Metrohm 807 Dosing Unit - Manual (Page 29)

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3 Installation
846 Dosing Interface
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4 Program the barcode reader in such a way that the ASCII character
02 (STX or Ctrl B) is sent as the first character. This first character is
normally referred to as the "Preamble" or "Prefix Code".
5 Program the barcode reader in such a way that the ASCII character
04 (EOT or Ctrl D) is sent as the last character. This last character is
normally referred to as the "Postamble", "Record Suffix" or "Postfix
Code".
6 Exit the programming mode.
3.5.6 Connecting a USB hub
If you wish to connect more than two devices to the USB connector of the
846 Dosing Interface, you can also use an additional commercially availa-
ble USB hub (distributor). If you operate the 846 Dosing Interface with the
help of the Touch Control, then you should use a USB hub with its own
power supply.
Connect the USB hub as follows:
1 Switch off the Touch Control and/or exit the PC software.
2 With the aid of the 6.2151.020 cable, connect the USB connector
(type A) of the 846 Dosing Interface with the USB connector of the
hub (type B, see manual for the hub).
3 Switch on the Touch Control.
The USB hub is recognized automatically.