SeaLevel SeaConnect 370 User manual

1
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
SeaConnect 370
User Manual | 370W and 370C

2
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Contents
CONTENTS...........................................................................................................................................................2
BEFORE YOU GET STARTED ...............................................................................................................................3
INTRODUCTION ................................................................................................................................................... 5
SEACONNECT 370 HARDWARE DESCRIPTION.................................................................................................9
HARDWARE CONFIGURATION..........................................................................................................................16
WIRING OPTIONS ..............................................................................................................................................31
MOD+ CONNECT IOS APP ................................................................................................................................38
SEAMAX APPLICATION SUITE .........................................................................................................................41
ACCESSORIES....................................................................................................................................................50
APPENDIX A – HANDLING INSTRUCTIONS ....................................................................................................51
APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................52
WARRANTY ........................................................................................................................................................53

3
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Before You Get Started
What’s Included
370W-A SeaConnect Wi-Fi Data Acquisition Module
SeaConnect 370W Wi-Fi multifunction I/O edge module
Includes optional 1-month trial SeaCloud subscription plan (Must order Item# SC00W)
100-240 VAC to 5 VDC @ 4 A desktop power supply with US power cord (TR151-US)
10 Insulated Jumper Wires (CA603)
370C-AV00 SeaConnect Wi-Fi and Cellular Data Acquisition Module
SeaConnect 370C LTE CAT 1 Cellular & Wi-Fi multifunction I/O edge module
LTE Ultra-Wideband 3 dBi+ dipole sail antenna (104264)
Includes optional 1-month trial SeaCloud subscription plan with 25MB cellular data (Must order
Item# SC00C)
100-240 VAC to 5 VDC @ 4 A desktop power supply with US power cord (TR151-US)
10 Insulated Jumper Wires (CA603)

4
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
QSM100-KT SeaConnect QuickStart Module
SeaConnect QuickStart Demonstration Module (QSM100)
12V/5V 3000 mAh Dual-Output Battery Pack & 12 V AC/DC Charger (104752)
Spider Cable with 4 Cable Groups and 14 Color Insulated Wires (CA595)
USB Power Cable with Type A Connector to Tinned Leads (CA606)
All items can be purchased from our website (www.sealevel.com) by calling our sales team at
[phone].
Advisory Conventions
Warning
The highest level of importance used to stress a condition where damage could result to the
product, or the user could suffer serious injury.
Important
The middle level of importance used to highlight information that might not seem obvious or a
situation that could cause the product to fail.
Note
The lowest level of importance used to provide background information, additional tips, or other
non-critical facts that will not affect the use of the product.

5
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Introduction
The SeaConnect 370 has a small form-factor I/O board featuring a TI CC3200 Cortex ARM-M4 MCU with
integrated Wi-Fi capability. The SeaConnect 370 can also be configured with a cellular modem. It includes
2 Form C relays, 4 discrete inputs, and 2 12-bit A/D converters, each configurable independently for either
0–10 VDC voltage measurement or 0–24 mA current measurement mode. There is also provision for
connecting 1-Wire temperature probes.
The SeaConnect 370 features a powerful built-in event engine that can easily be configured using an
intuitive web-based interface to trigger actions when pre-defined conditions are met. For example, if a tank
level is too high or valve pressure out of range, the SeaConnect event engine can log data to SeaCloud to
alert that action should be taken. This helps automation engineers, technicians, production managers, and
network operators make critical decisions.
Industry Segments
SeaConnect 370 modules are perfect for a wide variety of applications and environments including:
1. Data Acquisition
2. Broadcast Automation
3. Security
4. Facility Management

6
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Specifications
•ARM Cortex-M4 Core at 80 MHz
•Embedded Memory Options
oIntegrated Serial
oRAM (up to 256KB)
oPeripheral Drivers in ROM
•1 I2C interface on header (for OEM use)
•2 12-Bit Differential Analog-to-Digital Converters (ADCs)
•2 Form C Relay Outputs
•4 Digital Inputs (dry or wet)
•1 1-Wire bus interface
•Wireless (802.11b/g)
oSupported Protocols: Modbus TCP, TCP/IP, UDP, DHCP, and HTTP
oWPA2 Personal Security
oCrypto Engine for Secured WLAN Connections with 256-Bit Encryption
oInfrastructure and Access Point modes
•Cellular options:
o4G Cat 1 LTE modem
o4G Cat 3 LTE modem with GPS (Call)
•Supports Industry Standard Modbus TCP Protocol
•Status and Activity Indicator LEDs
•Field-Removable Terminal Block Connectors
•5 VDC Power Input
•−20°C to 70°C (-4°F to 158°F) Operating Temperature
•Compact Size – 4.00"(L) x 2.03"(W) x 1.13"(H) (excluding mounting flanges and antenna
connector)

