Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual page 50

Direct Connect
Direct connect is an RS-232 connection between a PC (normally a laptop) and the FMU. This is a
practical option for communications to the FMU where communications conduit are not available, or
wireless communications are not practical. See Appendix D for instructions in making a direct connection
to an FMU with a laptop. Connection with a desktop may be made following the same guidance. The PC
used to direct connect to the FMU to download transaction data or upload authorization data must use the
FuelMaster® software instead of Hyperterminal or Procomm Plus.
Direct connections between a laptop and an FMU is not possible with DoD software. Direct connections
using Hyperterminal or Procomm is possible between a laptop and FMU. DoD customers desiring direct
connect capability must use a two-way ringdown device between a laptop and FMU, and configure the
software to assume an analog phone line connection.
Though effective communications between the Central Controller and FMU are an option with a direct
connection, FMU communications to a credit card network is not possible by extending an RS-232
connection to a building where it is converted to an analog phone line.
Credit Card Authorization
Credit card authorization for retail operations is through a wired or wireless phone line connection to the
FMU. Reference Through analog phone lines or Through a phone line extender, above, for a
description of the communication methods used for credit card authorization.
Dispenser Compatibility
Dispensers are of two basic types: mechanical and electronic. Mechanical dispensers may be controlled
directly by FuelMaster
must be added to acquire quantity pulses from the dispenser. The dispenser must have a pulse output
accessible by FuelMaster
Electronic dispensers have an internal CPU (central processing unit) which controls dispenser functions. The
CPU typically requires two-wire communications inputs from a proprietary device (OEM control box) to initiate
dispensing functions and extract quantity information. FuelMaster
to make the required connection and communicate with the dispenser CPU. Appendix H explains the
application and installation of the Electronic Dispenser Interface Kit.
Appendix B contains a sample Dispenser Compatibility List with instructions for making the FMU interface
with a majority of commercially available domestic and international fuel dispensers. This listing is updated
periodically to include any new information acquired by Syn-Tech Systems relating to dispenser interfaces.
Request the lastest Dispenser Compatiblity List from Syn-Tech Systems' Customer Satisfaction Center for
FuelMaster compatibility with the dispenser of choice.
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Dispenser Control
Dispenser Control is the term used to describe how FuelMaster
dispensing hose. FMUs must be installed to attain individual control of each dispensing hose. Dispensers
with multiple hoses must have a means for individually controlling each dispensing hose. In some cases
this may require the installation of solenoid valves; one per dispensing hose. The base FMU provides for
control of two dispensing hoses. Additional hose controls are optional.
Syn-Tech Systems will not dictate a control method which must be used for all situations. Instead, the
pros/cons of each control method will be explained so the installer and customer may select the
control method that best suits the application. Site layout and construction, pump handle detection,
and economics must be considered when selecting an appropriate control method. Detailed wiring
instructions will be found in the Installation section of this manual.
Dispenser control by FuelMaster
FuelMaster
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through a hardwire or cable interface. Sometimes a pulse output option or pulser
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may best be simplified by considering the FMU a switching device
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Installation Manual
uses an Electronic Dispenser Interface Kit
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controls the output of product from a
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