Broadcast Tools I/O Sentinel 4 G2 User manual

Installation and Operation Manual
PROBLEM SOLVED
Due to the dynamic nature of product design, the information contained in this
document is subject to change without notice. Broadcast Tools, Inc., assumes no
responsibility for errors and/or omissions contained in this document. Revisions
of this information or new editions may be issued to incorporate such changes.
Broadcast Tools® is a registered trademark of Broadcast Tools, Inc.
All Sentinel® labeled products are registered trademarks of Broadcast Tools, Inc.
Copyright® 1989 - 2022 by Broadcast Tools, Inc. All rights reserved.
No part of this document may be reproduced or distributed without permission.
Visit www.broadcasttools.com for important product update information.
Manual update: 3/2/2022
For firmware versions equal to or greater than 2.05.
If you need a firmware upgrade, contact Broadcast Tools®
No part of this document may be reproduced or distributed without permission.
ALL SPECIFICATIONS AND FEATURES FOR THIS PRODUCT ARE SUBJECT TO
CHANGE WITHOUT NOTICE
NOTE: We recommend the use of Chrome, Firefox or Safari as your browser.
I/O Sentinel 4 G2
Web-enabled four status/logic input, four relay output module
INC
®

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I/O Sentinel 4 G2 Installation and Operation Manual
Table of Contents
Section Title Page #
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Who to Contact for Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Surge Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
UPS Standby Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LAN / NET Ethernet Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chassis Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Cable Prep. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Relay Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Status Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reset to Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Ethernet “Quick Start” Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Opening the LOGIN Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Web Setup/Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
“Login” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
“Monitor/Control” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
“User Setup” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
“I/O Setup” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
“Email/Network Setup” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
“Show Alarms” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
“About” Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Front and Rear Panel silkscreen views . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
Fractional Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
TCP Relay Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
HTTP/CGI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
WEBSITE:
Visit our web site for
product updates and
additional information.
2
CONTENTS

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I/O Sentinel 4 G2 Installation and Operation Manual
INTRODUCTION
INTRODUCTION
Thank you for your purchase of a Broadcast Tools® I/O Sentinel 4 G2 (referred to as
the I/O Sentinel 4 G2 throughout this manual). We’re confident that this product will
give you many years of dependable service. This manual is intended to give you all
the information needed to install and operate the Broadcast Tools® I/O Sentinel 4 G2.
SAFETY INFORMATION
Only qualified technical personnel should install the I/O Sentinel 4 G2. Any attempt
to install this device by a person who is not technically qualified could result in a
hazardous condition to the installer or other personnel or damage to the I/O Sentinel
4 G2 or other equipment. Please ensure that proper safety precautions have been
taken before installing this device. If you are unfamiliar with this type of equipment,
please contact a properly qualified engineer to handle the installation and setup of
the I/O Sentinel 4 G2.
WHO TO CONTACT FOR HELP
If you have any questions regarding your product or you need assistance, please con-
tact your distributor from whom you purchased this equipment. If you would like
more information about BROADCAST TOOLS® products, you may reach us at:
Broadcast Tools, Inc.
131 State Street
Sedro-Woolley, WA 98284-1503 USA
Voice: 360.854.9559
Fax: [phone]
Internet Home Page: www.broadcasttools.com
E-mail:[email protected]
THANK YOU FOR CHOOSING
BROADCAST TOOLS® BRAND PRODUCTS!
CAUTION!
Broadcast Tools®
Products, as with any
electronic device, can
fail without warning.
Do not use this product
in applications where a
life threatening condition
could result due to failure.
NOTE:
This manual should be
read thoroughly before
installation and operation.
WEBSITE:
Visit our web site for
product updates and
additional information.
Broadcast Tools is a Veteran Owned Business
Designed, Assembled and Supported in WA State, USA

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I/O Sentinel 4 G2 Installation and Operation Manual
OVERVIEW
Product Overview
The I/O Sentinel® 4 G2 is a robust, full-featured Ethernet based data acqui-
sition and remote-control device with four optically isolated status (logic) inputs and
four programmable relay outputs. The I/O Sentinel® 4 G2’s four optically isolated
status/logic inputs may be configured for wet or dry (contact closure) status/logic
monitoring. The four one-amp SPDT relay outputs may be configured for ON, OFF,
pulsed or reboot operation.