7
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Operations
The SeaConnect 370 is designed with features and connectivity compatible with the Sealevel eI/O and
SeaI/O modules. Tools available for either will work with the SeaConnect 370. In addition to being able to
be used on a LAN, the SeaConnect 370 supports WAN connectivity to the cloud service DWEET.IO and the
Sealevel SeaCloud.
The SeaConnect 370 can be used on a LAN without connectivity to any cloud service as with traditional
SeaI/O devices using the SeaConnect 370 web interface, SeaMAX software, our mobile app Mod+ Connect,
or native Modbus protocol. See SeaMAX Application Suite and MOD+ CONNECT sections below for details.
Simply configure the 370 to use the Modbus protocol then connect to your local LAN infrastructure. The
370 will then respond to traditional Modbus commands that allow you to read and write the I/O on the
device.
The SeaConnect 370 is equipped with additional features that facilitate WAN data collection to the cloud
via Wi-Fi or Cellular network connectivity. This is the default configuration of the 370. In this mode, the 370
can be configured to send data to the cloud via some triggering event, like when a digital input changes
state or an analog value crosses a predefined threshold.
The SeaConnect 370 supports both DWEET.IO and the Sealevel SeaCloud service. DWEET.IO is a free cloud
service that will let you get started sharing data to the cloud. See https://dweet.io for more information on
using the DWEET.IO service.

8
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
SeaCloud
The SeaConnect 370 is natively supported by the Sealevel SeaCloud cloud service. The Sealevel SeaCloud
service is a secure, robust, scalable, Industrial IoT (IIoT) platform designed to track, monitor, control and
analyze data from Sealevel I/O devices. With SeaCloud you can:
Manage devices
Monitor connectivity status over time
Control available relay and digital outputs
e-Mail and SMS alarms whenever something need attention
Diagnose issues remotely
Provision fielded units
Brand your Instance
At its heart, SeaCloud was designed as an application platform (PaaS) for many different applications and
companies. The SeaConnect 370 interacts with the SeaCloud SeaConnect Instance, but many application-
specific Instances can be supported from the base platform. SeaCloud has all the features needed to
support most IIoT applications with more features being developed daily.
Do you have an IoT idea? Do you need an application-specific device and cloud solution? Sealevel can
provide a number of services from design, application-specific cloud instance, cellular data plans, and even
billing services for a turn-key solution. Sealevel would love to work with you to realize your IoT vision.

9
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
SeaConnect 370 Hardware Description
SeaConnect Configurations & Specifications
The SeaConnect-370 includes removable screw terminals, which simplify field-wiring connections. The
specifications below based on the underlying hardware of the 370. Actual values may vary depending on
your application.
Discrete Inputs
Number of Channels 4
Voltage Range 3-30VDC
Response Time 4 microseconds
Form C Relay Outputs
Number of Outputs 2
Contact Rating 2A
Maximum Switching Power 30W, 30VA
Maximum Switching Voltage 60VDC, 30VAC
Maximum Carrying Current 2A
Operate Time 5ms max.
Release Time 5ms max.
Differential A/D Inputs
Number of Channels 2
Resolution 12-bit (10-bit effective)
Sampling Rate (ADC)
Fixed sampling rate of 16 μs per channel
(Equivalent to 62.5 k Samples/sec per channel)
Fixed round-robin sampling across all channels
Input Range 0–10VDC or 0–24mA (software-configurable)
Input Impedance 900k
1-Wire
Maximum simultaneous devices 10

10
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Configurations Parasite power and dedicated power
Chips supported DS18B20
DS18S20
Power
Power Input 5 VDC @ 3A max via terminal block
Environmental
Operating Temperature -20°C to +70°C (-4°F to 160°F)
Humidity 10% to 90% RH (non-condensing)
Mechanical
Dimensions 5.10” W X 2.03” H X 1.13” D (enclosure)

