Xylem Lab 850, starting from serial number 09470315 - Manual (Page 38)

Operation Lab 850
38 ba75890e01 11/2009
4.6 Transmitting data
The meter has a RS232 interface (serial port).
Via the interface, you can transmit data to a PC and update the meter
software.
The RS232 interface enables to transmit data to an external printer.
Note
The relevant interface cable has to be connected if you want to
download data to an interface (USB or RS232).
CAUTION
The interface is not galvanically separated.
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as incorrect values would result.