CEP STD35 User manual

STD35
User Manual
Revision 0.9

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Important information
This technical description contains important information for start up and use of the STD35.
Read it carefully before you start working with the STD35.
The warranty will be void should damage occur due to non-compliance with these instructions
for use. We cannot accept any responsibility for consequential loss.
We cannot be held responsible for material loss or personal injury that is due to incompetent
use or non-compliance with the safety instructions. The warranty will be void in such
circumstances.
The STD35 contains highly integrated components which can be damaged by electrostatic
discharge if the user would open the housing.
CEP preserves the right to change the included information without notice and doesn’t take
responsibility for errors in the document and/or missing information.
Therefore only touch the STD35 on the housing or connectors and avoid touching
the components on the board.
Safety Instructions
When using products which are exposed to electric voltage the valid VDE-regulations
have to be observed. Especially VDE 0100, VDE 0550/0551, VDE 0700, VDE 0711
and VDE 0860 are applicable.
All wiring work has to be done in a voltage free state only
All cables and wires which are energized and connected to the device, the module, or
components have to be checked regularly for any damage to the isolation shielding or
fractures in the cables. If the supply cables are visibly damaged the device has to be taken
out of operation immediately until the faulty cable has been exchanged
Before putting a device into operation, it has to be clarified, whether this device or module
is appropriate for the field of application. In case of doubt ask a specialists or the
manufacturer of the device.
Please note that we are not responsible for any errors in usage or connection. Therefore we
cannot accept any responsibility for consequential loss.
Before opening the device always disconnect the mains adapter or make sure that the
device is disconnected from the power supply.
Components, modules or devices have to be built into a housing before they are put into
operation. During installation they should not be connected to any power supply .
You should only use tools on components, modules, or devices if they are disconnected
from the power supply, and residual electric charge (which may still be stored in some
components inside the device) has been discharged.

When using components or modules it is necessary to strictly observe the specification
given in the corresponding description of these components.
If a description for a private end-customer does not clearly state which electric data is valid
for a component or a module, how to wire the device, which external components, or
additional devices can be connected or which parameters these components are allowed to
have, a specialist must be contacted.
Devices which operate with greater than 35 Volts have to be connected by a specialist.
Before putting the device into operation it should be checked that there is no current
leakage on the housing.
In case that measurements with the opened housing are necessary, an isolating-
transformer has to be integrated for safety reasons. Alternatively the voltage can be
supplied by an appropriate power supply which complies with the safety regulations. All
wiring work has to be done in a voltage free state only.

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Table of Contents
Important information......................................................................................................................... 2
Safety Instructions.............................................................................................................................. 2
1Introduction................................................................................................................................. 5
2Background Information ............................................................................................................... 6
2.1 GSM-Network in general......................................................................................................... 6
2.2GPRS.................................................................................................................................... 6
2.3 Quadband Frequencies........................................................................................................... 6
2.4 E-Mail via SMTP..................................................................................................................... 6
3Operating Conditions .................................................................................................................... 7
4Proper Use .................................................................................................................................. 8
5Introduction................................................................................................................................. 8
6Quick start up ............................................................................................................................ 11
6.1 General preparations............................................................................................................ 11
6.2 Hardware preparations......................................................................................................... 11
6.3 Configuration Call ................................................................................................................ 12
6.4 Quick configuration check..................................................................................................... 13
7SMS Commands ......................................................................................................................... 13
7.1 Table of SMS Commands...................................................................................................... 14
7.2 Variable substitution ............................................................................................................ 19
7.3 Send SMS Commands .......................................................................................................... 20
7.4 Explanation of the commands............................................................................................... 21
7.5 Examples for SMS Commands............................................................................................... 22
8E-Mail functionality via GPRS....................................................................................................... 23
8.1 Configuration of the E-Mail functionality................................................................................. 23
9Connecting the camera............................................................................................................... 24
10 Configuration Tool .................................................................................................................. 25
11 Troubleshooting...................................................................................................................... 26
12 Writing examples .................................................................................................................... 27
13 Accessories ............................................................................................................................ 30
14 Technical data ........................................................................................................................ 31
15 Document history.................................................................................................................... 32

