Bio-Rad BioLogic Signal Import Module (SIM) - Manual (Page 57)

2.8.4 Other Gradient Pumps
The BioLogic DuoFlow system sends a TTL signal to control an external pump. This signal is normally TTL
high (5 volts). The DuoFlow system commands the external pump to run by holding Pin 4 "low". Any pump
accepting this signal may be used with the DuoFlow system as a sample loading pump. Refer to your
pump’s separate documentation when connecting the pump to the DuoFlow system.
DESCRIPTION OF SYSTEM COMPONENTS SYSTEM OVERVIEW
2-44