Omniflex Teleterm Silent Sentry C2330B User manual

USERMANUAL
Teleterm
Silent Sentry
Models C2330B
User’s Manual

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SCOPE
Products Covered by this Manual
This User Manual provides information on how to install, configure and use the Teleterm Silent
Sentry SMS Alarm Monitor.
This manual covers the following product Models:
Model
Description
C2330B
Teleterm Silent Sentry SMS Alarm Monitor
NOTE: This revision applies to Silent Sentry Software Version 3.02 upwards
Manual Revision History
Date
Revision
Comments
12 Feb 2009
6
Released for C2330B and C2331B from C2330A Rev 5
5 Apr 2009
7
Minor error in message layout corrected in sections 3.3.1
and 3.3.6
30 Sep 2010
8
Added embedded messaging and Periodic timers.
14 Nov 2012
9
Added recipient groups and 16 more recipients.
2 Mar 2018
10
Analog output no longer supported & removed C2331B
9 Nov 2018
11
Message Command for password incorrect and missing
page numbers
Software Copy Available
This manual is available in Adobe Acrobat pdf format.
The pdf file is named UMC2330BR11.pdf

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Table of Contents
Products Covered by this Manual.................................................................................................................2
Manual Revision History...............................................................................................................................2
Software Copy Available ..............................................................................................................................2
1. GENERAL DESCRIPTION.....................................................................................................................6
1.1 Overview.....................................................................................................................................6
1.2 Front Panel LED (Light Emitting Diode) Indicators.....................................................................7
1.3 Front Panel Pushbutton..............................................................................................................7
1.4 Serial Port 1................................................................................................................................7
1.5 I/O Terminals..............................................................................................................................8
1.6 Antenna Connection...................................................................................................................8
2. Installing the Teleterm Silent Sentry.......................................................................................................9
2.1 Connecting the Internal Clock Battery........................................................................................9
2.2 Inserting the Network SIM Card..................................................................................................9
2.3 Registering the Silent Sentry on the CDMA network (Model C233xB-13 only)..........................9
2.4 Mounting the Silent Sentry........................................................................................................10
2.5 Connecting Serial Port 1...........................................................................................................10
2.6 Connecting the Antenna...........................................................................................................11
2.7 Positioning the Antenna............................................................................................................11
2.8 Allocating direct Inputs and Outputs.........................................................................................11
2.9 Connecting Digital Inputs..........................................................................................................12
2.10 Connecting Digital Outputs.......................................................................................................13
2.11 Connecting Analogue Inputs.....................................................................................................14
2.12 Powering up the Silent Sentry ..................................................................................................15
3. Operation of the Silent Sentry..............................................................................................................16
3.1 Basic Function..........................................................................................................................16
3.2 Source of Message Triggers.....................................................................................................16
3.2.1 Digital Inputs................................................................................................................................16
3.2.2 Analogue Input Set points...........................................................................................................16
3.2.3 System Inputs..............................................................................................................................16
3.2.4 Derived Inputs.............................................................................................................................16
3.2.5 Periodic Timers ...........................................................................................................................16
3.3 Messages .................................................................................................................................16
3.3.1 Message Format .........................................................................................................................16
3.3.2 SMS Message Identifier..............................................................................................................16
3.3.3 Common Message Text..............................................................................................................17
3.3.4 Alarm Message Text ...................................................................................................................17
3.3.5 Date and Time Text.....................................................................................................................17
3.3.6 Example Message.......................................................................................................................17
3.4 Recipients.................................................................................................................................17
3.5 Recipient Groups......................................................................................................................17
3.6 Daily Update Message..............................................................................................................17

