hopf 8024GPS Technical Manual

_____________________________________________________________

Technical Manual

GPS Sync Module

Model 8024GPS

ENGLISH

Version: 02.00 - 12.09.2018

_____________________________________________________________

Valid for Devices 8024GPS with FIRMWARE

Version: 02.xx

and from

hmc

software

Version: 01.13

Industriefunkuhren

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Elektronik GmbH

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INPORTANT NOTES

8024GPS - GPS Sync Module - V02.00 3 / 76

hopf

Elektronik GmbH

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Version number (Firmware / Manual)

THE FIRST TWO DIGITS OF THE VERSION NUMBER OF THE TECHNICAL MANUAL AND

THE FIRST TWO DIGITS OF THE FIRMWARE VERSION MUST COMPLY WITH EACH OTHER.

THEY INDICATE THE FUNCTIONAL CORRELATION BETWEEN DEVICE AND TECHNICAL

MANUAL.

THE DIGITS AFTER THE POINT IN THE VERSION NUMBER INDICATE CORRECTIONS IN THE

FIRMWARE / MANUAL THAT ARE OF NO SIGNIFICANCE FOR THE FUNCTION.

Downloading Technical Manuals

All current manuals of our products are available free of charge via our homepage on the
Internet.

Homepage: http://www.hopf.com
E-mail: [e-mail]

Symbols and Characters

Operational Reliability

Disregard may cause damages to persons or material.

Functionality

Disregard may impact function of system/device.

Information

Notes and Information.

SERVICE RELIABILITY

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Safety regulations

The safety regulations and observance of the technical data serve to
ensure trouble-free operation of the device and protection of persons and
material. It is therefore of utmost importance to observe and compliance
with these regulations.

If these are not complied with, then no claims may be made under the
terms of the warranty. No liability will be assumed for any ensuing
damage.

Safety of the device

This device has been manufactured in accordance with the latest
technological standards and approved safety regulations

The device should only be put into operation by trained and qualified staff.
Care must be taken that all cable connections are laid and fixed in position
correctly. The device should only be operated with the voltage supply
indicated on the identification label.

The device should only be operated by qualified staff or employees who
have received specific instruction.

If a device must be opened for repair, this should only be carried out by
employees with appropriate qualifications or by

hopf

Elektronik GmbH.

Before a device is opened or a fuse is changed all power supplies must
be disconnected.

If there are reasons to believe that the operational safety can no longer
be guaranteed the device must be taken out of service and labelled
accordingly.

The safety may be impaired when the device does not operate properly
or if it is obviously damaged.

CE-Conformity

This device fulfils the requirements of the EU directive 2014/30/EU
"Electromagnetic Compatibility" and 2014/35/EU "Low Voltage Equipment".

Therefore the device bears the CE identification marking
(CE = Communautés Européennes = European communities)

The CE indicates to the controlling bodies that the product complies with the
requirements of the EU directive - especially with regard to protection of health and safety for
the operator and the user - and may be released for sale within the common markets.

TABLE OF CONTENTS

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Contents Page

1 General .......................................................................................................................... 7

2 Hardware ....................................................................................................................... 8

2.1 Example: Front Panel for DIN Rail Mounting .............................................................................8

2.2 Front Panel Connections ............................................................................................................8

2.2.1 GPS Antenna Connection .....................................................................................................8

2.2.2 Status LEDs ..........................................................................................................................9

2.2.3 Status Optical Coupler ..........................................................................................................9

2.2.4 Serial-Remote Interface for

hmc

software ...........................................................................9

2.3 Back-up Clock ............................................................................................................................9

2.4 Voltage Feed ..............................................................................................................................9

2.5 Further Signal Outputs ...............................................................................................................9

3

hmc (hopf

Management Console) software ........................................................... 10

3.1 Installation on Microsoft Windows ........................................................................................... 10

3.2 Starting the

hopf

Management Console software ................................................................ 11

3.3 The Control Elements ............................................................................................................. 11

3.3.1 The Menu - Area A ............................................................................................................. 12

3.3.2 The Tool Bar - Area B ........................................................................................................ 13

3.3.3 The Device Tree - Area C .................................................................................................. 13

3.3.4 The Main Area - Area D ..................................................................................................... 14

3.3.5 The Status Bar - Area E ..................................................................................................... 14