The I/O Sentinel® 4 G2 can be controlled and monitored locally and/or
remotely over any IP network, including private networks, IP-based industrial con-
trol networks, and the Internet. Users can operate the product using a web browser
or web-enabled mobile device. Email notification may be configured to alert up to
eight email or SMS-email addresses. Logging of system status, along with the site
ID may be emailed in time spans from once an hour to once a day. SNMP traps and
SET/GET to allow multiple units to be monitored and controlled with SNMP man-
agement software.
The I/O Sentinel® 4 G2 may be paired with a second I/O Sentinel® 4 G2 to
form an IP-based “4 Channel Bi-directional Status/Relay Extension Cord”.
Features/Benefits
• Four optically isolated inputs configurable for dry signals or wet signals (5-24
VDC, or 25-48 VDC via an external resistor.)
• Four SPDT relay outputs.
• Plug-in euro-block screw terminals for status and relay connections.
• Built-in web server provides simple, web-based (HTML5) notification, monitor-
ing, configuration, and control.
• Email and SMS-email alarm notification for input, outputs, and logs.
• Remote control and monitoring via SNMP GET/SET and traps.
• Logging of all user selected input status with site ID information which may be
emailed from once an hour to once a day, along with hourly snap-shot function-
ality.
• Nine front panel I/O activity LED indicators.
• Rear panel RJ-45, 10/100base-T LAN/Ethernet interface.
• Fully RFI proofed.
• Surge protected internal power supply, universal switching power supply with
domestic connector supplied. International power supply optional.
• Three units may be mounted on one RA-1 one-RU 19” rack shelf.
Applications
• Web-enabled back-up transmitter ON/OFF control system.
• One end of a full-duplex four channel web-enabled I/O extension cord.
• Relay control and status monitoring via a web browser, SNMP, and/or user
defined PC application.
WEBSITE:
Visit our web site for
product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
INSTALLATION
Inspection
Please examine your I/O Sentinel 4 G2 carefully for any damage that may have been
sustained during shipping. If any damage is noted, please notify the shipper imme-
diately and retain the packaging for inspection by the shipper. The package should
contain the I/O Sentinel 4 G2, a BLUE straight-through CAT 5 cable, a GRAY
crossover CAT 5 cable and a 9-12 VDC power supply. Manuals may be downloaded
from our web site.
Installation
Surge Protection
The I/O Sentinel 4 G2 has built-in resistance to voltage changes; we recommend that
you use a power surge protector or line conditioner on the incoming AC line.
Lightning strikes and/or other high voltage surges may damage your I/O Sentinel 4
G2 and connected equipment if it is not properly protected. For lightning protection
devices, check out www.polyphaser.com and www.itwlinx.com.
UPS Standby Power System
We recommend that you power your I/O Sentinel 4 G2 from an uninterruptable
power supply (UPS) system. A UPS, like the BE600M1 from APC, helps minimize
the risk to the I/O Sentinel 4 G2 and provides power during a power outage.
Power
Connect the 2.1mm barrel type center positive power connector into the unit and the
9 to 12 VDC power supply with domestic connector into a 120 Vac 50-60 Hz power
source.
CAUTION!
Installation of the I/O
Sentinel 4 G2 in high
RF environments should
be performed with care.
The station ground
should be connected to
the “Chs Gnd” chassis
ground screw.
NOTE:
Never use any type of
power supply other
than the specified/sup-
plied power supply.
WEBSITE:
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product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
INSTALLATION
LED Indicators
“Pwr/HB” LED: Illuminates when power is applied and flashes to indicate micro-
processor operation. (Green)
“INPUT” LEDs 1-4: Lit when the corresponding status input is on. (Green)
“OUTPUT” LEDs 1-4: Lit when the corresponding relay output is on. (Red)
LAN / NET Jack
RJ45 Ethernet jack for 10/100baseT LAN/WAN connection.
Chassis Ground (Chs Gnd)
This #4-40 sized chassis ground screw should be tied to the station (house) or sys-
tem ground.