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3.6.1 Example Message.......................................................................................................................17
3.7 Recipient Priorities....................................................................................................................18
3.8 Timer Settings...........................................................................................................................18
3.8.1 Delay Time to Priority 2 Messages..............................................................................................18
3.8.2 Delay Time to Priority 3 Messages..............................................................................................18
3.8.3 Hold Off Time..............................................................................................................................18
3.8.4 Periodic Timer Setting.................................................................................................................18
3.9 Acknowledging Messages........................................................................................................19
3.10 SMS’s per Hour ........................................................................................................................19
3.11 Use of the Modbus Link............................................................................................................19
3.12 On Demand Messaging............................................................................................................19
3.13 On Demand Message Examples..............................................................................................20
3.14 Embedded Messages...............................................................................................................21
4. Configuring the Teleterm Silent Sentry ................................................................................................23
4.1 Overview...................................................................................................................................23
4.2 Incompatibility with Previous Versions of Omniset and DITview..............................................23
4.2.1 Versions of Omniset prior to 7.3..................................................................................................23
4.2.2 What if I have DITview installed?................................................................................................23
4.3 Installing Omniset from the CD supplied ..................................................................................23
4.4 Connecting Omniset to the Teleterm Silent Sentry for first time...............................................24
4.5 Overview of the Silent Sentry Configuration Template.............................................................25
4.6 Quick Configuration..................................................................................................................25
4.6.1 Set the Real-time Clock...............................................................................................................25
4.6.2 Set the I/O Points to Digital Input................................................................................................26
4.6.3 Set the SIM Card PIN and Telephone Number (Model C2330A/B only).....................................26
4.6.4 Configure the Messages in the Message List .............................................................................27
4.6.5 Set the Recipient List ..................................................................................................................28
4.6.6 Configure the Recipient Group....................................................................................................29
4.6.7 Send the test Message................................................................................................................29
4.7 Message Trigger Sources.........................................................................................................29
4.7.1 Digital Inputs/Outputs..................................................................................................................30
4.7.2 Analogue Alarm Points................................................................................................................30
4.7.3 Derived Inputs.............................................................................................................................30
4.7.4 Periodic Timers ...........................................................................................................................31
4.8 On Demand Messages.............................................................................................................31
4.9 Embedded Functions................................................................................................................32
4.10 Sending Messages between RTU’s..........................................................................................33
4.11 Configuring the Serial Port 1.....................................................................................................33
4.12 Other Configuration Settings ....................................................................................................33
5. Modbus and the Silent Sentry..............................................................................................................34
5.1 Overview...................................................................................................................................34
5.2 Modbus Slave...........................................................................................................................34
5.2.1 Selecting the Slave Protocol Details ...........................................................................................34

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5.2.2 Modbus Data Register Mapping..................................................................................................34
5.3 Modbus Master.........................................................................................................................35
5.3.1 Selecting the Master Protocol Details .........................................................................................35
5.3.2 Query Blocks...............................................................................................................................35
6. Maintenance.........................................................................................................................................37
6.1 Battery Type .............................................................................................................................37
6.2 Battery Replacement Procedure...............................................................................................37
7. Specifications.......................................................................................................................................38
8. Technical Support ................................................................................................................................41
Table of Figures
Figure 2.1: Mechanical Mounting Dimensions for the Silent Sentry...........................................................10
Figure 2.2 - Digital Input Connections ........................................................................................................12
Figure 2.3 - Digital Output Connections......................................................................................................13
Figure 2.4 - Analogue Input Connections...................................................................................................14
Table of Tables
Table 1.1 Front Panel LED Indicators...........................................................................................................7
Table 2.1: Pin allocation of serial port 1 connector on Silent Sentry. .........................................................11
Table 2.2 - I/O Point Configuration Options................................................................................................12

