Agilent 8453 Dissolution Testing System Installing and Operating Manual 103
Using the Valve Unit and Valve-pump Controller 4
Servicing Your Valve System
The ready line Rdy(-) is read by the GP-I0 port of the spectrophotometer
during a read cycle, see Figure 44. It is “0” when the valve-pump controller is
ready to deliver position feedback data from the valve of the channel which is
addressed.
Figure 43 GP-IO Write Cycle
Figure 44 GP-IO Read Cycle
R/W (-)
DV (-)
data/
address
t
1
t
d
t
h
t
2
address
R/W (-)
DV (-)
data
rdy (-)
t
1
tt
2
t
g
h
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