1 Introduction
Thank you very much for purchasing our CEP STD35 telemetry device!
The STD35 offers the user the possibility to remotely switch ON or OFF electronic devices and
to receive alarm messages via (SMS). You can switch devices either with an SMS or using a
simple voice call. Alarm messages (SMS) can be received with any mobile phone supporting
SMS functionality.
With the new generation of the STD35 you now also have the possibility to receive alarm
messages via e-mail.
With the help of the digital camera which is available as an accessory, pictures can be taken
and sent via e-mail triggered by an alarm.
We wish you success and joy in using your new STD32!
Concerning the user manual
This document is meant to help you use the various functions of the device in the most optimal
way. Therefore we ask you to please read this manual carefully.
If you are in a hurry and want to make yourself familiar with the details of the product later,
then please read chapter 6 “Quick Start-up” first.
There you will find all necessary information to put the device into operation.
The information in this document has been gathered after thorough inspection but they are not
being taken as assurance of end product properties.
The written approval of CEP AG is mandatory before you can pass on or reproduce this
documentation for this product or the software or use the content.
CEP reserves the right to change the data mentioned here without prior notice and does not
take any responsibility for technical inaccuracies and/or omissions. This manual has been
thoroughly checked; should you nevertheless find an error or want to express criticism or make
suggestions, please send an e-mail to
E-Mail: [e-mail]
Oberhaching, 9th Dec 2013
© 2013 CEP AG, Oberhaching, Germany
This is an example of text for the main body. Style name: Text –Standard

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2 Background Information
2.1 GSM-Network in general
The GSM Network (Global System for Mobile Communications) is a standard for all-digital
mobile phone networks. GSM has been created to provide a mobile telephone system offering
the users Europe wide mobility and voice services compatible with ISDN or analog services.
Originally GSM has been designed for voice calls, the transmission of text messages (SMS) and
the transmission of data with a constant data speed. With the success of the internet an
evolution of GSM startet. The GSM network was expanded to offer packet oriented data
transmission (e.g. via GPRS) while keeping all other features and being fully downwards
compatible.
2.2 GPRS
GPRS (General Packet Radio Service) is a packet oriented transmission service which is used in
the mobile networks and which is supported by almost all network providers.
With GPRS you only have a virtually existing permanent connection to the other party. Only
when you really transmit data will the channel will be used, otherwise it is free for other users.
This means that no channel will be reserved permanently for a user (as it is with a GSM voice
call). Therefore the GPRS-bills depend more on the actual data volume transmitted than on the
connect time.
If the device is booked into the GPRS-Net it will automatically be assigned an IP-Address and
can exchange data with any server accessible via the internet,
Before you can use the GPRS-Interface the SIM-Card must be activated for GPRS. To order this
functionality please talk to your mobile network provider.
2.3 Quadband Frequencies
When a device is “quadband” it means that it uses the four major GSM frequencies and that it
is compatible with most GSM networks worldwide.
These four frequencies are 850 MHz and 1900 MHz (on the American continent) and 900 MHz
and 1800 MHz, which are used in almost all other countries worldwide (Europe and Asia).
In contrast to a triband mobile phone which only supports 900/1800 and 1900 or 850/1800
and 1900 a quadband device can be used in almost every GSM network worldwide.
2.4 E-Mail via SMTP
SMTP (Simple Mail Transfer Protocol) is a method used to send e-mails over the internet. The
handling will be done by a mail programme, which is running in this case on the STD35 and
which supports SMTP. For the user this process is invisible. This programme establishes a
connection to a SMTP server which will transport the e-mail to the given e-mail address with
the help of further SMTP servers if necessary.

To be able to use this service you must have an e-mail account with a mail provider (e.g. AOL
or Yahoo) and the following settings have to be made which are different for every mail
provider
Name of the SMTP Server (e.g. smtp.mailprovider.com or 192.168.234.12)
User name to register to the SMTP Server
Password to register to the SMTP Server
The device comes pre configured to use the free CEP email server. If the user
wishes to use there own email service it is important to note it must support plain
text authentification and Emails with no SSL-Encyption
To see which settings have to be used on the STD35 to be able to take advantage of this
service please read chapter 8.
3 Operating Conditions
Operate the STD35 only with a supply voltage between 7-32V DC and have in mind the
polarity! (see picture1) Use a stabilized power supply with minimum 1A output current. (We
recommend using only the original CEP power supply). If you use a mains adapter for power
supply it has to conform to the VDE regulations.
Loads connected to the device are not allowed to exceed 30 W per relay.
The maximum output voltage is 30 V AC/DC
The maximum switching power per relay is 1 A
When installing the device make sure that the supply cable has a sufficient diameter
During operation the temperature has to be between -30° and 75° Celsius.
Protect the PCB of the device from humidity, spray water and heat.
In case of condensation allow a period of about 2 hours for acclimatisation.
Do not operate the device in areas where inflammable gas, vapours, or dust are or could be
present.
Do not expose the device to heavy vibrations.
The unit may only be repaired by a specialist.
Only original parts have to be used when repairing the unit. The use of differing spare parts
can cause serious material loss or personal injury.
No special operation position of the device has to be observed.

