ICP DAS USA I-7521, User Manual

Page: 29 / 148

I-7521/I-7522/I-7522A/I-7523/I-7524/I-7527 User’s Manual,Ver2.5 Aug.2015
29
1.6.5. Using DI/DO of I-7521(D)
(valid for I-7521(D)/I-7522(D)/I-7523(D))
Ext. GND
Ext. 24V
10
9
8
7
6
11
5
4
12
13
GND
+VS
D2-
D2+
DO3
DO1
DO2
INIT*
2
1
Data+
TXD
4
5
6
7
8
3
9
RXD
Data-
RTS
I-7521
DI3
DI2
CTS
N/C
GND
N/C
X1
X2
X3
3
2
1
COM1
Dry contact or TTL/CMOS
or (3.5V to 30V D/I)
Inductive load or
Conductiv e load
Current Limit Resistor
Load current <= 125mA
U?
2003A
1
3 14
2
4
5
6
9
16
15
13
12
11
10 7
8
B0
B2 C2
B1
B3
B4
B5
COM
C0
C1
C3
C4
C5
C6 B6
E
DO1
DO2
DO3
GND
+VS
DIO24
DIO29
DIO30
7521
12
6
5
4
13
+5V
UA
74HCT08
1
2
3
R2
10K
R1
10K
D/I
TO_CPU
7521
D/I Block Diagram
D/O Block Diagram