11
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Dimensional Drawing
Figure 1: 370W Enclosure Dimensions (inches)

12
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Figure 2: 370C (inches)

13
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Wireless Module Information
SeaConnect wireless modules have an internal antenna and are compatible with 802.11b, 802.11g, and
802.11n wireless networking equipment operating in the 2.4GHz frequency spectrum. The specifications
below based on the underlying hardware of the 370. Actual values may vary depending on your application.
Wireless Specifications
Standards
2.4 GHz IEEE 802.11b/g/n WLAN
Channels
1–11
Frequency Range
2.412 – 2.484 GHz
TX Power
17 dBm at 1 DSSS
17.25 dBm at 11 CCK
13.5 dBm at 54 OFDM
RX Sensitivity
–94.7 dBm at 1 DSSS
–87 dBm at 11 CCK
–73 dBm at 54 OFDM
Application
Throughput
UDP: 16 Mbps max
TCP: 13 Mbps max
Range
1150’ (on-board antenna)
Outdoors with no obstructions or interference
WLAN
2.4 GHz IEEE 802.11b/g/n WLAN
Supported Protocols: Modbus/TCP, TCP/IP, UDP, DHCP, HTTP, HTTPS,
TCP/IP Stack, TLS 1.2
Antenna
Internal
1Outdoor line of sight. Actual range may vary.

14
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
1-Wire Technology
Overview
1-Wire is a serial protocol technology designed by Dallas Semiconductor Corp. (now Maxim Integrated) that
provides low-speed data, signaling, and power over a single contact plus ground interface. The major
features of the 1-Wire bus are:
Single Contact Sufficient for Control and Operation
Unique 64-bit ID Factory-Lasered into Each Device
Power Derived from Signal Bus ("parasite power")
Multidrop Capable: Supports Multiple Devices on Single Line
Exceptional ESD Performance
For an overview of 1-Wire technology, visit:
https://www.maximintegrated.com/en/app-notes/index.mvp/id/1796, “Overview of 1-Wire Technology
and Its Use” or https://www.maximintegrated.com/en/products/1-wire/flash/overview/ for a tutorial.
The 1-Wire bus system uses a single primary controller to control one or more secondary devices. The
SeaConnect 370 is the primary controller for up to 10 secondary devices. When there is only one secondary
device on the bus, the system is referred to as a “single-drop” system; the system is called “multidrop” if
there are multiple secondary devices on the bus.
1-Wire devices are available in one of two modes: parasite power and dedicated power. Parasite power
mode devices use two wires, which provide (1) data with parasite power and (2) ground. Dedicated power
devices use three wires, where the third wire is dedicated to power. In the case of a dedicated power device,
it is required to use the dedicated power line, since the device will not operate in parasite power mode.
The SeaConnect 370 supports temperature probes built with the Maxim Integrated DS18S20 and DS18B20
1-Wire devices, which are described below. Such devices are available in various form factors.
The DS1820, a 9-bit device (now obsolete), was replaced by the DS18S20 as a drop-in replacement from a
hardware and software perspective, with the exception that the DS18S20 requires 750ms for conversion
compared with only 500ms for the DS1820.
The DS18B20 improves upon the DS18S20 by providing additional resolution. Maxim recommends the
DS18B20 for new designs.

15
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
DS18S20
The Maxim Integrated DS18S20 is a digital thermometer providing 9-bit Celsius temperature
measurements. It measures temperatures from −55°C to +125°C with ±0.5°C accuracy from −10°C to
+85°C.
The DS18S20 is offered in parasite power and dedicated power modes. For this device, the use of parasite
power is not recommended for temperatures above 100°C. In applications in which such temperatures are
likely, it is strongly recommended to use a dedicated power mode DS18S20.
DS18B20
The DS18B20 and DS18S20 devices are very similar. The difference is that the DS18B20 gives 12 bits of
precision as compared to the DS18S20, which gives 9 bits of precision. The DS18B20 measures
temperatures from −55°C to +125°C with ±0.0625°C accuracy from −10°C to +85°C. Both devices have a
conversion time of 750ms.

