Landis & Gyr Cashpower Gemini HMI User manual

Cashpower Gemini HMI –Version 11 Firmware
Cashpower Prepayment Metering
Cashpower Gemini HMI
User Guide
Document version: 0.0
Date: 14th December 2011
Issued by Product Management: Dave Tarr
© 2011 Landis+Gyr (Pty) Ltd
Electricity Prepayment Meters
Residential

2/35 Released Introduction
© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
Revision history
Version
Date
Originator
Comments
0.0
14/12/2011
Dave Tarr
First Release

Introduction Released 3/35
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Table of Contents
1Introduction______________________________________________________________________6
2Human-Machine Interface (Meter)____________________________________________________7
3Customer Interface Unit (CIU)_______________________________________________________8
4Liquid Crystal Display Indications __________________________________________________10
4.1 Load switch Status Indicator _____________________________________________________11
4.2 Alarm Indicator________________________________________________________________11
4.3 Remaining Credit Indicator ______________________________________________________11
4.4 Information Indicator ___________________________________________________________11
4.5 Currency Indicator _____________________________________________________________12
4.6 Power (kWh) Indicator__________________________________________________________12
4.7 Happy and Sad Faces__________________________________________________________12
5LED Indicators __________________________________________________________________13
5.1 Rate of Consumption Indicator (Rate LED)__________________________________________13
5.2 Alarm LED (Customer Interface Unit Only) __________________________________________13
6Optical Communications Port (Meter only)___________________________________________14
7General Meter Operation __________________________________________________________15
7.1 Entering tokens via the keypad ___________________________________________________16
7.2 Token Processing _____________________________________________________________16
7.2.1 Incomplete Token ___________________________________________________________16
7.2.2 Complete Token ____________________________________________________________16
7.2.2.1 Token Accepted _________________________________________________________16
7.2.2.2 Token Accepted as a Valid Key Change Number _______________________________16
7.2.2.3 Token Overflow Rejection _________________________________________________17
7.2.2.4 Incorrect Token__________________________________________________________17
7.2.2.5 Duplicate Token _________________________________________________________17
7.2.2.6 Expired Token___________________________________________________________17
7.3 Token Decryption and Processing_________________________________________________17
7.3.1 Electricity Credit Token _______________________________________________________18
7.3.2 Set 1st Dispenser Key Token __________________________________________________18
7.3.3 Set 2nd Dispenser Key Token__________________________________________________18
7.3.4 Clear Tamper Token _________________________________________________________18
7.3.5 Set Power Limit Token _______________________________________________________18
7.3.6 Set Credit Levels Token ______________________________________________________18
7.3.7 Clear Credit Token __________________________________________________________18
7.3.8 Initiate Dispenser Test Token (Non Meter-Specific Token) ___________________________19
7.3.9 Commissioning Token (Non Meter-Specific Token) _________________________________19
7.3.10 Commissioning Token (Meter-Specific Token)_____________________________________19
7.3.11 Decommissioning Token (Meter-Specific Token) ___________________________________19
7.3.12 Set Credit Metering Mode (Meter-Specific Token) __________________________________19
7.3.13 Set Prepayment Metering Mode (Meter-Specific Token) _____________________________19
7.3.14 Set Energy Limiting Mode (Meter-Specific Token) __________________________________20
7.3.15 Set DAE Value (Meter-Specific Token)___________________________________________20
7.3.16 Force Load Switch Open (Meter-Specific Token)___________________________________20
7.4 Commissioning and Decommissioning the Meter _____________________________________20
7.5 Power Limiting ________________________________________________________________20

