User Manual

7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----22
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 RXD pin of COM3 (RS-232)
16 TXD3 TXD pin of COM3 (RS-232)
17 RXD4 RXD pin of COM4 (RS-232)
18 TXD4 TXD pin of COM4 (RS-232)
19 GND GND pin of COM3/4/5/6 (RS-232)
20 RXD5 RXD pin of COM5 (RS-232)
21 TXD5 TXD pin of COM5 (RS-232)
22 RXD6 RXD pin of COM6 (RS-232)
23 TXD6 TXD pin of COM6 (RS-232)
24 GND GND pin of COM5/6/7/8 (RS-232)
25 RXD7 RXD pin of COM7 (RS-232)
26 TXD7 TXD pin of COM7 (RS-232)
27 RXD8 RXD pin of COM8 (RS-232)
28 TXD8 TXD pin of COM8 (RS-232)