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1. GENERAL DESCRIPTION
1.1 Overview
The TELETERM ‘Silent Sentry’ is an SMS (Short Message Service or Text Message) Alarm Monitor
capable of monitoring a wide range of signals and sending SMS Alarm messages upon detection of
any alarm condition.
The Silent Sentry is equipped with 12 direct Binary and Analogue Inputs, plus a Modbus port
allowing alarms from a variety of sources to be monitored.
Up to 64 different SMS messages can be sent. The Silent Sentry can be configured for up to 32
message recipients, each in one of three escalating priority groups. This allows SMS messages to
be sent to a selected group of recipients, and if not acknowledged within a set time, then sent to the
second group of recipients, and if still not acknowledged, then sent to the third group of recipients.
All messages are sent to all recipients in the priority order set.
The addition of a daily update SMS message capability ensures that the Silent Sentry is always
available to react to alarms when they occur.
The Silent Sentry is easily configurable, using the free Omniset configuration software. Using
Omniset PRO, the Silent Sentry can also be configured remotely over the mobile phone network.
The “On-Demand” messaging feature allows an authorised user to send an SMS message to the
unit to read a value, change a setting, or write to an output.
The Silent Sentry can also be connected to your existing PLC’s, DCS, SCADA and alarm
annunciator systems using the Modbus serial port or optional Ethernet port to send SMS Alarms
from events within in your existing process.
Figure 1.1: Front View of the Teleterm Silent Sentry with Ethernet port
SD Pushbutton
Antenna Connector
Serial Port 1 Connector
Wiring Terminals
Cover Screws
Programming Port Connector
SD Card Slot
Optional Ethernet

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1.2 Front Panel LED (Light Emitting Diode) Indicators
Legend
Colour
Description
NET
Green
Signal Strength Indicator
ON STEADY –Network is connected and signal
strength is acceptable
OFF –There is no network connection.
TX1
Red
Serial Port 1 Transmit Activity
ON –The Silent Sentry is transmitting data out of the
Serial Port 1 (on the front of the unit).
RX1
Yellow
Serial Port 1 Receive Activity
ON –The Silent Sentry is receiving data coming in on
Serial Port 1 (on the front of the unit).
TX2
Red
Network Transmit Activity
ON –On when the Silent Sentry is communicating with
the internal network modem.
RX2
Yellow
Network Receive Activity
ON –On when the internal network modem is sending
information to the Silent Sentry.
OK
Green
Silent Sentry OK Indicator
ON –Silent Sentry is operating correctly
OFF –No Power or the Silent Sentry is faulty
RUN
Green
Silent Sentry is monitoring for alarms
ON –Silent Sentry is operating correctly
OFF –No Power or the Silent Sentry is faulty
SD
Green/Red
SD Card Indicator
GREEN –SD Card is inserted and ready.
RED –Silent Sentry is writing data to the SD Card.
OFF –The light is normally off in the absence of an SD
card.
Table 1.1 Front Panel LED Indicators
NOTE: On Power up, all indicators will light for a few seconds during initialisation. Thereafter, the
indicators will resume their normal operation as per the table above.
1.3 Front Panel Pushbutton
A Serial PORT 1 “SD” pushbutton is located on the bottom right corner of the front plate of the Silent
Sentry. This pushbutton is used when removing the SD memory card. Before removing the SD
memory card, push this button to tell the Silent Sentry to pause communication with the SD card, ad
to close all open files so the card can be ejected. Wait for the SD light to go off before ejecting the
SD memory card
1.4 Serial Port 1
The Teleterm Silent Sentry is equipped with a serial port, labelled PORT 1, on the front of the unit.
This serial port is used to communicate with other equipment.
This serial port can be wired for RS232, RS422 or RS485 communications.
The serial port can be configured for one of two protocol sets:
a) Modbus protocol (Master or Slave device, ASCII or RTU protocol) is available on this port
allowing easy connection to other third party products such as Alarm Annunciators, PLC’s DCS
or SCADA systems.
b) Conet/s protocol is available for integration into Conet networks with other Omniflex products.

