NEW BRUNSWICK SCIENTIFIC BioFlo 415 Manual To Operations page 35

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Figure 8: Inputs & Outputs for Ancillary Equipment
Two USB serial ports are available on the control cabinet rear panel (see Figure 8) for
the connection of serial ancillary devices such as scales for vessel and addition bottles.
You can connect a box with four serial (RS232) inputs and outputs to one USB port to
allow you to connect and control up to four scales or other ancillary equipment.
New Brunswick Scientific User's Guide