + print/data output/start function
2.2.3 Sector "rESEt" Resetting to default parameters (black):
o
YES
-End-
8.88 g
appears.
– Press key and
keep pressed until
2.3 Attaching units with current loop interface
You will find a complete list of all cables in the brochure “Applications, Technical Data,
DATA
I/O
GM
200 - 240 V : T 63 mA
100 - 120 V : T 125 mA
Accessories METTLER TOLEDO AM/PM/SM Balances and Scales”.
The METTLER TOLEDO GA44 Printer can be attached directly. The cable is enclosed with the
printer (for additional cables: Order number 47926).
The balance should be configured with the default values.
15
10
9
7
6
View of cable side
47936
15
10
9
7
6
33930 (Solder side)
+
4
5
1
2
cable must be ordered. The illustration shows the wiring.
+
A non-METTLER TOLEDO unit can be attached to the BB balance as shown in the illustration.
The non-METTLER TOLEDO unit must take over the power supply of the CL interface and here
it is essential that the limiting data described in section 3.3 are observed. The I/O balance
connector (“MiniMETTLER”) can be ordered as an accessory: 33930.
7
For the attachment of other METTLER TOLEDO units with CL interface (solder side) the 47936
8
2.4 Attaching units with RS232C interface
You will find a complete list of all cables in the brochure “Applications, Technical Data, Accessories METTLER TOLEDO AM/PM/SM Balances
and Scales”.
Prepared cables are available for the following units: Printer EPSON P-40 Order No. 33688
Computer EPSON PX-4 33982
HX-20 33955
33640
33783
33995
For other units with an RS232C interface, cables with freely attachable contacts can be
ordered. One end of the cable carries the permanently attached I/O balance connector, the other
end the connector with the freely attachable contacts.
Order No.
Cable set with 25-pin connector (male), e.g. for printer 33640
Cable set with 25-pin coupling (female), e.g. for IBM-PC, IBM-XT 33995
Cable set with 9-pin coupling (female), e.g. for IBM-AT, Toshiba T1000 33783
Depending on whether the unit to be attached is a data terminal unit (DTE see also 3.4) or a data
communications unit (DCE), the cable must be wired as follows:
11
6
1
Connector, view from cable end
1
14
13
25
1
69
5
Balance Description of the function DTE DCE DTE DCE
2,green data (commands) for balance 2 3 32
12,brown data from balance 3 2 2 3
13,white signal ground 7 7 5 5
3,yellow handshake for balance 4/20 5/6 4/7 6/8
short-circuiting link 20/4 6/5 7/4 8/6
(optional) 5 4 8 7
6206 4
81
3. Interface
3.1 How does the interface function?
Serial data transmission
TTTT
High
Low
Start Bit Bit 1 Bit 2 Bit 7 Parity Stop Bit
The data are transmitted serially, i.e. character by character one
character after the other. Each character is represented by a 7-bit
binary code. The individual bits of the character are also transmitted
serially. A wire pair thus suffices for the data transmission in one
direction.
In the idle state (no data transmission), the relevant data line is active
(20 mA quiescent current with current loop, potential “high” with
RS232C).
The transmission of a 7-bit character is initiated with a start bit
(transition from 20 to 0 mA or “high” to “low”) followed by the 7 data bits.
The order of the data bits starts with the least significant bit (LSB) and
ends with the most significant bit (MSB).
A subsequent parity bit allows the correctness of the data transmission
to be checked. It is added to the number of “1’s” of the data bits of a
character to make an even or odd number (even or odd parity).
The 10th bit (stop bit) is again “high” and shows the end of the
transmission for this character. A chain of characters transmitted
successively is called a data string.
The AM/PM/SM interface
The balance has an RS232C voltage-controlled data interface and a
passive 20 mA current loop interface (CL), both led out to the
DATA I/O socket.
These interfaces can be used both unidirectionally and in bidirectional
full duplex operation.
The data outputs of both interfaces operate in parallel. Both outputs can
be used at the same time, but only one input either CL or RS232C.
The data inputs are ready to receive as soon as the display has been
switched on. The data outputs remain blocked until the start routine is
complete.
Transmission principle: serial by bit, asynchronous (1 start bit), 7-bit
code ASCII ISO646 + parity bit, 1 stop bit
(receive), 2 stop bits (send)
In bidirectional operation, switching off the other device or a break in the
interface cable (BREAK) resets the balance/scale to the configured
status. In other words, all functions that have been triggered by
commands via the interface (transmission mode, tare preset, text
display, etc.) are reset.
Configuration of the interface parameters is described in section 2.2.
9
10
3.2 Hardware handshake RS232C
Operating modes: – Free Mode
– Handshake Mode
Software handshake according to “Technical Information Bulletin” TIB: “The
METTLER TOLEDO CL Interface”. Order
No. in section 3.3 “General information
regarding METTLER TOLEDO CL
interface”.
These operating modes can also be used for the RS232C interface.
Matching of data supply and demand between balance and unit to
be attached
Data losses can selectively be prevented as follows without the need
for handshake lines:
1. With the handshake mode (software handshake)
2. With an adjustable pause time between the data strings of up to
2 seconds.
3. By selective request of the weighing result with the command
CRL
SI
F . If the balance can not provide a valid result, it sends “SI”
immediately. The controlling computer is thus informed at all times
that it must once again request a measured value.
The hardware handshake described in what follows also offers a
possibility to control the data flow.
With the aid of a separate signal line (DATA I/O socket pin 3, connection
cable yellow litz wire), the transmission of data via the RS232C
interface of the AM/PM/SM balances can be “curbed”, i.e. the balance
sends data only if the attached device reports operational readiness.
The attached device must have handshake functions and be wired in
accordance with section 2.4.
The signal is evaluated when “PAUSE H” has been set in the configuration and when the line is actually wired up.
If a positive voltage is applied to the handshake line or if it is open, the
balance sends. In the case of a negative voltage it does not send. If the
level changes from positive to negative during a transmission, maximum 2 additional characters are transmitted.
If this handshake function is used, the data output may not be
triggered with an auxiliary switch as described in section 4.2.
3.3 General information regarding CL interface
W
The CL interface of the balance is primarily suitable for transmissions
over relatively long distances (> 15 m) or for operation of the balance
in the case of severe power line disturbances. It is completely separated
galvanically from the balance by an optocoupler and thus prevents the
intrusion of disturbances in the electronics.