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1.5 I/O Terminals
The Silent Sentry is equipped with 12 software configurable input/output points (IO points). Each IO
point can be individually configured as digital or analogue, input or output.
Up to 12 digital inputs, 12 analogue inputs, 10 digital outputs, and two analogue outputs can be
configured on the Silent Sentry (12 direct I/O points in total). See installation section for further
details.
1.6 Antenna Connection
The antenna connection allows an external antenna equipped with an SMA male plug connector to
be used with this device.
A 0dB antenna is supplied with the Teleterm Silent Sentry. This antenna is provides satisfactory
reception for the majority of applications. For difficult reception areas, a high gain antenna may be
purchased from Omniflex.

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2. Installing the Teleterm Silent Sentry
2.1 Connecting the Internal Clock Battery
Before installing the Silent Sentry, the internal clock battery must be connected.
The Silent Sentry is shipped from the factory with a “Battery Protector Tab” protruding from the left
side of the unit. Pull on the tab to remove before use.
See section 6 for battery replacement details.
2.2 Inserting the Network SIM Card
The GSM aligned models of the Teleterm Silent Sentry require a SIM card (not supplied) to enable
the Silent Sentry to operate on the selected mobile phone network.
To insert the SIM card:
1. Remove the top cover of the Silent Sentry by undoing the two hex screws holding the top cover
of the unit, using a 2.5mm hex key (supplied).
2. Insert the SIM card into the SIM card holder you will see in the centre of the unit. Take special
care that the SIM card is correctly seated in the connector, and that the SIM card holder is
properly closed. Press firmly down and slide forward to close securely.
3. Replace the top cover.
2.3 Registering the Silent Sentry on the CDMA network (Model C233xB-13 only)
The Teleterm Silent Sentry equipped with CDMA network connection must be registered on the
customer selected CDMA network before the unit can operate.
The Teleterm Silent Sentry for CDMA networks is supplied with an Electronic Serial Number (ESN).
This number can be found on a label attached to the unit.

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This ESN must be supplied to the CDMA network operator when registering the unit for operation on
the CDMA network.
2.4 Mounting the Silent Sentry
The Teleterm Silent Sentry is designed to be clipped to one of the following mounting rails:
Top Hat Section (DIN) Rail 35/7.5mm in accordance with EN 60715: 1981
Top Hat Section (DIN) Rail 35/15mm in accordance with EN 60715: 1981
G Section Rail 32mm in accordance with EN 60715: 1981
45
89,5
54,5
46,5
155
109,5
Height including serial cable
5
7,5
Figure 2.1: Mechanical Mounting Dimensions for the Silent Sentry
2.5 Connecting Serial Port 1
Rhe selection of either RS232 or RS422/RS485 is achieved by specific wiring of the serial port
connector. No internal links need be changed to select between RS232 and RS422/485.

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1
3
4
5
6
7
8
9
2
Pin
number
Communication Standard
RS232
RS485
1
Do not connect
Rx Data + (In)
2
Rx Data (In)
Rx Data –(In)
3
Tx Data (Out)
Do not connect
4
Do not connect
Tx Data+ (Out)
5
Ground
Ground
6
Do not connect
Vcc
7
RTS (Out)
Do not connect
8
CTS (In)
Do not connect
9
Do not connect
Tx Data –(Out)
Table 2.1: Pin allocation of serial port 1 connector on Silent Sentry.
NOTE: The RTS and CTS handshaking lines are available for applications that require them. It is
not a requirement of the CPU to use handshaking. In most applications connecting the RTS and
CTS handshaking lines is not necessary.
2.6 Connecting the Antenna
The supplied Antenna’s should be screwed directly into the Antenna socket. Do not over tighten.
This connector should be only finger tight to avoid damage. This connector is an SMA Jack, and will
accept any antenna connection with an SMA plug.
2.7 Positioning the Antenna
When using a remote antenna, the antenna should be placed away from the Silent Sentry in a
position that gives the best possibility of a good signal on the mobile phone network. Avoid proximity
of the antenna to shielding materials such as metal enclosures.
The signal strength of the chosen location can be easily checked by holding a mobile phone
(connected to the same network) in the intended position of the antenna, and checking that the
signal strength on the phone is good.
CAUTION: The antenna emits RF energy on a continuous basis, and should be positioned away
from sensitive instrumentation, and away from areas where close proximity to personnel on a
regular basis would occur.
2.8 Allocating direct Inputs and Outputs
The Silent Sentry has a unique feature of allowing each I/O point to be software configured as
analogue or digital, input or output, for the best possible utilisation of I/O in any application.