3.4 Create a serial-remote Connection to

hmc

software ............................................................. 15

3.5 Operation / Display .................................................................................................................. 17

3.5.1 Configuration / Plausibility Check ...................................................................................... 18

3.5.2 Transmit Value Changes ................................................................................................... 18

3.5.3 Read from Device .............................................................................................................. 18

3.5.4 Undo All Changes .............................................................................................................. 19

3.5.5 Load a Configuration File ................................................................................................... 19

3.5.6 Save the Current Configuration ......................................................................................... 19

3.6 Description of the Tabs ........................................................................................................... 20

3.6.1 Time and date – Tab .......................................................................................................... 20

3.6.1.1 Time panel 21

3.6.1.2 Setting Date and Time 22

3.6.1.3 Daylight Saving panel 23

3.6.1.4 Time Zone Selection (Time Zone Offset) panel 24

3.6.2 System – Tab ..................................................................................................................... 26

3.6.2.1 SyncON / SyncOFF 26

3.6.2.2 Reset 27

3.6.3 GPS – Tab ......................................................................................................................... 28

3.6.4 Output – Tab ...................................................................................................................... 29

3.6.4.1 PPS - optional hardware necessary 30

3.6.4.1.1 PPS duration 30

3.6.4.1.2 Minimum Sync.-Status - Status-Dependent Pulse Output 30

3.6.4.1.3 Status of the Signal Output 31

3.6.4.1.4 Output inverted – Polarity of the output Pulse 31

3.6.4.1.5 Special Configuration 31

3.6.4.2 DCF77 - optional hardware necessary 32

3.6.4.2.1 Time Base of the Transmitted DCF77 Pulse 32

TABLE OF CONTENTS

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3.6.4.2.2 Output if blocked - Signal Output in the event of a Fault 33

3.6.4.2.3 Minimum Sync.-Status - Status-Dependent Pulse Output 33

3.6.4.2.4 Status of the Signal Output 33

3.6.4.2.5 Output inverted – Polarity of the output DCF77 Pulse 34

3.6.4.2.6 Special Configuration 34

3.6.4.3 IRIG-B- optional hardware nesessary 35

3.6.4.3.1 Selection of the IRIG-B Format 35

3.6.4.3.2 Timebase – Timebase of the output IRIG-B Signal 36

3.6.4.3.3 Minimum Sync.-Status - Status-Dependent Pulse Output 36

3.6.4.3.4 Status of the Signal Output 36

3.6.4.3.5 Output inverted – Polarity of the output Pulse 37

3.6.4.3.6 Special Configuration 37

3.6.4.4 Cyclic Pulse - optional hardware nesessary 37

3.6.4.4.1 Cyclic Pulse every 37

3.6.4.4.2 Pulse duration 38

3.6.4.4.3 Time Base of the Transmitted Cyclic Pulse 38

3.6.4.4.1 Minimum Sync.-Status - Status-Dependent Pulse Output 38

3.6.4.4.2 Status of the Signal Output 39

3.6.4.4.3 Output inverted – Polarity of the output Pulse 39

3.6.4.4.4 Special Configuration 39

3.6.4.5 Serial Interface - optional hardware necessary 40

3.6.4.5.1 Serial Interface parameter 40

3.6.4.5.2 Timebase – Timebase of the output serial data string 41

3.6.4.5.3 Output scheme 41

3.6.4.5.4 Transmission Time 41

3.6.4.5.5 Special Configuration 42

3.6.4.5.6 String Output 42

3.6.4.6 Parameter Setting - optional hardware necessary 62

3.6.4.7 Status OC 63

3.6.5 Errors – Tab ....................................................................................................................... 64

3.6.6 Device – Tab ...................................................................................................................... 66

4 Fault Analysis / Troubleshooting ............................................................................... 67

4.1 Fault Scenarios ....................................................................................................................... 67

4.1.1 Complete Failure ................................................................................................................ 67

4.1.2 No GPS Reception / No Synchronization .......................................................................... 67

4.1.3 Incorrect Time Output ........................................................................................................ 69

4.1.4 No DST changeover........................................................................................................... 69

4.2 Support from the

hopf

Company ........................................................................................... 70

5 Maintenance / Care ..................................................................................................... 71

6 Technical Data ............................................................................................................ 72

7 Factory default ............................................................................................................ 74

8 Appendix ..................................................................................................................... 76

8.1 GPS (Global Positioning System) ........................................................................................... 76

GENERAL

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1 General

The

hopf

Sync Module 8024GPS is a GPS Module for the reception and evaluation of GPS
signals for high-precision signal generation and output of time information. In combination with
other hardware output modules, rack vesions and power supplies the module can be "custom­tailored" set-up and used for various applications. The configuration of the GPS settings and
the signal generation is made via the serial remote interface.