The CL interface has two passive transmission loops independent of
each other.
passive active
passiv aktiv
PeripheralBalance
The passive current loops of the balance must thus be supplied by
external current sources. To avoid damage to the CL interface by these
external current sources, it is essential to observe the following limiting
data:
I
(mA )
I max 30 mA
The U/I characteristic
P max 800 m
of the source must lie
within the hatched
area.
U max 40V
U
( V )
40
The interfaces of the METTLER TOLEDO units require the following
specifications:
– voltage excursion of source 15 V (+10%/–0%)
– current (high) between 18 mA and 24 mA
– rate of change 2...20mA/µs
– cable: shielded, twisted pairs,
0,14 mm2, 125 ohm + 130nF/km
max. length: 1000 m/300 baud, 500 m/2400 baud
For further information see also “The METTLER TOLEDO CL Interface”,
720106 (German), 720107 (English), 720108 (French),
720109 (Spanish).
11
E
3.4 General information regarding RS232C interface
12
Voltage-controlled interface in accordance with the standards EIA
RS232C, DIN 66020. These standards conform to the CCITT recommendations V.24 and V.28.
A distinction is made between two types of equipment:
– Data Terminal Equipment (DTE), e.g. teleprinter, printer, IBM-PC
– Data Communications Equipment (DCE), e.g. modem, transmitter
RS232C RS232C
DTE DCE DCE DTE
The RS232C interface was originally conceived to link such data
terminal equipment with data communications equipment. The lines
and signals have been designed for this original configuration, which is
still in use today.
DTE
1
2
3
E
4
5
6
7
8
23
24
25
E
DCE
Modem
S
Example:
S
Computer
– A DTE unit sends its data via connection 2
(data direction DTE ➝ DCE).
– A DCE unit sends its data via connection 3
(data direction DCE ➝ DTE)
For short distances (< 15 m) where data highways are not practical, the
RS232C interface is also used for any two units, i.e. the combinations
DTE – DTE and DCE – DCE are entirely possible. Certain signals and
lines can be omitted in such cases. A minimum configuration can be
implemented with two (unidirectional operation) or three lines (bidirectional operation).
2
3
7
DTE DCE
2
3
7
DTE DTE
2
3
7
2
3
7
2
3
7
DCE DCE
2
3
7
In addition to the above-mentioned interface lines the most common
handshake lines are shown below:
1 Protective Ground 1
2 Transmit Data TxD 2
3 Receive Data RxD 3
4 Request to Send RTS 4
5 Clear to Send CTS 5
DT
6 Data Set Ready DSR 6
7 Signal Ground GND 7
8 Data Carrier Detect DCD 8
20 Data Terminal Ready DTR 20
The definition of the above terms is from the angle of the DTE.
DCE
4. Data output
4.1 Initiating the data output
The balance has always a current weighing result available that can
either be stable or unstable, valid or invalid. All four combinations are
possible.
Depending on the application, the data output can be initiated in the
following ways:
– Print key or control bar of the balance
– external print key (auxiliary switch or “PRT” key on GA44)
– automatic operation (configuration: “S.Auto”, “S.Cont”)
– commands via the interface (send commands)
– loading or unloading the balance (send commands “SR”, “SNR”)
The default setting for the data transmission mode is:
S. Stb A stable single value is transmitted if the data transmis-
sion has been triggered by a key.
The transmission mode can be modified in the configuration register
(I-Face), (see also section 2).
S. All A current single value (stable or unstable) is transmitted
if the data transmission has been triggered by a key.
S. Auto A stable value is automatically transmitted after every
load change. (Magnitude of change, see Table under
SNR command, section 5.5.)
S. Cont All values are transmitted automatically in step with the
configured pause – with “Pause 0” in step with the
display update speed, see also SIR command, section 5.6 – or with handshake.
Nonstable weighing results are marked in the identification block with “SD” and stable ones with “S/” (see
section 4.2, Data format).
In bidirectional operation these transmission modes can be selected
via the interface with send commands (see section 5), irrespective of
the configured transmission mode.
Transmission mode corresponding send command
S. Stb * S
S. All * SI
S. Auto SNR
S. Cont SIR
* initiate transmission with key
In the case of an interface break, the transmission mode is lost if it has
been selected via the interface. On the other hand, the configured
transmission mode remains stored until a new one is configured.
Note: The default setting for the pause between the data
strings is 1 second (for GA44 Printer). In the case of
operation with a computer this pause is too long. Therefore, in most cases, it has to be configured at (0).
13
4.2 Data output using auxiliary switch
14
42500
GM303
The data output can be initiated by a hand or foot switch.
If a hand switch is needed directly at the balance for the AM/PM
balances, the GM303 Control Unit can be installed.
If the switch has to be positioned somewhat apart from the balance, a
separate hand or foot switch can be used.
An adapter cable is also needed for the attachment of this switch. This
extends the I/O interface socket of the balance to the rear and carries
a 2-pin socket on a Tee joint for attachment of a hand or foot switch.
Adapter cable Order No. 47473
Hand switch 42500
Foot switch 46278
If the data output is triggered using the auxiliary switch (or by means
of the PRT key at the GA44 Printer), the handshake function
described in 3.2 is not possible.
46278
47473
4.3 Data format
Format of weighing result
Each valid weighing result is available at the data output in a standard
format. The data string can be divided into three blocks. It is always
terminated with Carriage Return (
/ = (Space)
01 02 03 04 05 06 07 08 09 10 11 12 13 14....
/
Identification block Data block Unit block
C
R) and Line Feed (LF).
/
L
C
R
Char. Information Code Explanation
04…12 Weighing result x 9 characters, result right-aligned
including sign “–” directly in front of
the first numeral, decimal point;
leading zeros are replaced by spaces.
F
Outside the DeltaRange or if unstable results, the last digit is shown as
a /. Drops therefore the decimal
point, it will be replaced by /.
Char. Information Code Explanation
01 Type of data triggered from the balance
/
initiation with auxiliary switch or print key,
or animal weighing, triggered in
any way
S triggered via the interface with
Send commands or balance in the
“Send Continuous” mode
(“S.Cont”)
02 Status messages stable result
/
D unstable result (dynamic)
* animal weighing
1)
14... Weighing unit x 0…4 characters, terminated imme-
CR L
diately with
F: g or one of 10 other
units, depending on requirements.
