104 Agilent 8453 Dissolution Testing System Installing and Operating Manual
4 Using the Valve Unit and Valve-pump Controller
Servicing Your Valve System
Pump Drive Logic
When pump select signal is active, data-in lines DXIN (from the
spectrophotometer) define in which direction the pump of the selected
channel has to turn.
The output lines, Pump On, CCW and Direction, CW will remain in the last
stage, until new information is entered from data-in lines.
Valve Latch, Buffer U1
The data-in lines DXIN (from the spectrophotometer) provide the position
setpoint for the valve of the selected channel to the valve latch, if the valve
select line is active.
The actual position is given to the spectrophotometer on the data-out lines
DXOUT through buffer U1 in case of a read cycle.
Tab le 25 Pump Actuation (DXIN) Lines only (assuming a pump is addressed)
D1IN D0IN
Pump off 1 0
Direction, CW 0 0
Pump on, CCW 0 1
Tab le 26 Valve Position Lines (assuming the valve unit is connected and addressed)
D2OUT
D2IN
D1OUT
D1IN
D0OUT
D0IN
Position 1 0 0 0
2001
3010
4011
5100
6101
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