tecan cavro xlp 6000 Operating Manual page 56

3 - Software Communication
Initialization
3.4.2
3 - 24
k <n> Syringe Dead Volume Command
The [k] command sets the number of increments that the plunger drive is
offset from the top of travel. This is to minimize dead volume. The syntax for
this command is:
[k<n>]
where:
<n> = the offset in increments from top of travel
<n> = 0..255 (122 is the default)
<n> = 0..2040 in fine positioning and microstep modes (976 is the default)
Under default initializations, the plunger moves upward until it contacts the top
of the syringe, causing a forced stall initialization. The plunger then moves
downward and upward, leaving a small gap between the syringe seal and the
top of the plunger. This small gap was designed so that the Teflon seal does
not hit the top of the plunger each time the syringe moves to the "home"
position. This maximizes the life of the syringe seal.
The [k] command must be followed by the Initialization command [Z], [Y], or
[W]. Each time the unit is powered down, the "k" value will return to the default
condition.
For example, to offset 10 increments away from the top of travel, send the
following commands:
– k10R
– ZR
Initialization Commands
Z <n , n n > Initialize Plunger and Valve Drive (CW Polarity)
1 2, 3
The [Z] command initializes the plunger drive and homes the valve in a
clockwise direction. Valve ports are numbered 1..X, starting in a clockwise
direction at the first port after the syringe port. The default initialization speed
is 500 pulses per second.
n = Set initialization plunger force/speed
1
n = Set initialization input port
2
n = Set initialization output port
3
The parameters are described below.
Cavro® XLP 6000 Modular Syringe Pump Operating Manual, 734237-C, en