Example:
CR L
SD////-24.37/g
1)
* can be replaced by /, if “Au on” is
configured in sector I-FACE.
15
F
16
Messages on invalid weight result
In special operating modes (e.g. during overload, underload, error
message etc.) the balance can not provide a valid weight result. It thus
sends only a status message. This also indicates whether the data
output has been initiated by means of a key or command or configuration.
Status messages on initiation by means of a key (“Print”, “PRT”,
auxiliary switch) and configuration “S. All”or “S. Cont.” :
/I
/I +
/I -
CR L
F invalid result
CR L
F overload
CR L
F underload
2)
Status messages on initiation of the data output by means of com-
mands or through the transmission mode “S.Cont”:
CR L
F invalid result
SI
CR L
SI +
SI -
F overload
CR L
F underload
2)
If the balance transmits neither a result nor a status message after
initiation of the data output, this means that it is waiting for a stable
weight value.
2)
e.g. data transfer during taring process which could not be completed
because of instability
General status messages
CR L
F Message in bidirectional operation of the ba-
TA
lance: The automatic taring process after
switching on the balance is complete or taring
has been performed with a key.
CB/< Text >
STANDARD ///V10.50.00
CR L
F Response on calibration
CR L
F
Start message, software version
Error messages → section 8
Examples of printouts
Configuration “S. Cont” Configuration “S. All”
********************
Standard V10.50.ØØ
S -Ø.Ø2 g
SI
TA
S Ø.ØØ g
SD 8.2 g
SD 2ØØ.4 g
SI+
S 195.47 g
S 195.46 g
********************
Standard V10.50.ØØ
-Ø.Ø5 g
I
Ø.ØØ g
D 17.8 g
19.25 g
19.24 g
19.24 g
5. Commands to control the balance
5.1 General information regarding command set
AM/PM/SM balances with full duplex interfaces can not only send
weighing results but also receive control commands at the same time.
These commands are described in what follows.
Entry of cammands
After software version STANDARD V10.42, uppercase or lowercase
letters can be used for commands.
Each command must be terminated with the character sequence
CARRIAGE RETURN (
Per command, maximum 64 text characters are possible incl.
A command without associated parameters generally resets the appro-
priate function.
Note: Simple examples for application programs can be found
in section 7.
The following symbols are used in this section:
/ space
: = definition
parameter
[ ] optional
C
R) und LINE FEED (LF).
parameter
CR L
F.
Interface commands and applications
Commands that intervene in an application, abort this application.
For example, the U command terminates the unit switching by means
of the control bar. The D, DY and B commands terminate piece
counting (Stk, PCS) and percent calculation (%).
Switching on the balance
In bidirectional operation of the interface the handshake is set up on
startup before the switch-on zero has been determined. It is thus
essential that the computer waits for the message “TA” from the
balance before it sends commands. Otherwise, it must be anticipated
that, e.g. SR and B commands are overwritten during this operation.
Communication failures
Commands that could not yet be executed are overwritten by newly
received ones, i.e. they are lost.
A BREAK condition (see section 3) clears all commands and the
balance again behaves as if it had been switched off and then on.
If the balance has not received a command properly or can not evaluate
or execute it, it sends an appropriate error message (see section 4.3).
17
18
5.2 Cmd: S (Send value)
Format: S
Function: The balance sends the next possible stable
Notes: On stability, the current result is sent immediately.
Example: Computer Balance
CR L
F
weighing result.
With “S
CRL
F” send commands previously transmitted
can be cancelled by overwriting.
CR L
S
F
stability
S////100.00/g
or on overload
CR L
SI+
or on underload
CR L
SI-
CR L
F
F
5.3 Cmd: SI (Send Immediate value)
Format: SI
Function: The balance sends the current weighing result.
Note: Unstable results are marked with the status message
Example: Computer Balance
F
CR L
F
“D” (dynamic); with valid results “SI” is transmitted.
(→ 4.3 Data format).
CR L
SI
F
SD////98.54/g
CR L
F
or on stability
S////100.00/g
CR L
F
or if invalid
CR L
SI
F
or on overload
CR L
SI+
F
or on underload
CR L
SI-
F
5.4 Cmd: SR (Send value and Repeat)
Format: SR [
//
/
threshold
//
]
CR L
F
Function: The balance sends the next possible stable result
and then on each load change of a certain magnitude
a dynamic and the subsequent stable result.
Parameter: The magnitude of the load change can be entered in
absolute terms as a
threshold
value, in the weight unit
selected under “Unit 1”, numerical value at least 3d*.) If
only “SR
CRL
F” is entered, the magnitude is 12.5% rela-
tive to the last stable value or at least 30d*.
Notes: The entry of a threshold value is advisable primarily in
automatic additive weighing operation. Here, an absolute response threshold is necessary since with “SR
CR L
the threshold fixed as a relative value would increase
with increasing total weight.
This automatic transmission mode remains in force until
the balance receives some other send command or the
interface experiences a break.
* d = digit = smallest display increment
Example: Computer Balance
CR L
SR
F
stability
S////100.00/ g
deflection
SD///115.78/ g
stability
F”
S////150.00/ g
etc.
Certified The SR command leads to the error message “EL”.
balances: However, it is usable after configuration “Au on”.
threshold
If
is not added, the load change is 25% or 30 d.
CR L
CR L
CR L
F
F
F
19
20
5.5 Cmd: SNR (Send Next value and Repeat)
Format: SNR
Function: The balance sends the next stable result and then
Notes: Readability balance (g) 0,0001 0,001 0,01 0,1 1
Example: Computer Balance
Certified This command leads to the error message “EL”.
balances: However, it is usable after configuration “Au on”.
CR L
F
after every load change automatically a further
stable result.
Load change (g) ≥ 0,2 1 1 1 5
In contrast to the SR command no dynamic values are
transferred.
This automatic transmission mode remains in force until
the balance receives any other type of send command
or the interface experiences a break.
CR L
SNR
F
F
stability
S////100.00/ g
CR L
F
deflection min. 1 g
stability
S////150.00/ g
CR L
F
etc.
5.6 Cmd: SIR (Send Immediate value and Repeat)
Format: SIR
Function: The balance sends in every case the current result
Notes: Particularly suitable for dynamic weight determination.
Example: Computer Balance
CR L
F
and then automatically all further results, at a maximum rate in step with the balance display (i.e.
approx. every 130 ms; SW < 10.50 every 160 ms).
