I/O Timing - Sony LT20 Series Instruction Manual

Alarm output
This is set to "L" (ON) by pressing the reset key or by the
terminal reset input after eliminating the various causes of
the alarm.
Comparator value selection input
The four comparator value pairings set in the display unit
can be selected.
Pin #∞ Pin #§
(Upper limit CPH, lower limit CPL)
CPH1, CPL1
H H
CPH2, CPL2
L H
CPH3, CPL3
H L
CPH4, CPL4
L L
DRQ display/output hold feature
While the DRQ signal is "L" (ON) the display and output
(BCD, Go/No Go output of terminals) of termianls are
stored.
(When the BCD output form is set to
output data is held on DRQ becoming "H" (OFF).)
However, when the initial setting of pin !™!¢ of the terminals is
changed from , set at the time of shipping, to
hold function of the display and output of terminals is enabled
only for pin !™!¢ of the terminals, and the DRQ hold function
operates only for the BCD output data.
Comparator value
, only the BCD
, the

7-2. I/O timing

1-@∞ Data, #º DRQ input, #¡ READ output
• When Initial setting
DRQ (IN)
READY (OUT)
DATA (OUT)
MAX. 3 ms
• When Initial setting
DRQ (IN)
READY (OUT)
DATA (OUT)
MAX. 3 ms MAX. 2 ms MIN. 2 ms
(See P53 for factory-set.)
MAX. 2 ms MIN. 2 ms
65