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Pin assignment of 13-pin screw terminal block(I-7523/I-7523D):
Pin Name Description
1
CTS3 Clear To Send of COM3 (RS-232)
2
RTS3 Request To Send of COM3 (RS-232)
3
RXD3 Receives Data of COM3 (RS-232)
4
TXD3 Transmits Data of COM3 (RS-232)
5
GND
Signal ground of COM3 & COM4
6
TXD4 Transmits Data of COM4 (RS-232)
7
RXD4 Receives Data of COM4 (RS-232)
8
DI2
Digital input, 3.5V ~ 30V
9
INIT*
Initial pin, 3.5V ~ 30V
10
D2+
DATA+ pin of COM2 (RS-485)
11
D2-
DATA- pin of COM2 (RS-485)
12
+VS
V+ of power supply (+10 to +30VDC
unregulated)
13
GND
GND of power supply
Pin assignment of COM1 connector (DB-9 Male):
Pin Name Description
1
Data+ DATA+ of RS-485 port
2
TXD
Transmits Data (RS-232)
3
RXD
Receives Data (RS-232)
4
N/C
No Connection
5
GND
Signal ground of RS-232
6
N/C
No Connection
7
CTS
Clear To Send (RS-232)
8
RTS
Request To Send (RS-232)
9
Data- DATA- of RS-485 port
Note: The COM1 can be used as a RS-232 port or a RS-485 port. It
is not recommended to use both RS-232 and RS-485 at the same
time.
I-7521/I-7522/I-7522A/I-7523/I-7524/I-7527 User's Manual,Ver2.5 Aug.2015
18
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