Owing to the large data volume of the balance the baud
rate must be correspondingly high if no value is to be
lost.
If a printing interval of 0.0 has not been configured, the
transmit clock corresponds to the pause time (1 or
2 seconds). Intermediate values are lost.
This automatic transmission mode remains in force until
the balance receives any other type of send command
or the interface experiences a break.
CR L
SIR
F
SD////98.54/ g
SD////95.76/ g
SD////95.32/ g
S/////95.40/ g
CR L
CR L
CR L
CR L
F
F
F
F
etc.
5.7 Cmd: T (Tare)
5.8 Cmd: TI (Tare Immediately)
Format: T
CR L
F
Function: With this command, taring can be performed via the
interface and the balance switched on again after a
power outage.
Notes: If an SI or an SIR command follows a T command while
the balance is still waiting for stability, it returns “SI”.
If no stable condition has been attained after approx.
10 s, the error message “EL” follows.
With the AM/PM balances, –OFF– appears in the display
after a power outage. The balance can be switched on
again with "T
CR L
F"
The time needed for taring can vary; no acknowledgement is sent when it is complete. In the case of
overload/underload, taring can not be performed. The
error message “EL” is sent immediately.
Example: Computer Balance
CR L
T
F Instability:
– – – – – – (wait)
Stability: 0.00 g
Format: TI
CR L
F
Function: The balance is tared immediately without waiting for
stability.
Notes: Applications for this command are:
– Taring of the balance during a consumption measure-
ment or during a continuous dispensing operation.
– Taring from a computer that defines the stability
criterion itself.
– Taring in an externally clocked system.
If taring is by chance performed below the startup zero
point the balance must store this zero point again. As
here a high stability is necessary; taring can take up to
12 s. No acknowledgement follows when the operation
is complete.
Example: Computer Balance
CR L
TI
F Unstable or stable state:
0.00g
21
22
5.9 Cmd: B (Base)
Format: B [
//
/
offset
//
Function: After receipt of this command the balance continu-
ously subtracts the value
results (tare preset).
Parameter:
offset
: =
Numerical value, max. 7 digits.
Enter sign only for negative values. “B
command.
offset
refers to the unit that has been programmed in the
configuration under Unit 1. The value must lie within the
admissible weighing range, i.e.
offset
+ tare weight = 0…maximum load.
offset
is rounded off to the balance resolution before
calculation.
Notes: The tare symbol appears in the display. Taring cancels
the offset command. If the offset value is outside the
weighing range, the error message “EL
transmitted.
Example: Computer Balance
B/100
CR L
]
F
offset
Display: 0.00 g
CR L
F Display: -100.00g
from all weighing
CR L
F”
cancels the
CR L
F“ will be
5.10 Cmd: U (Unit)
Format 1: U [
//
/
//
Function: Selection of the weight unit.
Parameter:
unit
: =
g, kg, lb, oz, ozt, tl, GN, dwt, ct, C.M., k., no entry (no
display of unit, Display value in the base unit of the
balance.
Entry of “U
back to the unit which is configured under Unit 1.
Uppercase letters can also be entered.
Note: The entered U command remains active until it is overw-
ritten by another command or the interface experiences
a break.
Example: Computer Balance
U/kg
Certified As
unit
balances: of Standards can be selected.
CR L
unit
]
F
CR L
F” only cancels the U command and switch
Display: 2054 g
CR L
F Display: 2.054 kg
, only units allowed by the respective Bureau
Format 2: U [
dec
]
//
/
divisor
//
[
//
/
//
name
[
//
/
//
step
] ]
CR L
F
Function: Definition of a weight unit with self-selected divisor
(scaling).
Parameters:
dec
: =
Number of places after the decimal point (truncated if
weighing result more accurate than resolution allows).
divisor
: =
Number which divides all weighing results referred to
the unit configured under “Unit 1”. Magnitude at least 1
d (smallest readout increment).
name
: =
#, PCS for display “PCS”
STK, Stk for display “Stk”
% for display “%”
step
: =
Readout increment in digits: 1, 2, 5, 10, 20, 50, 100
Without entry of
dec
, the converted values are outputted
with the maximum number of places after the decimal
point allowed by the balance.
name
With no entry of the
, no unit is either displayed or
transmitted.
step
should always be specified with balances with
DeltaRange (recallable fine range).
Example: Programing of the balance/scale as a piece counter with
the piece weight entered as divisor.
Computer Balance/scale
Load 1 PCS
123.4 g
CR L
U 0/123.4/PCS /1
F 1 PCS
Load 50 PCS
Notes:
dec , divisor , name
requirements.
and
step
can be used according to
50 PCS
Certified The U command leads to the error message “EL”.
balances: However, it is usable after configuration “Au on”.
23
24
5.11 Cmd
Format: MI [
:
MI (Modify ambient vibration) after SW version 10.42
//
/
number
//
]
CR L
F
Function: Setting the vibration adapter
(configuration of the balance via the interface)
Parameter:
number
: = Balance display
1 Very stable surroundings —
short weighing time
2 Normal surroundings _
(default setting)
3 Unstable surroundings –
relatively long weighing time
CR L
F"
"MI
resets the vibration adapter to the default
setting.
Note: The weighing time also depends on the balance model,
readout increment and on whether the animal weighing
mode has been selected.
Example: Computer Balance display
CR L
MI/3
F –
5.12 Cmd
Format: ML [
:
ML (Modify display adaption) after SW version 10.42
//
/
number
//
]
CR L
F
Function: Setting the weighing process adapter and selection
of the animal weighing mode or start of animal
weighing (configuration of the balance via the interfa-
ce)
Parameter:
number
: = Balance display
1 In dispensing, all decimal places ˛
are always displayed
2 In dispensing/weighing, the last ;
decimal place is suppressed until
stability (default setting) except if
“dd off” has been selected
3 Absolute weighing, ------ is ∞
displayed during weighing until
stability
4 Select animal weighing mode or ,
start animal weighing
CR L
F"
Entry of "ML
resets the weighing process adapter
to the default setting.
5.13 Cmd
:
MS (Modify stability detection) after SW vers. 10.42
Notes: When used for the first time, the command “ML/4”
selects the animal weighing mode; in all other cases it
starts an animal weighing.