Some of the Sync Modules 8024GPS basic functions:

• Simple configuration using

hmc

software on remote interface

• Remote interface (Serial-Remote) on the front panel (RS232 format)

• Status LEDs on the front panel

• Status optical coupler on the front panel

• High freewheel accuracy through GPS-supported regulation of the internal quartz base

• Completely maintenance-free system

• SyncOFF timer (reception failure bypassing) for operation free of fault messages - even

in difficult reception conditions

• Redundant multiple validation of the synchronization signal for fault-free and leap-
free signal evaluation

• Maintenance-free, buffered back-up clock for more than three days

Accessories supplied:

• Serial programming cable KA6870 (2m, 9-pole socket to 9-pole socket) to connect
to a PC.

As the Module 8024GPS is supplied in system build-ups, the build-up of the unit and the
system-specific connections and signal outputs are documented in the accompanying manual.

Not all signal outputs parameterizable via the

hmc

software are always

available as physical outputs for the different system variants.
The available functions and their appropriate physical outputs are stated in

device-specific manual.

HARDWARE

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2 Hardware

This chapter describes the connections and LED elements of the Sync Module 8024GPS.

2.1 Example: Front Panel for DIN Rail Mounting

Status (LEDs + Optical Coupler)

3-pole Connector

Pin

Signal

1

Collector (+)

2

n.c.

3

Emitter (-)

LED

Meaning

RD

Status LED red

GN

Status LED green

GPS Antenna

BNC connector

GPS

Antenna Input

Serial-Remote

LED

Meaning

Rx

LED green - reception of serial data

Tx

Led yellow - transmission of serial data

9-pole SUB-D connector

Pin

Signal

1

n.c.

2

RS232c (V.24) RXD

3

RS232c (V.24) TXD

4

n.c.

5

GND 6 n.c.

7

n.c.

8

n.c.

9

n.c.

n.c. = not connected

2.2 Front Panel Connections

2.2.1 GPS Antenna Connection

The coaxial cable of the GPS antenna equipment is connected to the BNC socket marked
"GPS Antenna" on the front panel. Further specifications concerning the installation of the
antenna equipment, such as cable lengths and cable types, can be found in the document
titled "GPS Antenna Equipment".

HARDWARE

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2.2.2 Status LEDs

The status LEDs on the front panel signal the module's current (synchronization) status. The
meanings of the LEDs are as follows:

LED RD

- Red

LED GN

- Green

Status

STATUS

Code

Off

ON

Sync (radio-synchronous) with quartz regulation

SYNC

Off

Flashes

Sync (radio-synchronous) - SyncOFF timer running

SYOF

Flashes

ON

Sync (radio-synchronous) - simulation mode

SYSI

Flashes

Flashes

Quarz - SyncON timer running

QUON

ON

ON

Quarz - time was set via synchronization source

QUEX

ON

Flashes

Quarz - time set manually or after reset

QUSE

ON

Off

No valid time

INVA

Off

Off

No operating voltage / faulty

---

3Hz

Off

General Module Error (PCID)

INVA

3Hz

Invert

3Hz

User settings missing
(Difference time / ST-WT Changeover)

INVA

2.2.3 Status Optical Coupler

The status optical coupler provides a potential isolated switching contact for monitoring the
modules synchronization status.

Function:
Status output via 3-pole terminal with selection of the desired synchronisation status at which

reporting is to be activated:
Optical coupler:

• Selected status or better achieved – Optical coupler switched through

• Selected status not achieved – Optical coupler blocked

The desired reporting status is set via the

hmc

software.

2.2.4 Serial-Remote Interface for

hmc

software

The connection to a PC’s RS232 serial interface is made by means of the KA6870 interface

cable supplied.
The Serial-Remote interface for the configuration of the module is located on its front panel.

