Xylem H-3521 - Manual (Page 14)

2-4 Installation
H-3521
Figure 6 Connector & Terminal Strip
2.6 Connecting Your Data Logger
The H-3521 has RS-232, SDI-12 and Modbus “smart” digital interfaces together with a 4-20mA
analog output. The H-3521 is a SDI-12 V1.3 compliant sensor excluding the CRC commands. It
connects directly to any data recorder with SDI-12 capability. The instrument housing has both a
7 pin main interface connector and a 3 pin RS-232 communication connector.
7-pin Circular Connector 3-pin Circular Connector
Pin Color Function Pin Color Function
1
2
3
4
5
6
7 Orange
Brown
Blue
Green
Black
Red
Yellow RS485+(Modbus)
RS485-(Modbus)
4-20mA+
4-20mA-
GND
+12V Power
SDI-12 Data 1
2
3 N/A
N/A
N/A RS232(TxD)
RS232(RxD)
GND