Agilent Technologies Turbo-V 551 Rack Notice De Mode D'emploi page 220

17 Technical Information
Connection J1 Remote I/O Interconnections
Figure 10
If any signal isn't applied (no connection) the driving frequency is set
to "Maximum ROTATIONAL frequency" (the default value is 650 Hz;
it is settable via serial line by means of window 121: see the serial
command table).
If a continuous signal is applied (for example pin 5 connected to pin
9 and pin 6 connected to pin 15  t
is set to "Low Speed" (the default value is 715 Hz; it is settable via
serial line by means of window 117: see the serial command table).
The "Low Speed" function can also be activated by serial
communication with window 1, and the low speed value can be
adjusted via window 117.
Both low speed value (win.117) and high-speed value (win.120) are
limited between 440 Hz (value that can't be set by the user) and
"Maximum excitation frequency" (win.121, 715 Hz default).
SOFT START: input signal (opt osolated) to activate the Soft Start
function. This function must be activated (pin 7 shorted with pin 9
and pin 8 shorted with pin 15) if the pump remains unused for a
protracted stop, and de-activated for the next run-up. See the
paragraph "SOFT START" for a more detailed description.
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/T = 0%) the driving frequency
off
(A)