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4 Proper Use
The device is designed for the remote switching of devices via the GSM network as well as the
remote retrieval of status information of the inputs and the generation of SMS messages or e-
mails after status has changed at the inputs. A different utilization of the device other than the
one described above is not allowed.
5 Introduction
The STD35 is a telemetry module which is easy to install and simple to use. It can be
configured using any GSM mobile phone, SMS capable software, or the CEP STD35
configuration tool (sold separately).
With the STD35 you can control five relays and monitor the status of three digital and two
analog inputs with one or several common mobile phones.
Apart from the STD35 you only need a valid SIM Card of any network provider (GSM850 / 900
/ 1800 or 1900 MHz)
While using prepaid SIM-cards one shall always keep aware of the amount of remaining credit
left on the card, so that in case of alarms a message can be sent.
Typical fields of application are:
the opening of (garage) doors
switching on and off light and alarm devices as well as generating alarm messages (SMS or
e-mail)
the retrieval of information from door sensors, movement sensors or level sensors
etc.
You can for example open your garage door with a call or get a message (via SMS or e-mail) in
case your house alarm system gets triggered. In connection with the CEP camera you can get
a photo via e-mail when a movement sensor connected to the STD35 detects movement.

Connectors
As described in figure 1 the STD 35 has 3 Green Screw terminals. One connector is for the 5
inputs (3 digital and 2 analog/digital). Another connector is for the 5 outputs which are all
driven by relays. And the third screw terminal connector is for the power supply.
On the right side of the diagram an additional accessory interface connector is shown. This
connector is for use with the optional CMOS camera or the CEP Configuration tool.
ANT: connect the GSM antenna with FME-female connector here.
Please observe the maximum output voltage of the relays and the maximum input voltage of
the inputs! In chapter 3 “Operating conditions” you will find further information on this.

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LED Signals
The STD35 has several LEDs which can be used to determine the current state of the device.
There are two power LEDs. A red power led that is illuminated when charging is taking place,
when not charging (battery full, or no charger is connected) it is off. A green power led saying
that is illuminated whenever the device is on. Normally this led reflects the state of the power
switch.
There is also a Yellow “COM” led it gives information regarding the current GSM status:
- stable in indicates the device is not currently booked into the GSM network
- blinking once every 2 seconds indicates the device is booked into the GSM network as
normal.
There are also separate red and green status LEDs. Under normal operating conditions these
two LEDs are not illuminated. However status red and status green can toggle if there is no
configuration yet (when in factory default state).
The status LEDs and GSM led (COM) will blink twice if no simcard (or an invalid simcard) has
been inserted. The status LEDs and GSM led (COM) will blink three times if the SIM PIN is
different than "0000" or "2468".
Switch:
There is also a small power switch between the power connector and the LEDs. This switch is
used to tum the device on and off.