The transmission line (Tx) and reception line (Rx) have status LEDs which signal the activity
on the respective interface line.

No further configuration of this Serial-Remote interface is necessary.

2.3 Back-up Clock

The module has a maintenance-free, buffered backup clock for at least three days.
After a power failure the clock starts with the internal back-up clock information unless valid

time information was available beforehand.

2.4 Voltage Feed

The voltage feed takes place via the integrated power supply in the device.

2.5 Further Signal Outputs

Further available signal outputs of the respective system are stated in the accompanying
manual of the specific-device.

HMC (HOPF MANAGEMENT CONSOLE) SOFTWARE

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3

hmc (hopf

Management Console) software

This Chapter describes the operation and functionality of the

hopf

Management Console

(further abbreviated with

hmc

software) for the Sync Module 8024GPS.

3.1 Installation on Microsoft Windows

The installation routine is started via a double click on
HMC_v01.13_b1190_Windows_install.exe . A query for the installation routine's language will
appear - select English and click OK.

The installation wizard has been started now. In the lower area there are three buttons: Back,
Forward, Cancel. The Back button allows returning to previous steps at any time, in order to
see or change the settings there. If the settings in a step of the installation seem to be in order,
the button Forward will lead to the next step. The Cancel button allows leaving the installation

wizard at any time, in which case no installation of the

hmc

software will be performed on the

computer.

Step 1, The Welcome Screen
Information is shown, partly of a legal kind concerning the

licence conditions for the

hmc

software. Activating the Forward

button implies having read the information and accepting the
licence conditions.

Step 2, Installation Directory Selection
Instead of the standard installation directory, on a English
language Windows Installation this would be C:\Program

Files\Hopf, it is possible to install the

hmc

software into any
other directory. This allows the parallel installation of different
versions.

Step 3, Finalization
In this place, the user is informed that the next activation of the

Forward button will start the

hmc

software installation process,

following the settings made in the previous steps. In case of
concordance with these settings, the installation process is to
be commenced by activating the Forward button.

Step 4, The Installation Process
A progress bar indicates how much of the installation process
has been accomplished. It is necessary to wait until the
installation process is finished.
Cancel allows to cancel the process at any time. In this case, a
complete installation will not be performed.

Step 5, Confirmation
The user is informed that the

hmc

software has been
successfully installed. Activating Finish will close the installation
wizard. The

hmc

software has now been prepared for use and

may be started.

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3.2 Starting the

hopf

Management Console software

In the Microsoft Windows Start Menu, under Programs and in the directory

hopf

, there is an

entry

hopf

Management Console. A simple click on this entry will start the

hmc

software.

Before the

hmc

software main window pops up, a splash

screen is shown. It contains a visualization of the

hmc

software start-up progress.

3.3 The Control Elements

• A - Menu: Access to all main features

• B - Tool Bar: Fast access to device management and help

• C - Device Tree: All integrated devices are visualized here

• D - Main Area: The welcome screen and the configuration area of connected devices

are shown here.

• E - Status Bar: Status information is shown here, to the right there are the language
selection and busy indicator.

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3.3.1 The Menu - Area A

Submenu File

o Exit: Closes the

hmc

software. In case there are changes not yet transmitted, or

devices in a special state, a confirmation dialog is shown before closing.

Sub Menu Devices

o New: Integrate a new device. See Opening a device.
o Remove: Removes the selected device from the device tree. In case there are

changes not yet transmitted, or devices in a special state, a confirmation dialog is
shown before removal.

o Restore Connections: Restore all devices which have been connected after the last

program termination. After program start no device is connected automatically.

o Connect: Connect to the unconnected device selected in the device tree.
o Disconnect: Close the connection to the connected device selected in the device

tree. In case there are changes not yet transmitted, or devices in a special state, a
confirmation dialog is shown before disconnecting.

o Driver Management: Opens the driver management dialog, which shows details

about installed drivers and allows the addition of new drivers. See Driver
Management.

Sub Menu Tools

o View DCF77 Record: allows opening a DCF77 reception data record file from the file

system.

o Network configuration assistant: opens the Network Configuration Assistant. See

Network Configuration Assistant.

o NTP Analysis: opens the NTP Analysis dialog.
o View GPS Record: opens the GPS Record dialog.
o Verbose Logging: Enables/Disables verbose logging for detailed diagnosis. Should

be enabled only in error situations.