Cable Prep
The I/O Sentinel 4 G2 interfaces to external equipment through removable euro-
block screw terminals. The terminals accommodate wire sizes from 16 - 28 AWG
solid or stranded wire. Before installing a wire, remove the euro-block screw termi-
nal plug and turn each capture screw fully counterclockwise. Strip each conductor
to a length of 0.25” and insert the conductor fully into the terminal. Turn the capture
screw fully clockwise to secure the conductor.
Relay Outputs
The I/O Sentinel 4 G2’s relay outputs are SPDT normally open/dry. Make your con-
nections to the desired relays, K1 thru K4. Front panel LEDs indicate when a relay
is active.
CM = Common Relay Contact (wiper)
NO = Normally Open Relay Contact
NC = Normally Closed Relay Contact
CAUTION!
Installation of the I/O
Sentinel 4 G2 in high
RF environments
should be performed
with care. The station
ground should be con-
nected to the designat-
ed “Chs Gnd” ground
terminal.
WEBSITE:
Visit our web site for
product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
INSTALLATION
Status Input
Each optically isolated input has a terminal labelled “xA” and a terminal
labelled “xB”. Inputs can be configured for either wet or dry operation via internal
jumpers. The factory default configuration is dry, where the “A” side of the input is
ground (GND) and the “B” side of the input is the cathode (-) of the opto-isolator.
In this configuration 5V is applied internally to the anode (+) of the opto-isolator.
This configuration is best for interfacing with external dry contact relay outputs,
switches, and open collector outputs.
In the “wet” configuration an external voltage must be applied to the input
to activate the opto-isolator. When configured for wet operation the “A” side of the
input is the anode (+) and the “B” side of the input is the cathode (-). This configu-
ration is best where full isolation is preferred or when interfacing with external volt-
age/logic level outputs.
Each optically isolated input is connected through an internal 2.2k ohm
series current-limiting resistor directly to an opto-coupler circuit so no external
resistor is necessary if the input voltage is between 5 and 24 VDC. Higher DC volt-
ages, from 25 to 48 VDC, can be used but must be reduced with an additional exter-
nal resistor of the appropriate value and power rating to limit the input current.
Here is how to calculate the value and power rating of an external current
limiting resistor for DC voltages up to 48 VDC: Each opto-isolated input has an
internal 2.2K ohm series resistor. The opto-isolator works well with an input current
of 9 mA and has a voltage drop of around 1.2V. With this information we can deter-
mine the correct external series current limiting resistor value needed for other volt-
ages using the equation:
R = ((Vin-1.2)/0.009)-2200
Where:
R = External resistor value required
Vin = Desired input voltage
1.2 V = Forward voltage drop of the LED in the opto-isolator
0.009 A = Nominal LED current
2200 ohms = Internal resistor
For example:
To connect a 48 VDC signal voltage to an input on the I/O Sentinel 4 G2 in “wet”
configuration the completed equation for the external resistor value would be:
R = ((48-1.2)/0.009)-2200 = 3000 ohms
To calculate the power dissipated by the external resistor, the equation would be:
P = I x I x R, so the resistor must be at least .009 x .009 x 2200 = 0.243 Watts,
use a 1/2 Watt rated resistor.
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product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
OPERATION
Input Jumper Configuration
Each input is equipped with an internal four-position header and two jumpers. The
headers are labeled JPR1-4, JPR1 = IN1, JPR2 = IN2, etc. The factory default con-
figuration is for a DRY input (relay contact, switch, open collector) with a jumper
over pins 1 & 2 and another jumper over pins 3 & 4. To change the input to WET
(user supplied external voltage between 5 and 24 VDC, or 25-48 VDC with an added
resistor), remove both jumpers and place ONE jumper over pins 2 & 3.
Operation
The I/O Sentinel 4 G2 can be controlled from over the network from its HTML-
based web-browser interface, via SNMP, or via TCP commands. The slow blinking
front panel “PWR/Heartbeat” LED indicates valid power and proper operation. The
front panel Input and Output LEDs indicate channel status.
Reset to Defaults
Factory defaults may be restored by depressing the recessed front panel “Defaults”
push button for five seconds after waiting for the unit to power up. The PWR/HB
led will rapidly blink two to three times when loaded.