The cycle time is selected with the MI command:
— approx. 4 s _ approx. 6 s – approx. 8 s
The result is marked with “/” for identification if the
configuration has not been changed with “Au on”.
Example: Computer Balance display
CR L
ML/1
F ∞
Format: MS [
//
/
number
//
]
CR L
F
Function: Setting the automatic stability detection (configura-
tion of automatic stability detection “ASd” via the interface)
Parameter:
number
: =
1 Coarse for good weighing results not with standing
unstable surroundings; the balance recognizes sta-
bility despite small fluctuations.
2 Default setting
3 Fine
4 Very fine, for best weighing results in stable surroun-
dings; the balance recognizes stability only if the
fluctuations remain very small.
CRL
F”
“MS
resets the stability detection to the default
setting.
Example: Computer Balance display
CR L
MS/4
F
As soon as the surroundings are
completely stable, the ASd indicator disappears.
25
26
5.14 Cmd: MZ (Modify Auto Zero) after SW version 10.42
Format: M Z [
//
/
number
//
Function: Off/on switching of Auto Zero (configuration of Auto
Zero “AZ” via the interface)
Parameter:
number
: =
0 off
1 on (default setting)
CR L
F"
"MZ
resets Auto Zero to the default setting
Notes: Auto Zero corrects zero point drifts or contamination of
the weighing pan automatically, but only in the range of
the internal decimal places not displayed.
Conditions for response of Auto Zero are:
Balance display must show 0000000 and ASd indicator
must have blanked out for at least one weighing cycle
(depends on balance model).
Example: Computer Balance display
CR L
MZ/0
F no visible effect (the zero point is
CR L
]
F
no longer automatically corrected)
5.15 Cmd: MA (Modify DeltaDisplay) after SW version 10.42
Format: MA [
//
/
number
//
Function: Off/on switching of weighing-in aid
(configuration of the DeltaDisplay “dd” via the interface)
Parameter:
number
: =
0 off
1 on (default setting)
CRL
"MA
F" resets the weighing-in aid to the default
setting.
Note: At the start of weighing-in during rapid dispensing, the
DeltaDisplay suppresses the last place of the balance
display. In fine dispensing, it is switched on again.
Example: Computer Balance display
CR L
MA/
F In dispensing/weighing the last
CR L
]
F
decimal place is suppressed until
fine weighing-in.
5.16 Cmd
:
M (Modified settings reset) after SW version 10.42
5.17 Cmd: ID (Identify)
Format: M
CR L
F
Function: Simultaneous resetting of all M commands to the
default setting
Notes: For all M commands, it generally holds that they should
not be used dynamically.
When an interface break (BREAK) occurs, the settings
made with the M commands are lost. In contrast to the
send commands, the settings are reset to the default
setting and not to the values configured using the Menu
key.
Example: Computer Balance
CR L
F Default setting of all configura-
M
tions initiated via the interface
Format: ID
CR L
F
Function: The balance sends its identification (3 lines):
< Software Version >
TYPE: < balance type >
INR: < identification number >
Example: STANDARD V10.50.00
TYPE : PM 4600
INR : 720889
CR L
CR L
CR L
F
F
F
27
28
5.18 Cmd: CA (Calibrate) after SW version 10.45
Format: CA
Function: The balance is calibrated.
CR L
F
With balances without a built-in (internal) calibration
weight, the value of the (external) calibration weight to be
loaded appears in the display. The following display
0.000 g signals that the balance should be unloaded.
The progress of the calibration is reported via the interface.
Computer Balance
CR L
CA
F busy
CB///– – – – – – –
*
CB////0.000/ g
if loaded, balance must be
unloaded
*
CB///200.000/ g
load calibration weight
*
CB////0.000/ g
unload balance
CR L
CR L
CR L
CR L
5.19 Cmd
Format: D
:
D (Display)
//
/
text
//
[ ;
unit [ symbol
] ]
CR L
F
Function: A text combined with a weight unit and a weight
symbol is displayed. “D
CR L
“D
F” frees it again for the weight display.
L
xCR
F” clears the display,
The balance continues to operate normally during the
display. The execution of send commands is not affected.
F
8.8.8.8.8.8.8
8.8.8.8.8.8.8
F
text
Parameter:
: =
G B N TAZ
All printable characters of the ISO646 code table. The
limited representation by the 7-segment display should
F
be taken into account.
text
is shown left justified. If
text
is longer than the
balance display allows, the section first inputted is cut
off.
F
* These steps are unne-
cessary with balances
with an internal calibration weight.
CB/1
CB/0
CR LF
EL
CR L
F successful or
CR L
F unsuccessful or
inadmissible
Representation of text characters in balance display
The following table shows the 7 segment display for all 95 printable
characters of the ISO 646 code table.
KK
K
''
..
'
.
''
..
ww
õõ
w
õ
ww
SP ! " # $ % & ' ( ) * • , - . /
00
11
0
00
ø123456 789: ; <=>?
cc
c
cc
@ABCDE F GH IJ K LMNO
22
1
2
11
22
AA
BB
A
B
AA
BB
ú
õõ
33
3
4
33
CC
C
D
CC
ëë
èè
ë
è
``
êê
ëë
èè
`
ê
``
êê
úú
úú
44
55
5
44
55
DD
EE
E
DD
EE
''
[[
'
''
66
77
6
7
66
77
FF
GG
F
G
FF
GG
]]
[
] °
[[
]]
88
99
8
9
88
99
HH
II
H
I
HH
II
KK
..
--
.
-
..
--
cc
c
ûû
û
ûû
JJ
J
JJ
cc
êê
ê
êê
KK
K
KK
≠
LL
MM
L
M
LL
MM
êê
--
ê
-
êê
--
..
.