6 Quick start up
In the following section it is described step by step what you have to do to begin using the
STD35 without extensive setup.
6.1 General preparations
You need an activated SIM card of a GSM network provider. The PIN of this card has to be set
to “0000” (4 times zero).
Alternatively you could use the PIN “2468”. To change the PIN you can use a common mobile
phone. The instructions how to change the PIN are described in the manual of your mobile
phone.
If you use a SIM card with a PIN different from “0000” or “2468” in the STD35, the
STD35 will use a “wrong” PIN. After the second attempt to power up the device
your SIM card will be blocked. In this case you need to use the “Super-PIN” or
“PUK” to assign a new PIN to your card. Please look into the user guide of your
mobile phone. There you find how to use the PUK to de-block the SIM card.
Should you wish to use a SIM card which does not require a PIN, this is also possible and the
STD35 recognizes this and will behave accordingly.
In the following we will refer to the “master mobile” as the mobile telephone which you want
to use to switch the outputs and to configure the STD35 via calls.
To be able to administer the STD35 with your master mobile it is necessary that the “incognito”
or “private call” function of the mobile is deactivated. This means the master mobile has to
transmit the mobile telephone number with every call. To change the settings please refer to
the user guide of your mobile telephone.
To test the setting you can call a different mobile phone; there your phone number or name
should be displayed.
6.2 Hardware preparations
Before connecting the supply voltage and switching on the STD35 please insert the SIM card
into the SIM card holder on the PCB of the STD35: To open the SIM card holder move it
sideways and flip it open; insert the card (mind the proper orientation of the card) and close it
again. To lock it in place move the top sideways in the opposite direction.
Now please connect the GSM antenna which is part of the delivery to the proper antenna
connector on the STD35 board.
After that connect the power supply and switch the device on.
Please always observe the polarity (see picture 1) and that you have a proper power supply.

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6.3 Configuration Call
After having connected the power supply and turning the device on the green power LED will
be illuminate (system start). Shortly after that the GSM LED will be activated. Now the STD35
will automatically try to connect to the GSM network. As soon as this is done, the GSM LED will
be flashing once every 2 seconds.
As soon as the red and green system LED are toggling the STD35 is ready and waiting for the
configuration.
Now call with master mobile the phone number of the SIM card which is inside the STD35. The
STD35 will accept the call and cancel it a few seconds later. During this call, a four digit DTMF
sequence is sent to the caller and you will hear them on your mobile phone.
With this call the STD35 is configured to the master mobile.
NOTE: when calling with the master phone it is necessary caller ID is not blocked, or
configuration call will not work correctly!
Pay attention:
As long as the STD35 still has the factory defaults it shows this by the toggling the red and
green system LEDs. From this moment on you have three minutes to configure the STD35 with
the configuration call.
After 3 minutes (without configuration call done in between) the device switches off. If you
switch it on again afterwards the STD35 is again expecting the configuration.
In case the STD35 will be disconnected from the power supply for longer than 120 seconds
(e.g. by a power failure) after a successful configuration it will automatically send a SMS/E-mail
with the text “START-UP ALARM” to the preconfigured telephone number as soon as the power
supply is established again.

6.4 Quick configuration check
To check whether the configuration was successful you can now make the following quick
configuration check.
Take your master mobile and call the telephone number of the SIM-Card inside the STD35.
This call should be cancelled by the STD35 and the Relay 1 should switch for one second.
Now the basic configuration is done which means that all future events will be sent to the
master mobile and that Relay 1 can be switched from that mobile phone.
To use the additional functions of the STD35 please continue reading chapter 7 “SMS
commands”
7 SMS Commands
In order to configure the device, request information from it, or trigger certain actions special
commands are used. All the commands are designed to be easy to enter even when using a
standard phone to send them via SMS. This chapter of the manual describes all the commands
the device will understand and how to use them.
With the optional CEP configuration tool available for the STD35, you can make all the settings
below from the comfort of your PC.

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7.1 Table of SMS Commands
Configuration Commands
R:
reset default device settings
ST?
request device status SMS
S:
1 - enable startup SMS
0 - disable startup SMS
C2:
set phone number nr 2
C3:
set phone number nr 3
C4:
set phone number nr 4
C5:
set phone number nr 5
PN:
set different password (max 4)
E1:
set message text for INPUT 1 event (max 64)
E2:
set message text for INPUT 2 event (max 64)
E3:
set message text for INPUT 3 event (max 64)
E4:
set message text for INPUT 4 event (max 64)
E5:
set message text for INPUT 5 event (max 64)
PT:
set message text for POWER-UP event (max 64)
Inputs & Outputs commands
O1ON
turn relay 1 on
O1OFF
turn relay 1 off
O2ON
turn relay 2 on
O2OFF
turn relay 2 off
O3ON
turn relay 3 on
O3OFF
turn relay 3 off
O4ON
turn relay 4 on
O4OFF
turn relay 4 off
O5ON
turn relay 5 on
O5OFF
turn relay 5 off
O1:xxxxx
defines time period for relay 1 action (in seconds) 0 = infinite
O2:xxxxx
defines time period for relay 2 action (in seconds) 0 = infinite
O3:xxxxx
defines time period for relay 3 action (in seconds) 0 = infinite