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7.6 Reverse Power Detection and Metering____________________________________________ 21
7.7 Automatic/Manual Load Reconnection_____________________________________________ 21
7.8 Disconnect on Power Failure ____________________________________________________ 21
7.9 Optical Port__________________________________________________________________ 21
7.10 Credit Reader Interface_________________________________________________________ 21
8Anti-tamper Features ____________________________________________________________ 22
8.1 General _____________________________________________________________________ 22
8.2 Anti-Tamper Switch____________________________________________________________ 22
8.3 Reverse Energy Detection ______________________________________________________ 22
8.4 Resetting a Tamper Condition ___________________________________________________ 22
9Meter Operation (Prepayment Metering Mode) _______________________________________ 23
10 Meter Operation (Credit Metering Mode)_____________________________________________ 24
11 Meter Operation (Energy Limiting Mode) ____________________________________________ 25
11.1 Daily Allocation of Energy (DAE) _________________________________________________ 25
11.2 Operation ___________________________________________________________________ 25
11.3 Alarms______________________________________________________________________ 26
12 Customer Interface Unit - Specific Functions ________________________________________ 28
12.1 General _____________________________________________________________________ 28
12.2 Audible Low-Credit Alarm_______________________________________________________ 28
12.3 Other Audible Tones___________________________________________________________ 28
13 Information Functions____________________________________________________________ 29
13.1 Meter Number (Register 000)____________________________________________________ 30
13.2 Instantaneous Power (Register 001) ______________________________________________ 30
13.3 Current Credit Register –0.1kWh Resolution (Register 002)____________________________ 30
13.4 Total Units Counter –0.1kWh Resolution (Register 003)_______________________________ 30
13.5 DAE Accumulated Credit Register –0.001kWh Resolution (Register 004) _________________ 30
13.6 Current 24-Hour Consumption (Register 006) _______________________________________ 30
13.7 Previous 24-Hour Consumption (Register 007) ______________________________________ 30
13.8 Current 30-Day Consumption (Register 008)________________________________________ 30
13.9 Previous 30-Day Consumption (Register 009)_______________________________________ 30
13.10 DAE Value –0.01kWh Resolution (Register 011) ____________________________________ 30
13.11 Low Credit Level (Register 012) __________________________________________________ 31
13.12 High Credit Level (Register 013)__________________________________________________ 31
13.13 Power Limit Level (Register 014) _________________________________________________ 31
13.14 Extended Meter Number (Register 024)____________________________________________ 31
13.15 Scrolling Meter Number (Register 025) ____________________________________________ 31
13.16 Meter (Fixed) State Register 1 (Register 030) _______________________________________ 31
13.17 Meter (Fixed) State Register 0 (Register 031) _______________________________________ 32
13.18 Meter (Changeable) Option Register 0 (Register 035)_________________________________ 32
13.19 Meter (Display) State Register 0 (Register 037)______________________________________ 33
13.20 Software Version Number (Register 048)___________________________________________ 33
13.21 Power-Fail Counter (Register 050)________________________________________________ 33
13.22 Last Token ID in Date/Time Format (Register 054) ___________________________________ 33
13.23 Identifier of Last Token Entered (Register 055) ______________________________________ 33

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13.24 Value of Last Token Entered (Register 056)_________________________________________33
13.25 Key Revision and Key Type (Register 057)__________________________________________33
13.26 Tariff Index (Register 058)_______________________________________________________33
13.27 Current Credit Register –0.001kWh Resolution (Register 059) __________________________33
13.28 Supply Group Code (SGC) Register (Register 060) ___________________________________33
13.29 Total Units Counter –0.001kWh Resolution (Register 061) _____________________________34
13.30 Current Credit Register –0.000001kWh Resolution (Register 062) _______________________34
13.31 DAE Accumulated Credit Register –0.000001kWh Resolution (Register 063) ______________34
13.32 DAE 15-Second Portion Register –0.000001kWh Resolution (Register 064) _______________34
13.33 Low Credit Level –0.000001kWh Resolution (Register 065) ____________________________34
13.34 Latch Inhibit Timer –1-Minute Resolution (Register 066)_______________________________34
14 Error Codes_____________________________________________________________________35
14.1 Meter _______________________________________________________________________35
14.2 Customer Interface Unit_________________________________________________________35