WEBSITE:
Visit our web site for
product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
OPERATION
Ethernet “Quick Start” Guide
CAUTION! If you are not familiar with Ethernet enabled equipment, it may
be useful to contact your IT department, network administrator or network
consultant for assistance. Assigning an IP address already in use by another
device may cause problems with your network!
Instructions for changing the IP address of the computer that will be used for the
configuration of this product are given here. Note that these instructions are specif-
ically for computers with the Windows 10 operating system but will also work with
Windows 7. For setup using other operating systems, refer to the appropriate OS
user’s manual.
Step 1: Open the control panel by clicking on the Start Menu, click on Settings, then
click on Network & Internet. Click on View network status and tasks under Network
and Internet.
CAUTION!
NEVER DOWNLOAD
FIRMWARE UPDATES
OR CHANGES TO
THE XPORT WEB-
SERVER UNLESS
INSTRUCTED TO DO
SO BY BROADCAST
TOOLS®. DOING SO
DELETES ALL SOFT-
WARE AND VOIDS
ALL WARRANTIES
FROM BROADCAST
TOOLS, INC.
WEBSITE:
Visit our web site for
product updates and
additional information.

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OPERATION
WEBSITE:
Visit our web site for
product updates and
additional information.
Step 2: Click on the sidebar labelled Change adapter settings. The Network
Connections windows will pop up, as shown below.
Step 3: Right click on the icon labeled Local Area Connection or Ethernet. A menu
will appear. Select the option at the bottom of the menu labeled Properties. The
Ethernet Properties window will appear.

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I/O Sentinel 4 G2 Installation and Operation Manual
OPERATION
Step 4: On the Local Area Connection Properties page, double click on Internet
Protocol (TCP/IPv4) to display properties.
Step 5: Before making any changes to the network settings, write down the current
settings (or screen capture the page and print) so that they can be restored once the
unit is configured. Next, select the radio button labeled “Use the following IP
address” and type in the IP address 192.168.1.60. Type in the subnet mask of
255.255.255.0. Leave the default gateway field blank. Click OK to apply the new
settings.
WEBSITE:
Visit our web site for
product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
OPERATION
WEBSITE:
Visit our web site for
product updates and
additional information.
Ethernet (NETWORK) port LED indicator functions
NOTE: We recommend the use of Chrome, Firefox, or Safari for as your
browser.
Opening the LOGIN Web Page
1. Connect the supplied GRAY colored XOVER cable between the PC’s Ethernet
port and the products “NET” network RJ45’s jack.
2. Connect the supplied power supply. Verify that the green PWR/Heartbeat LED
is blinking and the left “LINK” LED above the “NET” Network RJ-45 is illu-
minated
3. Open the product’s login page by typing the following URL into the browser:
http://192.168.1.55 The username and password is required to change any
parameter and the fields are case sensitive.
Factory “login” defaults: username: admin (lower case)
password: 1234
NOTE: You may view the password by checking the “Show Password” box.
4. Press the “Submit” button to login in. Once you are logged in, follow this
manual for setup and/or operational information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
Web Setup and Operation
“Login” Web Page
The Login screen displays the Username and Password entry points.
WEBSITE:
Visit our web site for
product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
WEBSITE:
Visit our web site for
product updates and
additional information.
After you have successfully logged in, the Monitor/Control page will be displayed.
Depending on your access level, you may or may not be able to control or modify
the product’s configuration.
“Monitor/Control” Web Page
The Monitor/Control page allows the monitoring and or control of the I/O Sentinel
4 G2. The following is an explanation of each item on this page:
The Site ID, Time and Date are always displayed.
Queued Logs: Displays the number of log events in the email queue.
Status: Displays the condition of the four status/logic inputs.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
Relays: Allows the user with admin or monitor/control access to control each
relay for its displayed function.
Action/State: Determines how each relay will function. The relays may be config-
ured for one of three states.
1 - ON and OFF operation.
2 - Pulse with user configured pulse length from 100 ms to 2000 ms in 100 ms steps.
3 - Reboot, with user configured pulse length from 0 to 30 minutes in 1 minute steps.