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The following table gives the possible options for each I/O Point:
I/O
Point
Terminal
No.
Digital
Input
Analogue
Input
Digital
Output
1
5
Yes
0-30Vdc
Yes
2
6
Yes
0-30Vdc
Yes
3
7
Yes
0-30Vdc
Yes
4
8
Yes
0-30Vdc
Yes
5
9
Yes
0-30Vdc
Yes
6
10
Yes
0-30Vdc
Yes
7
11
Yes
0-5Vdc
Yes
8
12
Yes
0-5Vdc
Yes
9
13
Yes
0-5Vdc
Yes
10
14
Yes
0-5Vdc
Yes
11
15
Yes
0-30Vdc
-
12
16
Yes
0-30Vdc
-
Table 2.2 - I/O Point Configuration Options
Review your I/O requirements, and then make the optimum allocation of the I/O, taking into account
the variations in specification of each I/O Point.
2.9 Connecting Digital Inputs
Digital Inputs must be connected in accordance with the following schematic:
1
2
3
4
n
+V
0V
+-
9-30Vdc
Supply
IOP 1 - IOP 12
Figure 2.2 - Digital Input Connections

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Digital Input Specifications:
Parameter
Condition
Value
LED Indication
Input On
Green LED On
Absolute Maximum Input Voltage
30Vdc
Minimum High Level Input
Voltage
3Vdc
Maximum Low Level Input
Voltage
2Vdc
Input Current
Vin = 5V
0.7mA (typical)
Input Current
Vin = 10V
1.7mA (typical)
Input Current
Vin = 12V
2.2mA (typical)
Input Current
Vin = 24V
4.7mA (typical)
Input Current
Vin = 30V
6.0mA (typical)
2.10 Connecting Digital Outputs
Digital Outputs must be connected in accordance with the following schematic:
1
2
3
4
n
+V
0V
+-
9-30Vdc
Supply
IOP 1 - IOP 10
+
-+V
Figure 2.3 - Digital Output Connections
Digital Output Specifications:
Parameter
Condition
Value
LED Indication
Output On
Green LED On
Maximum Continuous Output Current
50mA
Maximum Peak Output Current
10ms max
200mA
Minimum High Level Output Voltage
+VPSU –2.5V

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2.11 Connecting Analogue Inputs
Analogue Inputs must be connected in accordance with the following schematic:
1
2
3
4
n
+V
0V
+-
9-30Vdc
Supply
IOP 1 - IOP 12
+
-
0-5/30V
Figure 2.4 - Analogue Input Connections
Analogue Input Specifications:
I/O Points 1-6, 11 and 12
Parameter
Value
LED Indication
None
Absolute Maximum Input Voltage
30Vdc
Input Impedance Minimum
1MΩ
Minimum Measurable Input
Voltage
0V
Maximum measurable Input
Voltage
30V
Resolution
33mV (10 bits)
Accuracy
0.1% of reading + 1 bit
I/O Points 7 to 10
Parameter
Value
LED Indication
None
Absolute Maximum Input Voltage
30Vdc
Input Impedance Minimum
280kΩ
Minimum Measurable Input
Voltage
0V
Maximum measurable Input
Voltage
5.5V
Resolution
6mV (10 bits)
Accuracy
0.1% of reading + 1
bit

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2.12 Powering up the Silent Sentry
Upon power up, the Silent Sentry will take approximately 90 seconds to initialise the system and
connect to the wireless network. During this time, no SMS messages will be sent.
Once initialisation is complete, the green Network Indicator (NET) will light to indicate that the Silent
Sentry is successfully connected to the network, and the Silent Sentry will begin to monitor for
alarms.