6/35 Released Introduction
© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
1 Introduction
Cashpower Gemini HMI is part of the Gemini family of prepayment meters and is a single-phase,
keypad-based, stand-alone or split prepayment electricity meter in a British Standard housing. If used
as a split prepayment meter, it comprises two parts, namely the meter and the customer interface unit.
The Gemini MMI can be used as a stand-alone prepayment meter, typically
installed inside the household, or can be used as a split prepayment meter by
simply connecting the customer interface unit, which will then be the customer‟s
only interface with the meter.
When used as a split metering solution, the meter is usually installed in a secure, locked enclosure,
typically a pavement kiosk or pole-mounted equivalent. The customer interface unit is usually installed
in a convenient location in the consumer‟s home - remote from the meter and is connected to the
meter with a pair of communications wires.
Figure 1: Customer Interface Unit
Figure 2: Gemini HMI Split Prepayment Meter

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2 Human-Machine Interface (Meter)
Figure 3: Meter typical front panel features
Rate of Consumption Indicator (Rate LED): This red LED provides both a visual indication of
instantaneous power consumption as well as the reference output for verifying the meter‟s
metrological accuracy.
Optical Communications Port: This port enables data to be transferred to and from the meter (e.g. the
accessing of various registers or downloading of new parameters) using a portable interrogation
device. The optical port‟s communication protocol complies with IEC 62056-21 Mode C.
LCD Display. Large custom LCD with language independent icons
Keypad: The meter has a 12-key non tactile keypad with audible feedback. The keypad is used for
entry of tokens and accessing various management functions and meter parameters via the
information mode. The keypad also has a backspace key.
Rate of consumption
indicator (rate LED)
1000 pulses/kWh
Backspace Key
In case of consumer key press
error
Optical
communications port
Meter label
Each meter has a
unique identity label
printed at the time of
manufacture
LCD Display
With language independent
icons
Keypad
12-key keypad with audible
feedback for key presses
Terminal Cover
Supplied with short or long
terminal cover depending on
utility requirements
Sealing Screw
Use of utility sealing wires
shows visible signs of
tampering
Information Key
For entering the
information mode to read
meter parameters

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© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
3 Customer Interface Unit (CIU)
Figure 4: Customer Interface Unit front panel indications
The customer interface unit comprises a non-tactile, 12-key keypad with audible feedback (for the
entry of tokens and accessing of various management functions), and a custom LCD (for the display
of remaining credit, the scrolling in of keypad entries and various meter status and management
functions).
A red rate of consumption LED provides a visual indication of instantaneous power consumption.
The rate LED on the customer interface unit is not a reference output and may not
be used for verifying the associated meter‟s metrological accuracy.
A yellow alarm LED indicator duplicates the alarm indication function on the LCD. Its main function is
to give a visible indication of low credit levels.
The customer interface unit is effectively a remote display and keypad for the meter. Communications
between the two units takes place in real time e.g. keypad entries at the customer interface unit are
processed by the meter and echoed to the customer interface unit display.
Rate of consumption
indicator (rate LED)
Liquid Crystal Display
With language independent
icons
Associated meter
serial number
(Connected to this unit)
12-key keypad
Alarm indicator
Indicates low credit
(Visual & Audible)
Information key
(For entering into
information mode to
read meter
parameters)
Backspace key
In case of consumer key
press error

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Figure 5: Customer Interface Unit - Rear View

10/35 Released Liquid Crystal Display Indications
© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
4 Liquid Crystal Display Indications
The LCD is designed to give a clear and unambiguous visual indication of the important meter functions
by means of language-independent pictograms:
Figure 6: What the ICONS mean
Figure 7: Operational Displays
1- Happy face
2- Sad Face
3- Alarm indicator
4- Load switch status indicator
5- Remaining credit indicator
6- Information mode
7- Currency function
8- Power (kWh) function
9- Not used
10 - Eight X 7 segment digits
Normal Operation
Zero Credit
Display shows remaining credit (kWh).
Load switch closed and consumption
rate indicator flashes at a rate
proportional to the power being used.
Credit running low and more needs to
be purchased to avoid disconnection
of supply.
Supply disconnected.
Low Credit Warning
Power Limit Lockout
Supply disconnected.
Energy Limiting
Mode
Display shows the amount of
accumulated energy currently
available. The credit wedge will always
be scrolling –up, if energy credit is
accumulating, or down, if it is
decreasing.
Scrolling wedge

