Filename: User Guide Sabre Mk5 Rev 0.0.doc
Page 14 of 28
5.5. Voucher Decryption and Processing
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 vouchers comprise of 20-digit numbers.
The following STS voucher types will be recognised and accepted:
•
Electricity
credit
(meter-specific voucher) – refer to paragraph 5.5.1.1.
•
Set
1st dispenser key
(meter-specific voucher) - refer to paragraph 5.5.1.2.
•
Set
2nd dispenser key
(meter-specific voucher) - refer to paragraph 5.5.1.3.
•
Clear
tamper
(meter-specific voucher) - refer to paragraph 5.5.1.4.
•
Set
maximum
power load
or
power limit
level (meter-specific voucher) - refer to
paragraph 5.5.1.5.
•
Set
current credit levels
(meter-specific, proprietary voucher) - refer to
paragraph 5.5.1.6.
•
Clear
credit
(meter-specific, proprietary voucher) - refer to paragraph 5.5.1.7.
•
Initiate
dispenser test
(non meter-specific voucher) - refer to paragraph 5.5.1.8.
•
Commissioning voucher
(non meter-specific, proprietary voucher) - refer to
paragraph 5.5.1.9.
•
Commissioning
voucher (meter-specific, proprietary voucher) - refer to
paragraph 5.5.1.10.
•
Decommissioning
voucher (meter-specific, proprietary voucher) - refer to
paragraph 5.5.1.11.
•
Set Options Register
(meter-specific, proprietary voucher) – Refer to paragraph
5.5.1.12 below.
5.5.1.1. Electricity Credit Voucher
The electricity credit voucher transfers a variable quantity of credit to the meter.
5.5.1.2. Set 1
st
Dispenser Key Voucher
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, vouchers vended from that system will not be accepted by the
meter.
To effect a key change, two vouchers (
set 1
st
dispenser key
and
set 2
nd
dispenser
key
) need to be issued and entered into the meter within a 5-minute period of each
other. NB:
set 1
st
dispenser key
and
set 2
nd
dispenser key
vouchers may be
entered in any sequence i.e. the
2
nd
dispenser key voucher
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).
5.5.1.3. Set 2
nd
Dispenser Key Voucher
Refer to paragraph 5.5.1.2 above.
5.5.1.4. Clear Tamper Voucher
If a meter has been
tampered
, normal operation can only be restored by entering a
clear tamper
voucher. Note that these vouchers also reset the
power-fail counter
.
Note:
the “TAMPER DETECT” function in the meter is NOT set as for previous
versions of meter software.