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3. Operation of the Silent Sentry
3.1 Basic Function
The Silent Sentry scans a set of binary conditions within the Silent Sentry at least every 100ms, and
sends an SMS message whenever the relevant condition changes.
A binary condition is a condition that can be in one of two states –either 0 (Off) or 1 (On).
These changes to the binary conditions are known as “message triggers”. Each SMS message can
set to be triggered by the source binary condition changing from either 0 to 1, or from 1 to 0.
3.2 Source of Message Triggers
The following is a list of conditions that can be selected to trigger each message:
3.2.1 Digital Inputs
These are on/off inputs wired directly to the terminals of the Silent Sentry
3.2.2 Analogue Input Set points
The Silent Sentry can have up to 12 direct analogue inputs. Each direct analogue input has
four internal alarm set points associated with it. This allows the analogue input to be monitored
for up to four alarm settings, and a message sent if the analogue value rises above or falls
below each set point.
3.2.3 System Inputs
The Silent Sentry also monitors a number of internal conditions that can be used to send SMS
Alarm messages. These include Real Time Clock Battery status and I/O Point failures.
3.2.4 Derived Inputs
The Silent Sentry allows you to configure up to 32 Derived Inputs. A Derived Input is not a
physical input, but an input based upon the value of a single Bit of information in one of the
Silent Sentry’s internal 16 bit Data Registers. Derived Inputs are used when monitoring data
via the Modbus link. In this case the Modbus link writes the data to be monitored to a Data
Register in the Silent Sentry, and then a Derived Input is configured to monitor that data bit.
3.2.5 Periodic Timers
The Silent Sentry allows you to configure up to 4 Periodic Timer triggers. Any message that is
triggered by one of these 4 Periodic Timers will be continuously sent at the configured period.
3.3 Messages
Up to 64 SMS messages can be sent to up to 32 recipients on a time priority basis.
3.3.1 Message Format
The format of all alarm messages sent is as follows:
Line 1: Identifier and Common Message Text
Line 2: Specific Message Text
Line 3: The time since triggering of the message if the message is priority 2 or 3.
Line 4: Date and Time
3.3.2 SMS Message Identifier
The Silent Sentry gives each SMS message a unique ID number. This ID number is sent as
the first characters of the first line of each message (before the Common Text message) to
uniquely identify the message. When the ID reaches 999 it goes back to 1.

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3.3.3 Common Message Text
This text of up to 40 characters is sent at the beginning of every message (after the message
ID). This is typically used to identify the location of the Silent Sentry or source of the
messages.
3.3.4 Alarm Message Text
This text of up to 40 characters is unique to each of the 64 messages.
3.3.5 Date and Time Text
The date and time sent in the fourth line of the message is the date and time that the message
was sent as read from the internal real time clock in the Silent Sentry.
This clock should to be checked for accuracy from time to time. The real time clock can be
adjusted using Omniset. (See 4.6.1 Setting the Real Time Clock).
3.3.6 Example Message
This is a typical alarm message:
341Pump Station P304 2
Sump Level High 3
30 minutes ago 4
2005/07/04 10:31:16 5
Notes:
1. This up to three digit number is the unique message ID.
2. The balance of this line is the Common Message Text
3. This is the Individual Alarm Message Text
4. This line is only sent when the message has been delayed by the Priority setting.
5. The date and time is derived from the internal Real Time Clock in the Silent Sentry.
3.4 Recipients
A recipient is the mobile phone number to which you wish to send the SMS messages
Up to 32 recipients can be configured in the Silent Sentry.
All configured recipients receive all messages pertaining to the recipient group.
IMPORTANT: Recipient telephone numbers must be entered without any spaces or dashes or other
separating characters. The only allowable non-numeric character is a + sign at the front of the
number if the country code is included.
3.5 Recipient Groups
Messages are sent to the recipients that belong to a particular group. Up to 16 Recipient Groups
can be configured. Each group can have a maximum of 32 recipients.
3.6 Daily Update Message
A daily message can be configured that will be sent once a day at the specified time. This message
is used to confirm that the Silent Sentry is still operating normally, even when no alarms are
occurring.
The recipients to whom this daily update message is sent can be individually selected.
This message has the following format:
Line 1: 123 Common Message Text
Line 2: Daily Update Message Text
Line 3: Date and Time
3.6.1 Example Message
This is a typical daily update message:
1231Pump Station P304 2
I’m Alive 3