Sub Menu Help

o Info: Opens the Info Dialog, which shows the

hmc

software version number, as well

as contact information.

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3.3.2 The Tool Bar - Area B

Integrate a new device

Like New in Menu Devices

Remove a device from the tree

Like Remove in Menu Devices

Reconnect devices

Like Reconnect Devices in Menu

Devices

Connect to a device

Like Connect in Menu Devices

Disconnect a device

Like Disconnect in Menu Devices

Show the info dialog

Like Info in Menu Devices

Show symbol explanations

3.3.3 The Device Tree - Area C

In the device tree, all devices are shown which are integrated in the

hmc

software. The
devices may be in connected or disconnected state. The difference is indicated by dictinct
icons and font weights.

Representation of a connected device

Representation of a disconnected device

All devices are visualized as sub elements of a main element representing the overview panel
and serving as a collective indicator showing the presence of not yet transmitted changes,
erroneous input and error statuses for connected devices.

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3.3.4 The Main Area - Area D

In the main area, depending on the element selected in the device tree, either the welcome
panel, system overview or the selected device's configuration view is shown.

3.3.5 The Status Bar - Area E

At the left side of the status bar, warnings, error end activity messages are shown. At the right
side there is a language selector and a busy indicator showing that communication with a
device is taking place. Background communication like error status requests or communication
only suited to keep alive connections, is not indicated here.

When another than the active language is selected in the language selector, all shown texts
are exchanged to texts in the newly selected language. If a text is not available in the selected
language, the generally available English version of the text is shown.

In case there are changes not yet transmitted, or devices in a special state, a confirmation
dialog is shown before the language switch is performed.

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3.4 Create a serial-remote Connection to

hmc

software

After the physical connection has been established via the serial programming cable KA6870
between the Serial-Remote interface of the Sync Module 8024GPS and a free serial interface
on the PC, the PC COM port used must be set up.

The menu item Devices / New and the Button in the tool bar both open the New Device
wizard:

First, the Communication Channel to the device 8024GPS to be opened has to be defined as
RS232. Forward confirms the selection.

Configuration of computer's serial port with serial parameters (9600-8-N-1, like shown in the
screenshot). Forward confirms the selection.

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Probe connecting device 8024GPS. Forward confirms the selection.

Choice of using device driver. Finish confirms the selection and generate the remote
connection to the 8024GPS.

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3.5 Operation / Display

When the connected device is selected in the device tree, the

hmc

software main area shows

the configuration view of the connected device.

The configuration view is divided into functional tabs. Click on one of these tabs to navigate
through the board. The selected tab is identified by a darker background colour, see the above
image (tab "Time and date" in this case).

On top and to the right in the configuration view, there is a tool bar for reading and setting
device properties, as well as for loading and saving complete configurations.

Transmit changes to the device.

Read all configuration properties from the device. Changes not yet
transmitted may be lost.

Undo all recent changes without re-reading from the device.

Load a complete configuration from a file.

Save the current configuration to a file.

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3.5.1 Configuration / Plausibility Check

A reconfigured and not saved parameter is shown with a black changing-asterisk in the tab
and in the device tree.

In case of an invalid input, a red asterisk will be shown and the causing input control is
highlighted with pink background colour.

Transmitting values to a device is not possible whenever an invalid input is present.

3.5.2 Transmit Value Changes

Pushing the button , transmit changes to device, all present configuration value changes
that have not yet been successfully transmitted to the device are transmitted immediately. The
action is going to fail if there are any invalid inputs in any of the device's tabs. In that case, the
effort will result in an error dialog. Transmission will always affect all changes in all tabs.

3.5.3 Read from Device

The button , read all values from device, causes a complete re-read of all values from the
device, losing all eventually present changes that have not yet been transmitted.

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3.5.4 Undo All Changes

Pushing the button , undo all changes, will discard all eventually present changes that have
not yet been transmitted without reading the new state from the device.

3.5.5 Load a Configuration File

Pushing the button , load a configuration file, starts a file-open-dialog for choosing a
configuration file to load into the device. This file must have been saved using the exact same
device driver, otherwise loading the configuration is going to fail showing an error dialog.

This file must have been saved using the exact same device driver.

