7 Connection of Analytical Balances and Printers
7.1 Connection of Analytical Balances
As it often happens that the sample is weighed in on an analytical balance, it makes sense to connect this
balance to the TitroLine
®
7500 KF. To connect the balance to the TitroLine
®
7500 KF, the balance must have a
RS232-C-interface and the connection cable must be configured accordingly. For the following types of balances
there are already assembled connection cables:
7.1.1 Balance TZ-Number
Sartorius (all types), partially Kern, TZ 3092
Mettler AT, PR, PM TZ 3093
Mettler, AB-S, AG, PG TZ 3099
Precisa XT-Series TZ 3183
Kern with 9-pole RS232 TZ 3180
For all other types of balances it is possible to obtain an already assembled connection cable (on demand). For
this we need detailed information about the RS232-C-interface of the balance used.
The connection cable is to be connected to the RS232-C-interface 2 of the TitroLine
®
7500 KF. This side of the
connection cables always consists of a 4-pole mini-plug. The other side of the cable can, depending on the type
of balance, be a 25-pole plug (Sartorius), a 9-pole plug (Mettler AB-S) or a 15-pole specialised plug (Mettler AT)
etc.
In order to allow the balance data to be sent to the TitroLine
®
TitroLine
®
7500 KF, the data transmission
parameters of the titrator and the balance must correspond to each other. Additionally, it is necessary to carry out
some more standard settings on the side of the balances:
The balance is to send the balance data via RS232-C only by means of a print command.
The balance is to send the balance data only after the display standstill.
The balance should never be set to ‘automatic sending’ and/or ‘send continuously’.
‘Handshake’ on the balance must be set to ‘off’, or even ‘Software Handshake’ or ‘Pause’.
No special characters such as S or St are allowed to be used as prefix in the balance data of the balance
data string. In such a case it might be possible that the TitroLine® 7500 KF cannot process the balance data
correctly.
After you have connected the balance with the appropriate cable to the TitroLine® 7500 KF and have adjusted all
settings in the balance software, and possibly in the TitroLine
®
7500 KF, you can now test the data transfer of the
balance very easily. Start the method. After conditioning, press Enter to start the sample titration. Confirm the
sample ID. Then, the display asks you:
a) To press the print-button at the balance Parameters to ‘weighted sample automatically’
b) To enter the weighted sample then the parameters are still set to ‘weighted sample manually’
Put an object onto the balance and press the print button. After the standstill of the balance display there will be
beep at the TitroLine® 7500 KF and the transmitted balance data appear:
a) After approx. 5 sec. in the display and the display changes automatically into the measuring display.
b) The weighted sample must again be confirmed with <Enter> or <OK>.
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