To select other pages (if authorized), make your selection under the left hand
Navigation column.
WEBSITE:
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product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
“User Setup” Web Page
NOTE: You may view a password by checking the “Show Password” box.
Eight Usernames and Passwords may be configured for one of three access levels:
1. “Admin” allows complete configuration access and control.
2. “Monitor/Control” allows the following access:
About, Monitor/Control, Show log, Help, and Logout.
3. “Monitor Only” allows the following access:
About, Monitor only, Help, and Logout.
Only users with “admin” access can make changes to this page.
The site ID is displayed and can be changed on the Email/Network Setup page.
NOTE: After any item has been changed, you MUST press the “Save
Settings” button for your changes to be saved.
WEBSITE:
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product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
“I/O Setup” “Inputs” Web Page
The I/O setup page allows you to label and configure the status inputs and relay out-
puts. Use the drop-down menu to select “Inputs” or “Outputs” and the “Input x” and
“Output x” drop-down menus to configure each input and output.
WEBSITE:
Visit our web site for
product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
“I/O Setup” “Inputs” Web Page (cont.)
Input selection drop-down: Allows for the selection of each status/logic input.
Input Status Message: Used to identify each status/logic input.
OFF Alarms: This box must be checked to enable alarms when the input
is OFF. The boxes labeled 1 thru 8 allow the user to
enable up to eight different email addresses.
ON Alarms: This box must be checked to enable alarms when the input
is ON. The boxes labeled 1 thru 8 allow the user to enable
up to eight different email addresses.
Normal Signal Level: This drop-down allows the selection of current logic
level. This normally set for “high”, but may be set to
“low” to invert the input.
NOTE: When the "Normalsignal level" is set toHigh = When NO voltage is
applied to the input,it is considered OFF, whenvoltageIS applied to the input,
it considered ON.
NOTE: When the "Normal signal level" is set to Low = When voltage IS
applied to the input, it is considered OFF. WhenNO voltage is applied to the
inputit considered ON.
NOTE: By enabling the ON and/or OFF monitoring and NOT enabling an
email box, the device will log the events, but not send an email. If the device is
exiting a OFF alarm condition, then the email addresses used will be those noti-
fied when the OFF alarm condition was entered.
Enable Extension: This box must be checked when paired with a second I/O
Sentinel® 4 G2 to form a “4 Channel Bi-directional
Status/Relay Extension Cord.” Normally disabled.
Log Device: This enables the email snapshot logging of the status
input.
Delay Time: The delay is in seconds. This option specifies the wait
time from when a status/logic input changes state before
an alarm is activated.
NOTE: Set to zero when paired with another I/O Sentinel® 4 G2.
Alarm LED Status: Allows the user to configure the color of the web LED
when in an alarm condition.
Scheduler: When enabled, the user may set each input alarm to be
disabled or enabled by configuring the required day(s) of
week and the start and end hours and minutes.
NOTE: Press the “Save Settings” button to save your changes.
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product updates and
additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
“I/O Setup” “Relays” Web Page
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additional information.

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I/O Sentinel 4 G2 Installation and Operation Manual
SETUP
“I/O Setup” “Relays” Web Page (cont.)
Selection drop-down: Allows the user to select the I/O setup configuration pages.
Relay label: Used to identify the device.
Alarms OFF: This option enables email alarms with an “OFF” relay.
Email Addresses: The “OFF” boxes labeled 1 thru 8 allow the user to enable up
to eight different email addresses for off alarms.
Alarms ON: This option enables email alarms with an “ON” relay.
Email Addresses: The “ON” boxes labeled 1 thru 8 allow the user to enable up
to eight different email addresses for on alarms.
Log Device: This enables the email snapshot logging of the relay status.
Scheduler: When enabled, the user may set each relay alarm to be dis-
abled or enabled by configuring the required day(s) of week
and the start and end hours and minutes.
Enable Extension: This box must be checked when paired with a second I/O
Sentinel® 4 G2 to form a “4 Channel Bi-directional
Status/Relay Extension Cord.” Normally disabled.
NOTE: Press the “Save Settings” button to save your changes. WEBSITE:
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