User`s manual

NexSens Technology, Inc.
iSIC User‟s Manual 6
Digital and Analog Connectors
Two 16-pin un-pluggable terminal strip connectors are located inside the enclosure. Power and
sensors will be connected to these terminals. The connector on the left is for connecting digital
and smart sensors. The connector on the right is for connecting analog sensors. Descriptions for
the pins on both connectors are given below:
A factory installed option for analog, digital, and galvanic dissolved oxygen sensor expansion is
available. The interface connections for expansion are located behind the battery.
Digital Connector
SDI-12: Connection for SDI-12 sensors.
SW.A: 12V, 200 mA power switch.
BAT: Pass-through battery power pin
(fused)
GND: Ground (digital)
P1.Rx: RS-232 Receive Pin (Port 1) - Input
P1.Tx: RS-232 Transfer Pin (Port 1) - Output
P2.Rx: RS-232 Receive Pin (Port 2) - Input
P2.Tx: RS-232 Transfer Pin (Port 2) - Output
P3.Rx: RS-232 Receive Pin (Port 3) - Input
P3.Tx: RS-232 Transfer Pin (Port 3) - Output
DIO0: General purpose Digital I/O.
DIO1: General purpose Digital I/O.
Rain: Tipping bucket rain gauge input
Analog Connector
Tip: Telephone wire connection pin
Ring: Telephone wire connection pin
Ex.5V: 5V Excitation voltage
AD0 – AD7: Analog Inputs
AGND: Analog ground
DA0: Digital to Analog output
Expansion Connector
See Appendix B: iSIC System with Expansion
Connector for wiring.