KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
GB Interface Description
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Page 2
KERN EW-A01
Versie 1.0 08/99
EW-A01-SB-e-9910
E
KERN EW/EG
Interface Description
Table of contents
1 FUNCTION OF PINS 3
2 INTERFACE SPECIFICATIONS 4
3 OUTPUT DATA: TRANSMISSION DATA 5
3.1 Transmission data formats 5
3.2 Polarity 6
3.3 Data 6
3.4 Units 6
3.5 Status of data 7
4 INPUT COMMAND: RECEPTION DATA 7
4.1 Transmission procedure 7
4.2 Input command format 8
4.3 External tare command 8
4.4 Output control setting 8
5 SETTING OF BALANCE FUNCTIONS 9
6 EXAMPLE OF CONNECTION WITH A PERSONAL COMPUTER 10
2
EW/EG-SB-e-9910
1 Function of pins
4
Pin No. Signal Output/Input Functions
1 --- ---
2 DTR Output High level with balance power “ON“
3 RXD Input Receiving data
4 TXD Output Transmitting data
5 GND --- Signal ground
Applicable plug: TCP0556-01-0201 (Hoshiden) included.
1
3
2
5
EW/EG-SB-e-9910
3
2 Interface specifications
1) Transmission method:
2) Transmission speed
3) Transmission code
4) Signal level
5) Contents of a word:
6) Parity bit:
Data Logic “1”
Data Logic “0”
1 2
Serial data transmission, random access
1200/2400/4800 bps
ASCII code, 8-bit
Base on EIA RS232C
High level: Data logic “0” +5 to +15 V
Low level: Data logic “1” –5 to –15 V
8-bit word based on ASCII standard character codes,
1 start bit, 2 stop bits, no parity bit
Nil
MSBLSB
4
5
7
63
8
910
11
Start bit
Data bit
Stop bit
4
EW/EG-SB-e-9910
3 Output data: transmission data
3.1 Transmission data formats
One of the following three formats is selectable by function setting of EW/EG
balances, function A PrF. See page 6 and refer to page 9 of the operating
instructions for EW/EG balances.
6-digit data format, consists of 14 words, including terminators; CR = ODH, LF =
OAH.
Remark: With EW/EG models set function 9.Ai “0” and function A.PrF “1”. In
other words, while the auxiliary indication is set effective, no transmission will
be done.
Function A. PrF “1”
1 2 3 4 5 6 7 8 9 10 11 12 13 14
P1 D1 D2 D3 D4 D5 D6 D7 U1 U2 S1 S2 CR LF
1. Standard format as above 1., but the auxiliary indication is also transmitted by
EW/EG models. Consists of 14 words, including terminators; CR = ODH, LF =
OAH.
Function A. PrF “2”
1 2 3 4 5 6 7 8 9 10 11 12 13 14
P1 D1 D2 D3 D4 D5 D6 D7 U1 U2 S1 S2 CR LF
2. EN format with “/” before last digit in auxiliary indication with EW/EG models.
While functions set at 9. Ai “0” and A. PrF “1”, transmission will be done as above
1. Consists of 15 words including terminators; CR = ODH, LF = OAH.
Function A. PrF “3”
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
P1 D1 D2 D3 D4 D5 D6 D7 D8 U1 U2 S1 S2 CR LF
EW/EG-SB-e-9910
5
3.2 Polarity
P1 = 1-word
P1 Code Contents
+ 2BH Data is 0 or positive
- 2DH Data is negative
sp 20H Data is 0 or positive
3.3 Data
D1 to D7, 7 words with 6-digit format, above 1.
D1 to D8, 8 words with auxiliary indication transmission, to conform to EN standards.
D * Code Contents
0~9 30H~39H Data 0 to 9 (Max. 6 digits with 6-digit data format)
(Max. 7 digits with auxiliary indication)
(Max. 7 digits with auxiliary indication and EN
format
•
SP 20H Space; Leading zero suppression
/ 2FH Inserted before the last digit with setting to EN format and
2EH Decimal point, position is unfixed. There is a case transmitting
a space in the last digit instead of a decimal point.
auxiliary indication.