..
cc
c
cc
22
2
22
NN
OO
N
O
NN
OO
unit
: = Balance display
U g (kg, lb, …; selected unit)
#, PCS PCS
STK,Stk Stk
éé
é
éé
%%
symbol
B
N (net)
T (tare)
G (gross)
: = Balance display
(brutto = gross)
B
N
T
G
PP
QQ
RR
SS
TT
UU
VV
WW
XX
YY
ZZ
òò
44
ôô
mm
P
Q
R
S
T
U
V
W
X
Y
Z
ò
4
PP
QQ
RR
SS
TT
UU
VV
WW
XX
YY
ZZ
òò
PQRSTUVWX YZ [ \] ` _
``
aa
bb
cc
dd
ee
ff
gg
hh
ii
jj
`
a
b
c
d
e
f
g
h
``
aa
bb
cc
dd
ee
ff
gg
`abcdefgh ij k lmno
PP
qq
rr
ss
tt
uu
vv
P
q
r
s
t
PP
qq
rr
ss
pqrs tuvwx yz { |}~
u
tt
uu
ww
v
w
vv
ww
i
hh
ii
xx
yy
x
y
xx
yy
kk
j
k
jj
kk
zz
ññ
z
ñ
zz
ññ
ô
44
ôô
ll
mm
l
m
ll
mm
ll
óó
l
ó
ll
óó
__
m
_
mm
__
nn
oo
n
o
nn
oo
åå
å
åå
Note: While the D command is effective, a * is shown in the top
left of the display. It indicates that the display is no longer
linked with the balance, but is controlled via the interface.
Examples: Computer Balance display
400.0 g
CR L
D/ Prog . 5
D/ 285.94; UN
Certified: For
balances configured beforehand.
29
unit
only “U” can be selected if “Au on” has been
F * Pro9. 5
N
CR L
F * 285.94 g
30
5.20 Cmd
Format: DY
Function: Entry of target weight and tolerances for checkweig-
Function: The DeltaTrac is controlled so that it supports dispensing
:
DY (Display Y)
//
[
/
target
//
hings or dispensing weighings with the DeltaTrac.
and checkweighings by analog, optical signals.
[
//
/
//
//
tol 1
[
/
tol 2
//
2 tolerance vanes appear above the
DeltaTrac and show the admissible
limits of the weight deviation.
During weighing-in, a coarse indicator
moves from 9 o-clock in the direction
of 6 o-clock and a fine indicator from
9 o-clock in the direction of 12 o-clock.
When the fine indicator is between the
two tolerance vanes, the target weight
has been reached with the selected
accuracy.
] ] ]
CR L
F
Parameters:
target
: =
Target weight; numerical value, max. 7 digits, decimal
point as required, minimum value 100 d.
tol
. : =
Admissible deviation from target weight, min. 2.5 d
Definition Weight deviation
none -2,5% +2,5%
tol 1 tol 1 tol 1
tol 1
and
target
and
“Unit 1”.
CR L
“DY
graphic indicator.
Example: Computer
DY/ 200/18/9
Balance display
DeltaTrac range from 6 to 12 o-clock corresponds to
200 g, fine indicator at –tolerance vane means weight
deviation = –9 g, at +tolerance vane = +18 g.
F” resets the DeltaTrac to the usual dynamic
downward (-) upward (+)
tol 2 tol 2 tol 1
tol
refer to the weight unit configured under
CR L
F
Notes: A possible tare preset with the aid of the B command
must be added to the target weight.
A subsequent DX command clears the DY command.
5.21 Cmd: DX (Display X) after SW version 10.42
Format 1: DX [
//
/
number
//
[
//
/
number
//
] ] [
//
/T ]
//
CR L
F
Function: Control of one or two indicators and the tolerance
vanes of the DeltaTrac
Format 2: DX [
//
/
number
//
[ -
number
] ] [
//
/T ]
//
CR L
F
Function: Control of a range between two indicators and the
tolerance vanes of the DeltaTrac
Parameter:
Number
: =
Natural number in the range 0…59, corresponding to
the minutes of a clock.
CR L
F"
"DX
fades out the controlled indicators.
Notes: The DX command is intended for a static display. For
dynamic control of the DeltaTrac as a weighing-in aid
etc., DY should be used.
A DY command following a DX command clears the DX
command.
Examples: Computer DeltaTrac
DX/15/45/T
CR L
F
DX/15 - 23
CR L
F
31
32
5.22 Cmd
Format: W
:
W (Write )
//
/
//
s0
[
//
/
//
t1
//
/
//
s1
…
//
/
//
t4
CR L
//
/
s4
]
//
F
Function: Control of a GM54 Output Module or an LV10 Auto-
matic Feeder attached to the GM socket.
The 8 output contacts are closed/opened with the 8bit status word
after time
s0
. If required, it can be overwritten
t1
with the status word s1. The W command thus allows up to 4 status changes to be
preprogrammed.
Parameter:
s (status)
=:
Decimal value between 0…255, corresponding to the
8-digit binary number which opens/closes the output
contacts C
Example: Contact C7C6C5C4C3C2C1C
. Contact closed = binary value 1.
0…C7
0
Status off off off off off off on on
Binary numb. 0 0 0 0 0 0 1 1
s
Calculation Contact C
7C6C5C4C3C2C1C0
3
of s: Dec. value 128 64 32 16 8 4 2 1
t (time)
Parameter:
=: 25…65535 (ms)
Accuracy: ± 3%, max. ± 50 ms
Note: "W
CR L
F" or an interface break opens all contacts. If the
computer sends a second W command to the balance
before the first has been executed, the first is overwritten.
Example 1: Computer W/1/500/130
GM54 Output module
C
7 C6 C5 C4 C3 C2 C1 C0
---------------------------------off-off-off-off-off-off-off-on
500 ms
on-off-off-off-off-off-on-off
Example 2: Computer
W/255/100/ 2 /200/8/300/ 32/400/128
GM54 Output module
C
7 C6 C5 C4 C3 C2 C1 C0
------------------------------------on-on-on-on-on-on-on-on
100 ms
off-off-off-off-off-off-on-off
200 ms
off-off-off-off-on-off-off-off
300 ms
off-off-on-off-off-off-off-off
400 ms
on-off-off-off-off-off-off-off
CR L
F
CR L
F
6. DataPac-M
A B
C D
E F
G H
7 8 9
4 5 6
1 2 3
0
DataPac-M keypad
6.1 DataPac-M terminal
CLEAR
.
ENTER
–
The DataPac-M terminal has three key fields:
– Function keys A…H, independent of the other keys.
– Numeric keypad 0…9 with decimal point and sign – (These keys can also be programmed
as additional function keys.)
– Correction key CLEAR and termination key ENTER, the latter can also be programmed as
a PRINT key.
The keypad operates together with the balance display as a terminal which sends and receives
data and can thus enter into dialog with a partner device, usually a computer.
With the aid of the enclosed felt pen, the function keys can be inscribed according to the
application requirements. The inscription can be removed with alcohol.
The keypad is provided with a cable with a MiniMettler connector and can be plugged into the
GM socket at the rear of the balance.