16
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Hardware Configuration
Wireless Connection Modes
Wi-Fi Access Point Mode
In this mode, the SeaConnect 370 functions as an access point and broadcasts its own private network
with its own SSID, to which up to one client can connect. This mode is typically used for first-time setup
and configuration. The SeaConnect 370 will not have access to any other Wi-Fi networks while in this mode.
Wi-Fi Infrastructure Mode
In this mode, the device functions as a network client. It will attempt to connect to an access point defined
by another SSID. The list of SSIDs are defined as wireless network profiles via the local Web configuration
page. This mode is the normal use case for the Wi-Fi modules, as it allows the device to connect to
SeaCloud and for connections with other clients on the local network.
If no profiles are defined (see section Profiles), the SeaConnect 370 will automatically enter AP Mode upon
boot. If at least one wireless profile is defined, the SeaConnect 370 will boot into Infrastructure Mode by
default.
See Entering Access Point Mode Manually for instructions on overriding boot mode.
Cellular Connection
The 370C ships from the factory with an approved antenna and a cellular modem activated and configured
to communicate with the Sealevel SeaCloud service.
Cellular Antenna Considerations
Primary Antenna Requirements
Frequency 700MHz, 1700MHz
Bandwidth LTE B4 (1700): 445MHz
LTE B13 (700c): 41MHz
Impedance 50 ohm
Input Power >24dB
For applications not using the supplied antenna, you must ensure that the selected antenna(s) meet the
following gain requirements:
Frequency Max Gain
700 MHz Band 10.41 dBi
1700 MHz Band 6.5 dBi

17
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Status Indicator LEDs
Status LED
The Status LED (labeled STAT on the enclosure) indicates device status. The following LED legend
applies to both the Wi-Fi and Cellular versions of the SeaConnect 370.
Table 1: Status LED Legend
Behavior Condition
Flash once at boot Infrastructure Mode
Flash twice at boot AP Mode
Fast flashing Network unavailable
Slow flashing Network connectivity without SeaCloud connection
Solid on Connected to SeaCloud
Activity LED
The Activity LED (labeled ACT on the enclosure) flashes to indicate data transfer between the device and
the Sealevel SeaCloud service.
Setup
The SeaConnect 370 runs an on-board HTTP server at port 80. Connect to the same network as the 370
and point your web browser to the device's web page. Depending on the platform you are using, the address
is in one of the following formats:
•The IPv4 address, e.g., http://192.168.1.1/ (all platforms)
•The NetBIOS name, e.g., http://SL370-21XXXX/ (Windows only)2
•The mDNS name, e.g., http://SL370-21XXXX.local/ (iOS only)
Your browser will ask for a username and password (Figure 3). The default HTTP Authentication username
is “admin”, and the default password is unique to your device and is printed on the bottom of the device.
2Here and elsewhere in this manual, “21XXXX” is a placeholder for the last 6 digits of the
device’s unique MAC address, which is printed on the bottom of the device.

18
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Figure 3: Web server authentication prompt
First Boot
Power the SeaConnect 370 using the provided 5V DC power supply.
The SeaConnect 370 will boot up in AP mode when shipped from the factory and/or configured to default
settings, or when there are no wireless profiles defined. The Status LED will blink twice briefly to indicate it
is booted in AP mode. The Status LED will then blink rapidly. At this point, use a Wi-Fi connected computer
or mobile device to connect to the SSID “SL370-21XXXX” (Figure 4).
Figure 4: Connecting to the wireless access point

19
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
Profile Configuration
Once you have connected to the device AP, open a web browser, and navigate to the URL
http://192.168.1.1. Enter the default HTTP Basic Authentication credentials. The username is “admin,” and
the password is printed on the bottom of the device. The I/O page will load (Figure 5, Figure 6).
Figure 5: I/O Page (desktop view)
Figure 6: I/O page (Android phone view)

20
© Sealevel Systems, Inc. SeaConnect 370 Manual | SL9269 11/2022
On the navigation bar at the top of the page or in the hamburger menu, click “Profiles.” Click the circular
Add button to begin adding a new profile. Enter the SSID of the existing wireless infrastructure network, the
security type, and the security key, and the priority, then click the Save button (Figure 7).
Figure 7: Add Profile dialog
The page will refresh, and you will be presented with an alert instructing you to restart the device for your
changes to take effect. The “Profiles List” table on the same page will update with an entry for the profile
that was just added (Figure 8).
Figure 8: Profiles list showing the new profile and alert
Skip to the next step if your infrastructure network is configured for DHCP.
Otherwise, visit the Network page to configure your Infrastructure Mode IP settings (Figure 9).