Hach 900 MAX - Manual (Page 35)

Section 2
Page 33
8990hrd.fm Auxiliary Receptacle Pin Identification
2.9.1 Splitter Interface
Use the Splitter Interface (Cat. No. 939) when more than one signal is needed
simultaneously. Connecting the interface to the 6-pin connector on the
sampler provides three additional connectors. Two or more interfaces may be
connected in series to allow for additional connections.
Figure 16 Splitter Interface