Function keys
When one of these keys is pressed, the DataPac-M immediately sends the key code KF/…(
Key
Function) to the computer:
Computer DataPac-M
/ A
KF
KF
/ B
:
KF/ H
CR L
F AB…H
CR L
F
CR L
F
Note:
The function keys can also be pressed during
a numeric entry without influencing it.
Other keys
Their action differs according to the application. It is described in what follows.
33
34
6.2 Cmd
Format: D [
:
D (Display/Dialogue mode set)
format
] [ x[
text
] ]
CR L
F
Function: Selection of the dialog mode and the format of the
response of the DataPac-M to the computer with
transmission of dialog text from the computer to the
display of the balance.
Note: General information on DataPac-M, see 1.2.
Dialog mode: There are 2 dialog modes. They can be selected through
format
the insertion or omission of
in the D command
sent from the computer to the balance.
Terminal
mode:
Parameter
Transmission of the D command with
format
:
format
sets the
DataPac-M keypad to the terminal mode. In other words,
keyed-in numeric values are written into the balance
display, can be corrected with CLEAR and are transmitted to the computer after ENTER has been pressed.
At the same time, the possibilities to enter numeric
values using the DataPac-M keypad are restricted to the
following:
format
: = Example
N (natural) Numbers from digits 0…9 1059
R (real) as N, also “-” and “.” -10.59
G (general) as R, but several “-”,“.” 1.0-5.9
Q (query) 1/0 (Display:YES/no)
With numeric entries, the DataPac-M transmits the
following codes to the computer:
Computer Balance display DataPac-M
K//123
Parameter
CR L
F 123 or weighing result 123 ENTER
text
:
This parameter is defined in the same way as in the
D command in section 5.19 (all printable characters of
the ISO646 code table).
Transmission of the D command with
//
/text over-
//
writes the balance display with text. (Transmission
with / alone overwrites it with “blanks”.)
Subsequently, only one numeric entry is possible. It
remains in the balance display even after ENTER until
the computer continues with a further D command.
CLEAR or ENTER without preceding numeric entry
transmits only its key code to the computer.
Computer Balance display DataPac-M
CR L
KFx _
KFx ^
F no change CLEAR
CR L
F no change ENTER
( _ is ASCII character hex 5F, “underline”,
^ the ASCII character hex 5E)
"Power on"
/BREAK:
x
text
Sending of the D command without
redisplays
the weighing result.
Any number of numeric entries are subsequently possible.
After ENTER, the weighing result always reappears.
CLEAR or ENTER without preceding numeric entry acts
as follows:
Computer Balance display DataPac-M
no action no change CLEAR
weighing result flashes briefly ENTER
Switching on the balance or a break in the data line
sets the DataPac-M keypad to the terminal mode as if the
command “DG
CR L
F ” had been sent.
Function
key mode:
Parameter
Sending the D command without
format
:
format
sets the DataPac-M keypad to the function key mode. Here, in the
case of numeric entries the key code is sent directly to
the computer without being shown in the balance display:
Computer Balance display DataPac-M
CR L
KD/1
KD/2
KD/3
Parameter
F flashes briefly 123
CR L
F
CR L
F
text
:
has the same function as in the terminal mode except
that CLEAR transmits its key code "KF_/
CR L
F" in all
cases.
Note: If the balance display is cleared or a text is displayed, a
* appears at the top left to show that the display is no
longer linked to the balance, but is controlled via the
interface.
35
36
Application DataPac-M, Example 1:
Weighing-in of additives 1, 2, etc. of a chemical substance No. 44
Computer Balance DataPac-M Comment
display
CR L
KF/A
F A By pressing key A of the DataPac-M keypad, the operator
requests the computer to prepare the weighing-in program for
substance No. 44 (in the computer, function key A is assigned
to the weighing-in program for substance No. 44).
DQ/SUB 44 ?
CR L
F SUb 44 ? The computer prepares the operator response by setting the
*
DataPac-M keypad to the terminal mode, at the same time the
response range of the operator is restricted to “yes/no” and
acknowledged with “Sub 44?”.
CR L
K//1
DQ/Add 1
F YES 1 ENTER The operator responds with “yes”.
CR L
F Add l The computer requests that additive 1 be weighed in.
*
*
CR L
K//1
CR L
D
F YES 1 ENTER The operator reports its readiness with “yes”.
F 0.000 g The computer initiates the display of the weighing result and
*
sets the DataPac-M keypad to the function key mode so that
ENTER acts as a PRINT key and CLEAR can be used to transmit
a correction signal.
//////12.050/g
DQ/ADD 2
CR L
CR L
F 12.050 g ENTER The operator weighs in additive 1.
F Add 2 The computer requests that additive 2 be weighed in.
*
Application DataPac-M, Example 2
Storage of the article number and determination of the weight of a series of products
Computer Balance DataPac-M Comment
display
CR L
KF/B
F B By pressing key B of the DataPac-M keypad,
the operator requests the computer to make
storage program 26 ready.
DQ/SAFE/26
CR L
F SAFE 26 The computer acknowledges with “SAFE 26”
*
and prepares a yes/no response.
CR L
K//1
F YES 1 ENTER The operator responds with “yes”.
DR/– –.– –
CR L
F – –.– – The computer requests entry of the article number
*
with – –.– – and with DR prepares a limited response
comprising numbers and a decimal point.
K//45.12
DQ
CR L
F 45.12 45.12 ENTER The operator enters the article number.
CR L
F 0.000 g The computer enables the display for the weighing
*
result and prepares a yes/no response.
S/////59.456/g
CR L
F 59.456 g The operator loads the article. The “send auto”
*
configured balance sends a stable weighing
result to the computer.
DR/ – –.– –
CR L
F – –.– – The computer requests the operator to enter the
*
next article number.
37
7. Programs to get started
38
7.1 Communication with the balance
The below auxiliary programs enable a computer to operate as a simple
terminal. They can be used to send control commands via the interface
to the balance and likewise to display a weighing result and status
message on the screen. It is thus possible to observe the basic mode
of action of the commands.
Interface parameters (default setting of the balance):
2400 baud, even Parity, 7 data bits and 1 stop bit
Warning: The punctuation must be adhered to exactly when typing
in the programs.
