Chapter 5
30
Once you have changed the input filter cutoff frequency, continue
with the STP9820 configuration using the instructions in the next
section.
Installing a Relay Driver for the Digital Output Lines
The STP9820 allows you to install a Toshiba TD62083AP (or
equivalent) relay driver for use with the digital output lines on the
DT9820 Series module. This driver, which works only with TTL
digital output lines, allows the digital output lines of the DT9820
Series board to drive most commercially ava5 V relays with
up to 100 mA of current and +5 V of user-supplied power.
Table 4: Resistor Locations on the STP9820 Used to
Modify the Input Filter Cutoff Frequencies
Analog Input
Channel
Remove Resistors
from Locations...
Install Resistors in
Locations...
0
R2 and R4
R3 and R5
1
R7 and R9
R8 and R10
2
R12 and R14
R13 and R15
3
R17 and R19
R18 and R20
CAUTION:
The ex5 V power supply voltage must not exceed 5.25 V or
damage may result to the DT9820 Series module.