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4.1 Load switch Status Indicator
This icon indicates the status of the meter‟s internal load control switch.
Under normal operating conditions i.e. with the meter in credit, the load switch will be „closed‟ and
power supplied to the consumer. It will „open‟ when credit expires.
4.2 Alarm Indicator
This is a „low credit‟ warning indicator that turns on if the remaining credit value is greater than zero,
but less than half the low credit level programmed into the meter. Under these conditions it is
displayed in conjunction with the smallest credit wedge icon on the LCD.
4.3 Remaining Credit Indicator
This „wedge‟ provides a quick visual indication of the remaining credit in the meter and functions as
follows:
Displays all four credit wedge icons if the credit register is greater than, or equal to, the high
credit level.
Displays the three smallest credit wedge icons if the credit register is greater than, or equal to,
the low credit level but less than the high credit level.
Displays the two smallest credit wedge icons if the credit register is greater than or equal to half
the low credit level, but less than the low credit level.
Displays the smallest credit wedge LCD icon if the credit register is greater than zero, but less
than half the low credit level.
If the remaining credit is less than or equal to zero, all the credit wedge icons will be off.
When the remaining credit level reaches zero, the numeric display indicates
0.0kWh. If, for any reason, the credit level is decremented below zero i.e.
negative, the display indicates 0. kWh. This is the case if the meter has been
personalised not to display negative credit. Although there is no negative value
displayed, it gives a quick visual indication that a negative value is present.
The Remaining Credit Indicator‟s function varies slightly, depending on which mode the meter is
operating in.
In prepayment mode, the wedge segments toggle at pre-defined (token-settable) credit levels.
In energy limiting mode, the wedge icons are continuously scrolling from either left to right or
right to left. If the amount of energy being consumed by the connected load is less than the rate
at which energy credit (DAE) is being added i.e. the overall energy credit level in the meter is
increasing, it scrolls from left to right. If the amount of energy being consumed by the
connected load is more than the rate at which energy credit (DAE) is being added i.e. the
overall energy credit level in the meter is decreasing, it scrolls from right to left.
The rate at which energy credit is added depends on the value of the DAE. This
value is typically set to zero at the time of manufacture and can then be set to any
value with an appropriate engineering token from the prepayment vending system
at the time of installation.
4.4 Information Indicator
This icon turns on in response to pressing the information key on the keypad. It indicates that the
meter is in information mode and the contents of various registers can be viewed.

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© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
4.5 Currency Indicator
This icon is turned on when the meter is in the Credit Mode.
4.6 Power (kWh) Indicator
This function is used whenever the displayed units represent power (kWh). It applies to both normal
meter operation as well as when viewing registers via the information mode.
The power (kWh) icon will also flash at a rate of 1flash per second if no energy is
being consumed i.e. if the meter is in creep lock.
4.7 Happy and Sad Faces
These two icons are used in combination to give a quick visual indication of good and bad status. For
example, if the meter were operating normally, the happy face would be on. However, if it were to be
tampered, the sad face would come on. Similar responses would apply during token entry e.g.
entering an invalid Credit Transfer Number would result in the sad face flashing for a short period of
time.

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5 LED Indicators
5.1 Rate of Consumption Indicator (Rate LED)
The rate at which energy is being consumed is indicated via the red rate LED. This is the reference
output for determining the meter‟s metrological accuracy. It also gives a quick visual indication of
electricity usage e.g. a fast rate when a stove is in use and a large amount of electricity being
consumed.
The meter constant for Gemini HMI meter is set to 1000 impulses/kWh. The rate LED will therefore
flash 1000 times for every kWh of energy consumed.
The rate LED on the customer interface unit is not a reference output and may not
be used for verifying the associated meter‟s metrological accuracy.
5.2 Alarm LED (Customer Interface Unit Only)
On the Customer Interface Unit, the alarm indicator functionality of the LCD is duplicated on a flashing
yellow LED to give a very clear visual indication to the consumer that the credit level is low and
disconnection of the electricity supply could occur soon.

