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Pin assignment of bottom 14-pin screw terminal block:
Pin Name Description
1
DO
100 mA, 30V max.
2
DI
3.5V ~ 30V
3
D1+
DATA+ pin of COM1 (RS-485)
4
D1-
DATA - pin of COM1 (RS-485)
5
CTS1 Clear To Send of COM1 (RS-232)
6
RTS1 Request To Send of COM1 (RS-232)
7
GND
Signal ground of RS-232
8
TXD1 Transmits Data of COM1 (RS-232)
9
RXD1 Receives Data of COM1 (RS-232)
10 INIT* Initial pin, 3.5V ~ 30V
11 D2+
DATA+ pin of COM2 (RS-485)
12 D2-
DATA - pin of COM2 (RS-485)
13 +VS
V+ of power supply (+10 to +30VDC unregulated)
14 GND
GND of power supply
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 & RS-485 at the same time.
Pin assignment of top 14-pin screw terminal block:
15 RXD3
16 TXD3
17 RXD4
18 TXD4
19 GND
20 RXD5
21 TXD5
22 RXD6
23 TXD6
24 GND
25 RXD7
26 TXD7
27 RXD8
28 TXD8
I-7521/I-7522/I-7522A/I-7523/I-7524/I-7527 User's Manual,Ver2.5 Aug.2015
RXD pin of COM3 (RS-232)
TXD pin of COM3 (RS-232)
RXD pin of COM4 (RS-232)
TXD pin of COM4 (RS-232)
GND pin of COM3/4/5/6 (RS-232)
RXD pin of COM5 (RS-232)
TXD pin of COM5 (RS-232)
RXD pin of COM6 (RS-232)
TXD pin of COM6 (RS-232)
GND pin of COM5/6/7/8 (RS-232)
RXD pin of COM7 (RS-232)
TXD pin of COM7 (RS-232)
RXD pin of COM8 (RS-232)
TXD pin of COM8 (RS-232)
22
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