Agilent Technologies Turbo-V 551 Rack Notice De Mode D'emploi page 226

17 Technical Information
Connection J1 Remote I/O Interconnections
Input / Output Electrical Specifications
Figure 17
PURGE/VENT VALVES: the Turbo-V 551 TwisTorr Pumping System
can integrate the Purge and Vent valves. The two valves are Normally
Closed (N.C.) so if a power fail occurs, the valves will remain closed.
The valves operating mode can be set by serial communication with
WIN 125 or using front panel interface (see following diagram for
details). The valve operating mode can be changed only with the
pump in STOP status.
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Input / Output electrical specifications
Turbo-V 551 Rack Controller User Manual / 87-901-031-01 (A)