14/35 Released Optical Communications Port (Meter only)
© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
6 Optical Communications Port (Meter only)
This port enables data to be transferred to and from the meter (e.g. the accessing of various registers
or downloading of new parameters).

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7 General Meter Operation
It is possible to switch the meter between any one of its three modes of operation at any stage via
engineering tokens generated by the prepayment vending system.
Display and control functions common to all modes of operation are described in this section. Mode-
specific functions are described in subsequent sections.
Figure 8: Entering tokens into the keypad of the meter
Figure 9: Typical displays
Normal operating mode
(includes zero credit and supply disconnected)
Number not recognized by meter
Number already used
Not enough digits entered
(30 second timeout)
Service call-out
Number expired
Power off
Meter tampered
Normal operating mode
(Includes zero credit and supply
disconnected)
Number not recognized by meter
Number already used
Not enough digits entered
(30-second timeout)
Meter Tampered
Service callout
Number expired
Service callout
Enter the 20 digit number
as it appears on the token,
into the meter via the
keypad.
An audible „beep‟ is heard
on each key press.
Incorrect entries can be
corrected with the
backspace key.
Incomplete number entries
will be cleared after 30
seconds.
After entering a complete,
valid number, the new
credit total is displayed.

16/35 Released General Meter Operation
© Landis+Gyr (Pty) Ltd Cashpower Gemini HMI –User Guide
7.1 Entering tokens via the keypad
Tokens such as credit, set power limit and tamper reset, are entered into the meter by keying in the
numbers printed on the token via the keypad. The numbers entered are displayed on the LCD as they
are being entered and scroll from right to left, with a decimal point displayed at every fourth digit for
ease of viewing.
Visual feedback is provided by flashing the happy face icon with each key press.
Audible feedback is provided by a „beep‟ on each key press.
Incorrect entries can be corrected with the backspace key, which removes the rightmost digit on the
LCD with each key press. Two backspace key presses in quick succession will clear the entire entry.
Acceptance of a valid token is automatic. Once a complete token has been entered, the meter
processes it and, depending on the result, displays one of the sequences described in –refer section
7.2. Again, depending on what sequence is invoked, the keypad could remain locked for a variable
period of time i.e. it will not respond in any way to further key presses.
An incomplete token entry will be timed-out after 30 seconds; where after the customer interface unit
reverts to normal operation.
7.2 Token Processing
Depending on the type of token entered into the meter, it will result in one of the display sequences
described below:
7.2.1 Incomplete Token
A token entry is timed out if no key is pressed for more than 30 seconds. On time-out:
The token number is cleared off the display.
The remaining credit is displayed.
The happy face icon is turned on.
The sad face icon is flashed for 10 seconds.
7.2.2 Complete Token
If a complete token is entered, the meter:
Locks the keypad.
Proceeds to process the token number.
Depending on the result of the processing, one of the following sequences can occur. Refer to
sections 7.2.2.1 through - 7.2.2.6.
7.2.2.1 Token Accepted
A scrolling credit wedge is displayed.
7.2.2.2 Token Accepted as a Valid Key Change Number
Note: Two tokens are required for a STS key change.
The scrolling credit wedge is displayed.
The key revision and key type, followed by the tariff index, is displayed during the above
scrolling sequence.