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2005/07/04 10:31:16 4
Notes:
1. This three digit number is the unique message ID.
2. The balance of this line is the Common Message Text
3. This is the Daily Update Message Text
4. The date and time is derived from the internal Real Time Clock in the Silent Sentry.
3.7 Recipient Priorities
Each message recipient in the Silent Sentry can be placed in one of three escalating Priority
Groups.
When a message is triggered, the Silent Sentry first sends the SMS message to the Priority 1
Recipients.
If not acknowledged within a set time (called the “Time Delay to Priority 2 Messages”), then the
same message is sent to the Priority 2 recipients.
If still not acknowledged within a set time (called the “Time Delay to Priority 3 Messages”), then the
same SMS message is sent to the Priority 3 recipients.
The time delays to escalate the message to the next priority are common for all messages.
CAUTION: Even if no recipients are programmed for a given priority, the Silent Sentry will still wait
for the priority time-out before returning to wait for a trigger input. Therefore it is recommended that
the priority delay time be set to a minimum for unused priorities.
3.8 Timer Settings
There are three timers used in the Silent Sentry as explained below. Each timer has a resolution of
minutes.
3.8.1 Delay Time to Priority 2 Messages
This is the time that the Silent Sentry will wait after sending the message to all Priority 1
recipients before sending the same message to Priority 2 recipients. If an Acknowledgment
reply is received before this time has elapsed, then no further message is sent, and the Silent
Sentry returns to wait for a message trigger (see Hold Off Timer).
3.8.2 Delay Time to Priority 3 Messages
This is the time that the Silent Sentry will wait after sending the message a second time to all
Priority 2 recipients before sending the same message to Priority 3 recipients. If an
Acknowledgment reply is received before this time has elapsed, then no further message is
sent, and the Silent Sentry returns to wait for a message trigger (see Hold Off Timer).
3.8.3 Hold Off Time
Once an Alarm has been acknowledged, a hold off time can be set to prevent this message
from being sent again for the specified “hold off” time. This is used to prevent an unstable
process condition from sending an excessive number of SMS messages in quick succession.
TIP: Because the timers are decremented every minute on the minute, the actual time delay of each
timer will be accurate to 1 minute. Thus, if a timer is set to 2 minutes, then the actual time delay
could be between 1 and 2 minutes depending upon when the event occurred in relation to the
minutes time base. Timers set to 1 minute may therefore timeout almost instantly, and should
therefore be avoided.
3.8.4 Periodic Timer Setting
Four periodic Timers can be configured (in minutes) to send messages periodically. The
period can be set from 1 to 6553 minutes.