3.5.6 Save the Current Configuration

Pushing the button , save the current configuration, starts a file-save-dialog for defining a
target file to which the currently active configuration of the device will be saved for later loading
into the same or another device using the exact same device driver.

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3.6 Description of the Tabs

The

hmc

software is divided into the following tabs:

• Time and date

• System

• GPS

• Output

• Errors

• Device

3.6.1 Time and date – Tab

All of the time and status information of the Sync Module 8024GPS is displayed or set in the
Time and date tab.

During first commissioning it is mandatorily required to configure the
difference time to UTC and the changeover times for summer/winter time
or to deactivate them respectively. Otherwise synchronization via GPS will
not be possible and the corresponding "Software Errors" are indicated.

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hopf

Elektronik GmbH

Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]

3.6.1.1 Time panel

All of the current time and status information is displayed under the Time panel.

A new date/time information can only be set if valid values for the difference
time and the daylight saving time are stored.

DATE / TIME

Local Time / UTC

Week day

Mon, Tue, Wen; Thu; Fri, Sat, Sun

Year

2000 ... 2099

Month

01 ... 12

Day

01 ... 31

Hour

00 ... 23

Minute

00 ... 59

Second

00 ... 59

SYNC STATUS

Display of the current status of synchronization of Module 8024GPS with the following possible
values:

SYNC

Time synchronized + Quartz regulation started/running

SYOF

Time synchronized + SyncOFF running

SYSI

Time synchronized as simulation mode (without actual GPS reception)

QUON

Quartz/Crystal time + SyncON running

QUEX

Quartz/Crystal time (in freewheel after synchronization failure
 Board was already synchronized)

QUSE

Quartz/Crystal time after reset or manual setting

INVA

Invalid time

System Overview

This table gives a direct overview of the current operating states.

Info-Box

Description

DST

When indicated, daylight saving time is active.

Changeover

When indicated, an announcement is active for daylight
saving time change-over at the end of the current hour.

Leap second

When indicated, there is an announcement for a leap-second
which is going to be inserted at the end of the current hou

Simulation

Some devices support a simulation mode.

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Elektronik GmbH

Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]

On the right side of the Time panel the following three buttons are located:

Switch the time display between local time and UTC
(Universal Time Coordinated) time

Quick Help: Explanation of reception quality codes

Set Date / Time

3.6.1.2 Setting Date and Time

The button Set Date / Time opens the set time dialog.

This dialog is initialized with the computer's current time. All values are changeable. After
pushing the OK button, the time configuration values will be sent to the clock immediately.

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hopf

Elektronik GmbH

Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]

3.6.1.3 Daylight Saving panel

The Daylight Saving panel allows the configuration of the points in time for the beginning and
the end of the daylight saving time. If daylight saving time shall not be applied the "DST
Changeover" checkbox must be deactivated.

The parameters are configurable in such a way that the changeover may be applied at any
point in time.

If the DST Changeover checkbox is deactivated local time is calculated without considering
daylight saving time. The calculated local time corresponds to standard time which is defined
by the time zone offset applied to UTC time.

Value range

DST changeover

active / inactive

Week

first ... fourth, last

Day

Monday ... Sunday

Month

January ... December

Hour

00 ... 23

Minute

00

Sometimes the setting of the last day-of-the-week in December may lead
to erroneous results and is therefore not permitted!

Input example for Germany (CET/CEST)
WT (CET)  ST (CEST) at 2 a.m. on the last Sunday in March.
Input: from last Sunday in March at 02:00 a.m.

Changeover WT (Standard / Winter Time)  ST (Summer Time)

local time

UTC

difference UTC  local time

01:59:58 h

00:59:58 h

+1 hour

01:59:59 h

00:59:59 h

+1 hour

03:00:00 h

01:00:00 h

+2 hours

03:00:01 h

01:00:01 h

+2 hours

ST (CEST)  WT (CET) at 3 a.m. on the last Sunday in October.
Input: to last Sunday in October at 03:00 a.m.

Changeover ST (Summer Time)  WT (Standard / Winter Time)

local time

UTC

difference UTC  local time

02:59:58 h

00:59:58 h

+2 hours

02:59:59 h

00:59:59 h

+2 hours

02:00:00 h

01:00:00 h

+1 hour

02:00:01 h

01:00:01 h

+1 hour