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7.2.2.3 Token Overflow Rejection
This occurs if the token is valid, but rejected because the current credit register would overflow.
The following is displayed:
The happy face icon is flashed.
The sad face icon is turned on for 10 seconds.
If the token is rejected because the current credit register would overflow, the token
can be used at a later stage when the credit in the meter has reduced.
7.2.2.4 Incorrect Token
If the token is rejected, the following will be displayed:
The happy face icon is turned off.
The sad face icon is flashed for the reject time.
NB: The reject function is included to discourage the entry of random numbers in an attempt to
defraud the meter. The reject time will eventually settle at a maximum time of 82.5 seconds.
7.2.2.5 Duplicate Token
If the token is rejected because it has previously been entered i.e. a duplicate token:
Both the happy face and sad face icons are flashed simultaneously for 5 seconds.
7.2.2.6 Expired Token
If the token is rejected because it is older than the oldest token in the meter log i.e. „expired‟:
Both the happy face and sad face icons are alternately flashed for a period of 5 seconds.
7.3 Token Decryption and Processing
The Gemini HMI Version 11 meter will only accept tokens in the STS format.
The meter accepts information transferred as specified in the Standard Transfer Specification release
1.0:1995 with key typing included. Key expiry is not implemented.
STS tokens comprise 20-digit numbers.
The following token types will be recognised and accepted:
Electricity credit (meter-specific token) –refer to section 7.3.1.
Set 1st dispenser key (meter-specific token) –refer to section 7.3.2.
Set 2nd dispenser key (meter-specific token) –refer to section 7.3.3.
Clear tamper (meter-specific token) - refer to section 7.3.4.
Set maximum power load or power limit level (meter-specific token) - refer to section 7.3.5.
Set current credit levels (meter-specific token) - refer to section 7.3.6.
Clear credit (meter-specific token) - refer to section 7.3.7.
Initiate dispenser test (non meter-specific token) - refer to section 7.3.8.
Commissioning (non meter-specific token) - refer to section 7.3.9.
Commissioning (meter-specific token) - refer to section 7.3.10.
Decommissioning (meter-specific token) - refer to section 7.3.11.
Set credit-metering mode (meter-specific token) - refer to section 7.3.12.

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Set prepayment-metering mode (meter-specific token) - refer to section 7.3.13.
Set energy limiting mode (meter-specific token) - refer to section 7.3.14.
Set DAE value (meter-specific token) - refer to section 7.3.15.
Force latch open (meter-specific token) - refer to section 7.3.16.
7.3.1 Electricity Credit Token
The electricity credit token transfers a variable quantity of credit to the meter.
7.3.2 Set 1st Dispenser Key Token
Key changes are occasionally carried out to maintain the security of a pre-payment system. Unless
the prepayment vending system and meter are both operating on the same key, tokens vended from
that system will not be accepted by the meter.
To effect a key change, two tokens (set 1st dispenser key and set 2nd dispenser key) need to be
issued and entered into the meter within a 5-minute period of each other. NB: set 1st dispenser key
and set 2nd dispenser key tokens may be entered in any sequence i.e. the 2nd dispenser key token
may be entered first.
Note: Various ancillary functions e.g. clearing the meter log may be embedded into the key-change
process (refer to the STS specification).
7.3.3 Set 2nd Dispenser Key Token
Refer to - 7.3.2.
7.3.4 Clear Tamper Token
If a meter has been tampered, normal operation can only be restored by entering a clear tamper
token.
This token also reset the power-fail counter - refer to section 13.21.
7.3.5 Set Power Limit Token
This token sets the power limit level for the meter - refer to section 7.5.
7.3.6 Set Credit Levels Token
On accepting a power limit level number, the meter sets the appropriate high and low credit levels.
These are the levels at which the segments in the „wedge‟ of the LCD credit indicator toggle. NB. The
scaling factors of these tokens are different between prepayment and energy limiting modes of
operation.
7.3.7 Clear Credit Token
On accepting a clear credit token, the meter clears any remaining credit to zero and opens the load
switch, thus interrupting the electricity supply to the customer.

