Two digital inputs devices can be connected to the VBOX 3i with the use of an additional splitter box, as shown in the
image below.
https://en.racelogic.support//Product_Info/VBOX_Data_Loggers/VBOX_3i_Range/VBOX_3i_User_Guide_(All_Variants)/09_-
_VB3i_Analogue_and_Digital_I%2F%2FO
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