O4:xxxxx
defines time period for relay 4 action (in seconds) 0 = infinite
O5:xxxxx
defines time period for relay 5 action (in seconds) 0 = infinite
A1:xxxxx
defines delay for relay 1 reply (in seconds) 0 = no message
A2:xxxxx
defines delay for relay 2 reply (in seconds) 0 = no message
A3:xxxxx
defines delay for relay 3 reply (in seconds) 0 = no message
A4:xxxxx
defines delay for relay 4 reply (in seconds) 0 = no message
A5:xxxxx
defines delay for relay 5 reply (in seconds) 0 = no message
I1:xxx
debounce time for input 1 (in seconds)
I2:xxx
debounce time for input 2 (in seconds)
I3:xxx
debounce time for input 3 (in seconds)
I4:xxx
debounce time for input 4 (in seconds)
I5:xxx
debounce time for input 5 (in seconds)
V1:x
1 - invert input 1
0 - normal input 1
V2:x
1 - invert input 2
0 - normal input 2
V3:x
1 - invert input 3
0 - normal input 3
V4:x
1 - invert input 4
0 - normal input 4
V5:x
1 - invert input 5
0 - normal input 5
A1L:
set analog input 4 low threshold (millivolts)
A1H:
set analog input 4 high threshold (millivolts)
A2L:
set analog input 5 low threshold (millivolts)
A2H:
set analog input 5 high threshold (millivolts)
BAT:
set low battery threshold (millivolts)
BCT:
set charger timeout - time in seconds before device goes to sleep
when Vcc is disconnected. default is 120; 0 = infinite

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CLIP commands
CL:
add clip list number, asterisk symbol (*) is also supported
CD:
remove clip list number
DATA commands
EMAIL:
1 - enable email feature
0 - disable email feature
default is enabled
SMTPIP:XXXXX
defines SMTP server IPv4 address
example SMTPIP:"smtp.aol.com"
max length is 32
SMTPPORT:
defines SMTP server PORT
example SMTPPORT:2121
value must be a number, in range 0..
default is 25
APN:
defines GPRS APN (for emails)
example APN:internet
max length is 32
default is internet
APNUSR:
defines GPRS USERNAME (for emails)
example APNUSR:Patryk
max length is 32
default is empty
APNPWD:
defines GPRS PASSWORD (for emails)
example APNPWD:Patryk
max length is 32
default is empty
SMTPUSR:
defines smtp username (used for authentication - this is not
APN username!)
example SMTPUSR:"p.szymczak"
max length is 64 (according to RFC0821, chapter 4.5.3.
SIZES)
default is empty
SMTPPWD:
defines smtp password (used for authentication - this is not
APN password!)
example SMTPPWD:"p.szymczak"

max length is 64 (according to RFC0821, chapter 4.5.3.
SIZES)
default is empty
FROM:
defines email sender
example FROM:"[email protected]"
max length is 25
default is empty
TO:
defines up to 5 email recipients (separated by ";"), each one
max 25 characters
example TO:"[e-mail]"
max length of field is 129 [(5*25+1)-1]
default is empty
TO1:
defines recipient address for INPUT 1 event
SUB1:
defines email subject that will be sent to "TO1" address
TO2:
defines recipient address for INPUT 2 event
SUB2:
defines email subject that will be sent to "TO2" address
TO3:
defines recipient address for INPUT 3 event
SUB3:
defines email subject that will be sent to "TO3" address
TO4:
defines recipient address for INPUT 4 event
SUB4:
defines email subject that will be sent to "TO4" address
TO5:
defines recipient address for INPUT 5 event
SUB5:
defines email subject that will be sent to "TO5" address
TO6:
defines recipient address for STARTUP event
SUB6:
defines email subject that will be sent to "TO6" address
TO7:
defines recipient address for CALL event
SUB7:
defines email subject that will be sent to "TO7" address
TO8:
defines recipient address for PHOTO event
SUB8:
defines email subject that will be sent to "TO8" address
TO9:
defines recipient address for MOTION event
SUB9:
defines email subject that will be sent to "TO9" address
TO10:
defines recipient address for STATIONARY event
SUB10:
defines email subject that will be sent to "TO10" address
BODY:
defines general body content that can contain substitution
variables