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7.3.8 Initiate Dispenser Test Token (Non Meter-Specific Token)
There are a number of non-meter-specific tokens that can be used to test various functions on the
meter. NB: These tests pertain to the meter and not the customer interface unit. .
On accepting an initiate dispenser test token, the meter executes all the tests that are embedded in
that particular token. The following tests are supported:
In a test sequence (test all), each test has a duration of 2.5 seconds, and is performed in the above
order. For a single test per token, the test has a duration of 5 seconds.
On completion of the test sequence, the meter returns to its normal mode of operation.
7.3.9 Commissioning Token (Non Meter-Specific Token)
This function is used to assist meter installation personnel by ensuring that the load remains
disconnected and the tamper detect sensing switch function disabled (meter decommissioned). Once
the installation is complete and the number entered, the load switch closes and the tamper detect
sensing switch function is enabled.
7.3.10 Commissioning Token (Meter-Specific Token)
This is a meter-specific token that would operate in the same way as described in section 7.3.9
In the case of the Gemini HMI Split Meter (incorporating Energy Limiting Mode of operation), it
performs an additional function when operating in Energy Limiting mode –refer to section 7.4.
7.3.11 Decommissioning Token (Meter-Specific Token)
On accepting a decommissioning token, the meter opens the load switch (load disconnected) and
disables the tamper detect sensing switch function.
In the case of the Gemini HMI Split Meter (incorporating Energy Limiting mode of operation), it
performs an additional function when operating in Energy Limiting Mode –refer to section 7.4.
7.3.12 Set Credit Metering Mode (Meter-Specific Token)
On accepting a set credit metering mode token, the meter commences operation as described in
section 10.
7.3.13 Set Prepayment Metering Mode (Meter-Specific Token)
On accepting a set prepayment metering mode token, the meter commences operation as described
in section 9
Function
Token Number
Open the load switch
0000 0000 0001 5099 7584
HMI test - turns on all the LED’s, displays all
segments on the LCD, and activates the buzzer
0000 0000 0001 6777 4880
Display the total units counter
0000 0000 0002 0132 8896
Display the key revision number and key type
1844 6744 0738 4377 2416
Display the tariff index
3689 3488 1475 5332 2496
Display the power limit level
0000 0000 0012 0797 4400
Display the tamper state
0000 0000 0022 8172 8512
Display the instantaneous power
0000 0000 0044 2920 8064
Display the software version number
0000 0000 0087 2419 5840
Test all the above functions (tests run
sequentially)
5649 3153 7254 5031 3471

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7.3.14 Set Energy Limiting Mode (Meter-Specific Token)
On accepting a set Energy Limiting mode token, the meter commences operation as described in
section 11.
7.3.15 Set DAE Value (Meter-Specific Token)
This function is only applicable when operating in Energy Limiting mode –refer to section 7.4.
7.3.16 Force Load Switch Open (Meter-Specific Token)
This token provides a facility to independently disconnect the supply to the customer. On accepting a
force latch open token, the meter opens the load switch (load disconnected).
Note that in the energy limiting mode of operation (refer to section 11), personalisable options exist to
be able to enable or disable the incrementing of the DAE once the latch has been forced open.
7.4 Commissioning and Decommissioning the Meter
When decommissioned, the meter ceases to increment the DAE. On entering a meter-specific
commissioning token, DAE incrementing commences at the defined rate.
The meter‟s commissioned / decommissioned status can be observed in the meter state register.
7.5 Power Limiting
The power-limiting feature allows utilities to set the maximum load that can be drawn by customers.
The setting can be changed when necessary via a set power limit token from the prepayment vending
system. It is implemented as follows:
If the preset power limit threshold is exceeded, the load switch will open for a period (factory set
period of between 30s and 180s), after which it will re-close (either automatically or manually -
refer to section 7.7).
If the power limit threshold continues to be exceeded, the above process is repeated. If, after 4
power-limit events within a 15-minute window, the limit is still being exceeded because of
excessive energy consumption, the load switch will be opened for a period of 30 minutes (the
power limit lockout period).
At the end of the lockout period, the load switch will re-close (either automatically or manually
by pressing any key on the keypad - refer to section 7.7) and, unless the excessive loading has
been removed, the process will be repeated. Note that tokens may be entered and the
information modes accessed as normal during the power limit lockout period.
When in the power limit lockout mode, it is possible to view the remaining lockout time via
information register 066 - refer to section 13.34.
If the power drawn by the customer is reduced in response to a power limit disconnect, the
event will be ignored after 15 minutes has elapsed.
Power limiting is not a form of safety overload protection. It is designed to
generally limit the overall usage of power in a particular area (possibly dictated by
reticulation limitations or linked to a tariff allocation).
Display during 30-second
power limit periods
Display during 30-minute
power limit lockout period