Digi Connect Sensor User manual

Digi Connect® Sensor
I/O Wiring Guide

Revision history—90001493
Revision Date Description
A May 2016 Initial release.
B October 2016 nAdded C1D2 certification information.
nAdded wiring compliance information.
C March 2017 nAdded HART® protocol information.
nAdded Serial Power section for use with Modbus.
nUpdated 4/20 mA current loop section.
D April 2017 Added registered trademark symbol to HART®.
E March 2018 Updated the "About" section.
Trademarks and copyright
Digi, Digi International, and the Digi logo are trademarks or registered trademarks in the United
States and other countries worldwide. All other trademarks mentioned in this document are the
property of their respective owners.
© 2018 Digi International Inc. All rights reserved.
Disclaimers
Information in this document is subject to change without notice and does not represent a
commitment on the part of Digi International. Digi provides this document “as is,” without warranty of
any kind, expressed or implied, including, but not limited to, the implied warranties of fitness or
merchantability for a particular purpose. Digi may make improvements and/or changes in this manual
or in the product(s) and/or the program(s) described in this manual at any time.
Warranty
To view product warranty information, go to the following website:
www.digi.com/howtobuy/terms
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customers get the most out of their Digi product. For information on Technical Support plans and
pricing, contact us at +1 952.912.3444 or visit us at www.digi.com/support.
Digi Connect® Sensor I/O Wiring Guide 2

Contents
Digi Connect® Sensor
About the Connect Sensor I/O interface
Connect Sensor hardware replacement 5
Digi Device Cloud and Digi Remote Manager 5
Safety notices and certifications 5
CSENSE Continuous Monitoring firmware 5
Use a Modbus-enabled device with CSENSE Continuous Monitoring firmware 6
I/O interface pin assignments
9-pin connector details 7
12-pin connector details 8
Wire sensors to the I/O interface
Power options
Power Connect Sensor 13
Power the sensors 13
Analog input
Voltage input 16
Self-powered 16
3-wire sensors 16
Current loop 16
Self-powered 17
2-wire (loop-powered)sensors 17
3-wire sensors 18
Digital I/O
Digital input and pulse counter 20
Digital output 21
Modbus serial power output
I/O schematics
Analog input schematic 24
Digital I/O schematic 25
Digi Connect® Sensor I/O Wiring Guide 3

Digi Connect® Sensor
Connect Sensor is a low-power cellular sensor gateway for wireless drop-in networking to remotely
monitor industrial environments and control systems, such as pipeline flow, air pressure, and light
levels. To power Connect Sensor, use either the internal battery or an external power source, such as
solar panels, for setups with no power or limited power.
Connect Sensor includes an external input/output (I/O) interface inside a waterproof enclosure for
connecting third-party sensors. The sensors gather information (sensor readings) from their
environment, and Connect Sensor reports that information to Digi Remote Manager® using a low-
bandwidth cellular connection. You can sign in to your Remote Manager account to view the reports or
use the Digi Connect Wizard app on a mobile device and pair it with a nearby Connect Sensor to view
real-time sensor and device data in the field.
Note Make sure there is adequate cellular network coverage where you plan to install the gateway
before purchasing cellular service.
This guide shows you how to wire analog or digital I/O sensors and power to Connect Sensor. See the
Digi Connect Sensor User Guide for details about setting up the Connect Sensor device, configuring
sensors and reports, and viewing sensor data.
Digi Connect® Sensor I/O Wiring Guide 4

