TT8900 OPT
–
Installation and Service Manual
Page 9 of 41
1.4
Tandem Configurations
Depending on the particularities and requirements of some
installation sites, the TT8900 can be deployed in tandem
configuration, having a primary OPT driving one or more
secondary OPT units.
The secondary OPTs lack the T20 SCM forecourt control unit
found in the primary OPT, therefore any peripherals a refuelling
site might have, such as Automatic tank Gauging or a Price Sign
can only be connected and controlled through the primary
TT8900 OPT.
Note: Secondary OPTs have a slightly different External Connections Label, applied inside the
unit, as covered in
chapter 2.13 Forecourt Connections
1.5
Offline Modes
Dealing with authorising electronic payments, the TT8900 OPT default mode of operation is the
Online Mode, where all transactions are validated in real time, through its permanent Internet
connectivity.
However, if Internet connectivity gets disrupted, the TT8900 OPT automatically switches to one
of its Offline Modes. Each having a distinctive behaviour, there are a total of 7 Offline Modes to
choose from prior to deployment, by filling in the
Offline Mode Application Form
.
Offline Mode Description
Online Only
The only authorisation method accepted for any transaction is Online Mode.
Any Internet connectivity disruption will render the OPT unusable.
Retail 1
Total exposure is limited to the Total Offline Transaction Limit. Exposure
per Id is limited to the Transaction Number Limit multiplied by the Floor
Limit.
Retail 2
Total exposure is limited to the Total Offline Transaction Limit. All Ids can
run up the daily dollar limit each day the system is offline.
Commercial 1 The exposure per Id is limited to the Transaction Number Limit multiplied
by the Transaction Volume Limit per Id.
Commercial 2 All Ids can run up the daily volume limit each day the system is offline.
Basic 1
A basic offline authorization mode that disallows active Ids that haven't had
recent use. Offline authorizations are not subject to volume, amount or
frequency limits.
Basic 2
A very basic offline mode that has no refuelling restrictions. Offline
authorizations are not subject to volume, amount or frequency limits.
Note: Electronic payment authorisation can fall back to an (previously agreed on) offline mode
for local account cards only. Consequently, the only authorisation method accepted for bank
issued cards is Online Only.