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3.9 Acknowledging Messages
Messages are acknowledged by sending an SMS to the Silent Sentry with one of the following text
strings in the message:
Ack
Yes
This acknowledgement message is most easily sent by replying to the message received with one
of the specified text strings. The reply can use lower or upper case letters.
3.10 SMS’s per Hour
An added protection is provided to limit the number of SMS’s that can be sent in any hour. This is
used to prevent an unstable process condition from sending multiple SMS messages on a
continuous basis, causing an excessive bill for SMS messages.
Set this limit to the maximum number of SMS’s that you expect to be sent in any hour (i.e. from
xxh00 to xxh59). This count is reset every hour on the hour.
3.11 Use of the Modbus Link
The binary conditions that trigger SMS messages can be based upon data received over the
Modbus link (either serial or Ethernet). This allows the Silent Sentry to be used to monitor any
instrument that has a Modbus port (Master or Slave) available, and to trigger SMS messages based
upon the conditions within the instrument.
This is achieved in three steps:
1. Configure the Silent Sentry to read the data from the instrument over the Modbus link, and
place the data in the set of “scratch pad” registers allocated for the purpose in the Silent
Sentry.
2. Configure derived inputs to monitor any of the bits in the scratch pad registers.
3. Configure SMS messages to be triggered by the derived inputs.
3.12 On Demand Messaging
The Silent Sentry is also capable of interpreting SMS messages sent to it that act as commands.
Several commands can be sent in a single message, each command separated by the ‘;’ character
that ends the command text. Each message must begin with the password command; if an
incorrect or no password is supplied, all commands will be ignored and the return message “Denied”
will be sent. Incorrectly formed commands are ignored.
The commands are as follows:
Command
Description
Response
+<pwd>;
Password string, where <pwd> is a 4
character password that must match
that stored in the unit.
Passwords are NOT case sensitive.
None or ‘Denied’, depending upon
the accuracy of the password
supplied
?;
Enable confirmation SMS for all further
write commands in the message
See the individual write commands
below for response details
Xn;
Read digital input n, where n is the
input number from 1 to 12
“Xn=0;”for Digital Input n OFF
“Xn=1;”for Digital Input n ON
Yn;
Read digital output n, where n is the
output number from 1 to 10
“Yn=0;”for Digital Output n OFF
“Yn=1;”for Digital Output n ON
An;
Read analogue input, n where n is the
input number from 1 to 12
“An=z;”where z is scaled engineering
value for the input

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-© Omniflex
Command
Description
Response
Bn;
Read analogue output, n where n is
the output number from 11 to 12
“Bn=z”; where z is scaled engineering
value for the output
Cn;
Read counter input, n where n is the
counter input number from 1 to 12
“Cn=z;”where z is counter reading
Dn;
Read Data Register, n where n is the
data register number in the Data
Interchange Table (DIT) from 0 to
8999.
“Dn=z;”where z is data register
contents expressed as an unsigned
16 bit number in the range 0-65535.
Dn.m;
Read Bit m of Data Register n, where
m is in the range 0 (LSB) to 15 (MSB)
n is the data register number in the
DIT from 0 to 8999.
“Dn.m=0;” if the bit is clear
“Dn.m=1;” if the bit is set
Yn=b;
Write the value b to digital output n
where
b=0 to turn the output OFF
b=1 to turn the output ON
n is the range 1 to 10.
After the command “?;”
“Yn=b;” where b is the value read
back from the output after the write
was executed.
Bn=z;
Write the value z to analogue output n,
where z is in engineering units, and n
from 11 to 12.
After the command “?;”
“Bn=z;” where z is the value read
back from the output after the write
was executed.
Cn=z
Write the value z to the counter input
n, where
z is in the range 0 to 4294967296.
N is the input number from 1 to 12.
After the command “?;”
“Cn=z;” where z is the value read
back from the counter after the write
was executed.
Dn=z
Write the value z to the data register n
where
z is a number from 0 to 65535.
n is the data register number in the
DIT from 0 to 8999.
After the command “?;”
“Dn=z;” where z is the value read
back from the data register after the
write was executed.
Dn.m=b
Write the value b to bit m in data
register n, where
b=0 to clear the bit
b=1 to set the bit
m is in the range 0 (LSB) to 15 (MSB)
n is the data register number in the
DIT from 0 to 8999.
After the command “?;”
“Dn.m=b;” where b is the bit value
read back from the data register after
the write was executed.
3.13 On Demand Message Examples
If the password of a unit is set to “ABCD” then sample commands and responses are:
Command
Response
Y1=1;
None.
(Only messages that start with “+” will be
responded to.)
+FGHJ;Y1=1;
Denied.