3.4 Units
U1, U2 = 2 words based on ASCII codes
U1 U2 Contents Symbol
sp G Gram g
C T Carat ct
L B Pound lb
6
O Z Ounce oz
EW/EG-SB-e-9910
3.5 Status of data
S2 = 1 word
S2 Code Contents
S 53H Data stabilized
U 55H Data unstabilized (fluctuates)
E 45H Erroneous data; all data unreliable except S2. Balance reads
o-Err, u-Err.
sp 20H No specified status.
4 Input command: reception data
The balance is available to control by transmitting command from external device
with this PR-1 interface pack. Types of the commands are:
1. External tare command
2. Output control setting
4.1 Transmission procedure
1) Transit command to the balance from external device. Command transmission is
free from output timing out of the balance, because the system is full duplex.
2) If the command is properly received, the balance transmits acknowledgment
(ACK, code 06H). If the command is erroneous, the balance transmits nonacceptance (NAK, code 15H).
In ordinary display modes of the balance, ACK or NAK will be replied in 1 second
after transmission of the command.
In such operation of the balance as settings of unit weight, judgment values,
function parameters, or in calibration, ACK or NAK will be replied after the
operation of the balance is completed. Don’t send next command before receiving
the response, ACK or NAK.
EW/EG-SB-e-9910
7
4.2 Input command format
Consists of 4 words, including terminators; CR = 0DH, LF = 0AH
1 2 3 4
C1 C2 CR LF
4.3 External tare command
C1 C2 Code Contents
T sp 54H 20H Tare command
4.4 Output control setting
C1 C2 Code Contents
0 0 4FH 30H No output (command input is available)
0 1 4FH 31H Constant output
0 2 4FH 32H Constant output in stabilization (no output in
unstabilization)
0 3 4FH 33H One output by every pressing of print key “P”
0 4 4FH 34H Automatic output
0 5 4FH 35H One output in stabilization (no output in
unstabilization)
0 6 4FH 36H One output in stabilization (constant output in
unstabilization)
0 7 4FH 37H One output when data is stabilized after print key
pressed
0 8 4FH 38H One output at once
0 9 4FH 39H One output after stabilization
Remarks:
* The performance of both output controls by commands “00~07” and by the setting
of balance function are the same. For further information about each performance of
the output control, refer to Various Functions.
** The performance by “08 and 09” are specific by INPUT COMMAND.
Once any command of “00~09” is performed, the status will be kept until next
command input. However, once the power is turned off, the output control status will
return to the primary one, function setting status.
8
EW/EG-SB-e-9910
5 Setting of balance functions
Output control, transmission speed and print format are selectable by setting of
balance functions. The contents is as in the following table. As to setting operation,
refer to the operating instruction of the balance.
*1 Output interval of data in constant transmission is 0.1 sec. to 1 sec., depending on
weighing condition and setting of functions.
Output control
6.OCO
6.OC1
6.OC2
6.OC3
6.OC4
6.OC5
6.OC6
6.OC7*
Baud rate
7.GL1
7.GL2
7.GL3
Weight unit
8.SET1
8.SET2
8.SET3
8.SET4
Auxiliary indication
9.A10
9.A11
GLP printing
0.GLP0
0.GLP1
Format for auxiliary
A.PRF1
indication**
A.PRF2
A.PRF3
*
* Settings made when delivered from factory.
** Formats for auxiliary indication is effective when the lock switch is OFF, free. While
the lock switch is ON, functions will not be displayed but the balance performs just as
set when it was free.
No data transmitted
Constant serial transmission. *1
Serial transmission of stabilized data only
One transmission by command from printer
Auto-transmission with loading an object
One transmission of stabilized data only
One transmission when stabilized, serial for else
One stabilized data by command from printer*
1200 bps
2400 bps
4800 bps
“g” only*
g/ct switchable
g/oz (lb) switchable
g/ct/oz (lb) switchable
No auxiliary indication*
Auxiliary indication is effective
No transmission for GLP printing*
GLP printing transmission is effective
No transmission of auxiliary indication
Standard format while auxiliary indication
EN format with “/” before the last digit in auxiliary
indication. Ex. 200.00/5*
EW/EG-SB-e-9910
9
6 Example of connection with a personal computer
PC-9801 (NEC)
Computer
DB 25P
TXD
RXD
GND
DCD
RTS
CTS
DSR
DTR
2
3
7
8
4
5
6
20
RXD
3
4
5
TXD
GND
Balance
DIN 5P
1
2
DTR
10
EW/EG-SB-e-9910
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