Terminal program for IBM-PC
1Ø OPEN "coml:24ØØ,E,7,1,CS,CD,DS,RS,LF" AS #1
2Ø IF LOC(1)>Ø THEN PRINT INPUT$(LOC(1),#1);
3Ø K$=INKEY$ : IF K$< >"" THEN PRINT#1,K$; : PRINT K$;
5Ø GOTO 2Ø
Terminal program for Epson HX-20
1Ø TITLE "TERM"
2Ø WIDTH2Ø,4
3Ø OPEN"O",#1,"COMØ : (57E1F)"
4Ø OPEN"I",#2,"COMØ : (57E1F)"
5Ø IF LOF (2)>Ø THEN PRINT INPUT$(LOF(2),#2);
6Ø K$=INKEY$:IFK$< >"" THEN PRINT#1,K$; :PRINTK$;
7Ø IF K$=CHR$(13)THEN K$=CHR$(1Ø):PRINT#1,K$; :PRINTK$;
8Ø GOTO 5Ø
Terminal program for Epson PX-4
1Ø OPEN "O",#1,"COMØ:(C7E1F)"
2Ø OPEN "I",#2,"COMØ:(C7E1F)"
3Ø IF LOC(2) >Ø THEN PRINT INPUT$(LOC(2),#2);
4Ø K$=INKEY$ : IF K$< > "" THEN PRINT#1,K$; : PRINT K$;
5Ø IF K$=CHR$(13) THEN K$=CHR$(1Ø) : PRINT#1,K$; : PRINT K$;
6Ø GOTO 3Ø
7.2 Evaluation of the weighing data
For further processing of the weighing result the data string from the
interface must be analyzed. The data string structure shown in section
4.3 can be examined as follows:
1. Read in data string
2. Examine first three characters of the data string
(i.e. S//, SD/, SI, SI+, SI–, TA, EL, ET, ///, /D/, ...)
3. Process remaining data string in accordance with the first part
Program example in BASIC
Evaluation of the string
"S///////23,4 g"
Identification
X$ is the received data string from the balance
6Ø IDENT$ = LEFT$(X$, 3) (search for identification)
7Ø IF IDENT$ = "S//" THEN GOSUB 110
further distinctions with IF as listed under paragraph 2.
11Ø WEIGHT = VAL (MID$ (X$, 3)) (search for weighing result)
12Ø LE = LEN (X$) (search for weight unit, 120...160)
13Ø FOR I = LE-1 TO 1 STEP –1
14Ø ST = INSTR(I,X$," ") : IF ST <> Ø THEN I = 1
15Ø NEXT
16Ø UNIT$ = RIGHT$(X$,LE-ST)
further processing of WEIGHT and UNIT$
leading zeros
7.3 Use of commands to control the balance
Evaluation of the weighing data
Program example in PASCAL
GetString1 = Input buffer
BEGIN
inputstring :=GetString1;
Weight := ''; Unit :=''; j := 1;
Ident := Copy (inputstring, 1, 3);
IF Ident = 'S ' THEN
BEGIN
WHILE (Ord (inputstring[j]) < 65) AND
(j <=Length (inputstring)) DO
BEGIN
Weight := Weight + inputstring[j];
j := j + 1;
END;
Unit := Copy (inputstring, j, 4);
END ELSE
further distinctions with IF as listed under paragraph 2,
further processing of Weight and Unit
END.
Program example in C
char InputString[3Ø];
char Unit[5];
char Ident[4];
float Weight;
sscanf(InputString,"%3s%f%s",Ident,&Weight,Unit);
if(strcmp(Ident,"S") == Ø) /* stable weight */;
Use of base, unit, DeltaTrac and send and repeat command
(bidirectional communication)
Task: Control of packages with small parts (e.g. screws) with
the aid of the DeltaTrac
Weight of package (tare) 51,50 g
Piece weight of parts 1,58 g
Number of parts per package 100
PCS
Tolerances for DeltaTrac +1 PCS = 1,85 g
–5 PCS = 7,90 g
Program in BASIC for EPSON PX-4:
1Ø OPEN "I",#1"COM0:(C7E1F)"
2Ø OPEN "O",#2"COM0:(C7E1F)"
3Ø PRINT#2,"B 51.5" (tare preset)
4Ø PRINT#2,"U0 1.58 PCS 1" (integer number of pieces in single steps)
5Ø PRINT#2,"DY 209.5 1.58 7.9" (target weight and tolerances for DeltaTrac)
6Ø PRINT#2,"SR" : CLS
7Ø INPUT#1,X$ : PRINT X$
8Ø GOTO 70
9Ø END
Note for users of Epson HX-20:
Only the interface parameters in lines 10 and 20 are different, “C7E1F”
changes to “57E1F”.
39
40
8. Malfunctions
8.1 What happens if …?
… one of the following error messages
is transmitted at the interface?
ES A received command is wrong (Syntax Error); the required command structure has not been
adhered to.
EL A received command is semantically (in content) wrong (Logistical Error). It is syntactically
correct but can not be executed for some reason or other.
Example: tare command, if balance in overload or underload.
ET The received character sequence has not been correctly received (Transmission Error).
Probably the transmission parameters of computer and data interface of the balance do not
match.
… the data output is too slow/too fast? The standard setting for the pause between the data strings is 1 second (for GA44
Printer).The pause can be selected in the configuration register, sector I-FACE:
PAUSE 0, H, 1, 2 seconds. H = handshake, no pause.
… functions not be executed Owing to technical improvements, certain functions have been changed or supplemented.
as described? The start message on the balance display or the version of the software used must be
checked.
Possibly the balance in question is a certified unit in which certain functions are blocked in
compliance with national regulations.
… the balance displays – – – – – –? The “busy line” shows that the balance is busy. It appears when the balance/scale is waiting
for stability after taring, after weighing-in ( ∞ ) or in animal weighing. However, it also
shows that the computer is receiving keypad entries of the DataPac-M – transmitted in the
handshake mode, see 3.1. – too slowly.
In troubleshooting note also the operating instructions of the balance.
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Thank you.
Subject to technical changes and to the availability
*P702178*
of the accessories supplied with the instruments.
© Mettler-Toledo GmbH 1998 702178A Printed in Switzerland 9809/2.12
Mettler-Toledo GmbH, Laboratory & Weighing Technologies, CH-8606 Greifensee, Switzerland
Phone +41-1-944 22 11, Fax +41-1-944 30 60, Internet: http://www.mt.com
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