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Camera commands
CAM:
0 - disable camera feature
1 - enable camera feature with photo size 80×64
3 - enable camera feature with photo size 160×128
5 - enable camera feature with photo size 320×240
7 - enable camera feature with photo size 640×480
default is 7 - enabled, with the biggest photo size
PHOTO
used without any parameters, triggers email with cam photo
sending
MOTION:
set motion sensitivity parameter (default is 3), max is 9
STATIONARY:
set stationary parameter (default is 60), max is 999
MTEXT:
set message text for MOTION event (max 64)
STEXT:
set message text for STATIONARY event (max 64)
MS:
1 - enable motion sensor feature
0 - disable motion sensor feature
default is enabled
FS:
1 - enable first stationary event
0 - omit first stationary event
DOTA commands
DOTAAPN:internet.DOTAAPNUSR:"".DOTAAPNPWD:"".DOTAREQ.
DOTAUSR:
set FTP username (max 16)
DOTAPWD:
set FTP password (max 16)
DOTASERVER:
set FTP server IPv4 or domain (max 64)
DOTAFILE:
set filename (max 64)
DOTAAPN:
set APN (max 24)
DOTAAPNUSR:
set APN username (max 12)
DOTAAPNPWD:
set APN password (max 12)
DOTAREQ
trigger DOTA
For Information about software update with DOTA (Download Over The
Air) please contact our Support ([e-mail])
Misc commands
VERSION?
requests current software version

7.2 Variable substitution
In order to display some information in event texts it is possible to include in event text strings
“variables”. When a variable is included in an event text string, the variable is replaced by the
value it is intended to represent in the string that is sent to the user, either via SMS or email.
The following table describes the available variables and the data they represent
•$CALID$
last incoming CLIP number
•$CNT$
X/Y (where X is sent SMS counter and Y is sent EMAIL counter)
•$IN1$, $IN2$, $IN3$, $IN4$, $IN5$
current input value as a string (LOW or HIGH)
•$OUT1$, $OUT2$, $OUT3$, $OUT4$, $OUT5$
current relay value as a string (ON or OFF)
•$IN1T$, $IN2T$, $IN3T$, $IN4T$, $IN5T$
current input value as a integer (0 or 1)
•$OUT1T$, $OUT2T$, $OUT3T$, $OUT4T$, $OUT5T$
current relay value as a integer (0 or 1)
•$VBATM$
battery voltage in milivolts (integer)
•$VBAT$
battery voltage in volts (float)
•$VMAINSM$
mains voltage in milivolts (integer)
•$VMAINS$
mains voltage in volts (float)
•$VIN4M$
input 4 voltage in milivolts (integer)
•$VIN4$
input 4 voltage in volts (float)
•$VIN5M$
input 5 voltage in milivolts (integer)
•$VIN5$
input 5 voltage in volts (float)
Example: E1:battery=$VBAT$. This will send a text message that returns to the configured
number the current battery voltage in the message.

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7.3 Send SMS Commands
By sending a SMS to the STD35 you can switch the outputs or make individual configuration
settings.
Those SMS have the following format which is described below:
In order to avoid unauthorized usage, every configuration command to the STD35 must start
with a 4-digit password.
The last four digits of the IMEI being the password for your device must always be kept a
secret. In this example the keyword is “4244”.
You find your Devices IMEI printed on a sticker on the back of the housing.
The IMEI cannot be changed! Although the password can be changed if needed for security
purposes, you should keep in mind that every command –including setting back to factory
settings –requires the knowledge of the password.
All commands (except R: and ST?) must end with a full stop “.”!
If you need a full stop "." in a parameter as it is for example in an e-mail address or in some
APN-settings, the complete parameter has to be put into inverted commas (“...”) (e.g.
"[e-mail]"), as otherwise the "." would be seen as the end of the command.
All commands can be sent in one SMS; each command has to be separated from the next by a
full stop (see examples).
The parameters for the seconds e.g. command “O1:xxxxx.” can have 1-5 digits. Valid
parameters are e.g. 1 (for 1 second), 90 (for 90 seconds) or 99999 for (99999 seconds). No
leading “zeros” have to be added. Example: “O1:110” stands for 110 seconds.
Please observe the difference between the figure ‘0’ and the letter ‘O’!. (“O1ON.”
contains twice the letter O; “V1:0.” contains once the figure 0)