Service Manual
Page 41 of 50
§
Order of events:
§
The POS-system transmits one of the
Records 01, 03, 04 or 05
.
§
The scale answers with
Record 11
.
§
Example: STX 11 ESC 247 ETX (transmit record 10, use random number 47H)
§
The POS-system now calculates the checksums, encodes and transmits them by
record 10
to the
scale.
§
The scale responds Record 10 first with
ACK
.
§
The POS-system continues as with a normal weighing operation by transmitting
EOT ENQ
.
§
Only now the scale responds the validity of the checksums by
Record 11
.
§
If the checksums were valid, the scale transmits STX 11 ESC 1 ETX otherwise STX 11 ESC 0 ETX.
§
Regardless whether the response was positive or negative, the POS-system has to repeat the original
weighing operation.
Status information
The POS-system is able to get status information from the scale by record 08.
Version number on/off
The POS-system can display the version number of the software in the scale. If the scale receives record
20 EOT STX 20 ESC
1
ETX, it will display the version number until it receives EOT STX 20
0
ETX. All
other records will be ignored in between!
Please note that all dialogues must be initiated by the POS-system with
EOT
,
AND
also every response of
the scale has to be answered by the POS-system with
EOT
!
6.1.4 L2 Mettler-Toledo
6.1.4.1 Connector and Data Format
Connector: 7-pin. Receptor (round)
Fa. Binder Series 680
Plug pin out RS232:
Pin 1 GND
Pin 2 RXD
Pin 5 TXD
RS232 scale communication parameter:
ASCII,
7 data bits,
1 stop bit,
1 start bit,
Parity - odd,
2400 baud
All data for this protocol is sent Most Significant Digit first.
All data is sent in ASCII format.
Examples:
Spaces have been added here for clarity, do not send spaces.
Set price to 1.23
G00123<CR><LF> = 0x47 0x30 0x30 0x31 0x32 0x33 0x0D 0x0A
Set Price to 1.23 with Tare value of 123g
G00123<CR><LF> =
0x47 0x30 0x30 0x31 0x32 0x33 0x54 0x30 0x31 0x32 0x33 0x0D 0x0A