About the Connect Sensor I/O interface
You can wire analog and digital inputs and outputs on the Connect Sensor general purpose I/O
interface.
Note If you are using a Modbus-enabled external sensor device, you must wire the sensor device to a
serial output. Note that the Modbus protocol is available only with Connect Sensor+.
Make sure Connect Sensor has cellular connectivity before wiring sensors to the I/O interface. After
setting up Connect Sensor and wiring the I/O interface, use Remote Manager to remotely configure
I/O settings.
Connect Sensor hardware replacement
Connect Sensor hardware can be replaced with Connect Sensor+ hardware, which provides additional
external device monitoring features, such as using the HART®protocol and the Modbus protocol.
Digi Device Cloud and Digi Remote Manager
To serve our customers most effectively, Digi International Inc. consolidated its cloud services, Digi
Device Cloud and Digi Remote Manager®, under the Remote Manager name. This phased process does
not affect device functionality or the functionality of the web services and other features. However,
you will find instances of both Device Cloud and Digi Remote Manager in some documentation,
firmware, and user interfaces.
Safety notices and certifications
Digi products are designed to the highest standards of safety and international standards compliance
for the markets in which they are sold. However, cellular-based products contain radio devices that
require specific consideration. Make sure you read and understand all of the safety notices, warnings,
and cautions for this product. Digi International assumes no liability for failure to comply with the
safety precautions.
See the Connect Sensor User Guide for details about safety and certification for Connect Sensor.
CSENSE Continuous Monitoring firmware
When you update Connect Sensor with the CSENSE Continuous Monitoring firmware option, Connect
Sensor supports only one power output (A1 Pwr), which is on all the time. Multiple sensors can share
this supply, but all sensors must have the same input voltage and must be wired to A1 Pwr.
Digi Connect® Sensor I/O Wiring Guide 5

About the Connect Sensor I/O interface CSENSE Continuous Monitoring firmware
Digi Connect® Sensor I/O Wiring Guide 6
Use a Modbus-enabled device with CSENSE Continuous Monitoring
firmware
If you have a Modbus-enabled device that must get power from Connect Sensor, the Modbus device
must be wired to the serial power output. However, if you have updated Connect Sensor with the
CSENSE Continuous Monitoring firmware option, the Modbus device must be wired to A1 Pwr (analog
interface 1 power output). The Modbus device must have the same input voltage as any other device
wired to A1 Pwr.
Note The Modbus protocol is available only with Connect Sensor+ hardware.

I/O interface pin assignments
Connect Sensor has two I/O connectors—a 9-pin connector and a 12-pin connector.
The pin assignments and signals are shown in the following images and tables.
9-pin connector details
Digi Connect® Sensor I/O Wiring Guide 7

I/O interface pin assignments 12-pin connector details
Digi Connect® Sensor I/O Wiring Guide 8
Pin number Assignment Signal
1 SGnd Serial interface ground
2 SRX/- Serial interface Modbus -
3 STX/+ Serial interface Modbus +
4 SPwr Serial interface power output
5 EXT GND IN External power supply, ground
6 EXT PWR IN External power supply, positive input
7 DGnd Digital interface, ground
8 DIO Digital interface I/O
9 DPwr Digital interface power output
12-pin connector details
Pin number Assignment Signal
1 A4 GND Analog interface 4, ground
2 A4 IN Analog interface 4, analog input
3 A4 Pwr Analog interface 4, power output
4 A3 GND Analog interface 3, ground
5 A3 IN Analog interface 3, analog input
6 A3 Pwr Analog interface 3, power output

I/O interface pin assignments 12-pin connector details
Digi Connect® Sensor I/O Wiring Guide 9
Pin number Assignment Signal
7 A2 GND Analog interface 2, ground
8 A2 IN Analog interface 2, analog input
9 A2 Pwr Analog interface 2, power output
10 A1 GND Analog interface 1, ground
11 A1 IN Analog interface 1, analog input
12 A1 Pwr Analog interface 1, power output

Wire sensors to the I/O interface
To wire third-party sensors to the Connect Sensor I/O interface, you need the following equipment:
nA slot-headed 0.4 x 2.5 x 80 mm screwdriver
nWire size 1.29-0.25 mm (16-30 AWG) for each pin connector
Note All external or field wiring must be in accordance with NFPA 70 Article 501.10(B).
To wire sensors to the I/Ointerface:
1. Open the Connect Sensor enclosure and disconnect all power sources.
CAUTION! You must disconnect power from Connect Sensor before wiring
sensors to the I/O interface.
Digi Connect® Sensor I/O Wiring Guide 10