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8315 L&J Tankway Software Description TankGate Interface
22 Installation and Operations Manual
4.1.4 Communications
There are two communications tasks - one for each of the communication channels.
COM ports 0 and1 are used to interface to external devices or host systems. Refer to the
Hardware Chapter for the location of these ports.
COM0 and COM1
COM 0 and 1 can be configured for communications to Host systems using a variety of
protocols. For COM 0 and 1 the communication interfaces include the following:
• RS-485 for use in multi-drop configurations or long cable runs (or both)
• RS-232 for flexibility in configuring other types of communications links such
as radio and fiber optic interfaces
• RTS/CTS lines are available for hardware handshaking.
4.1.5 Protocols
The TankGate is fully compatible with FuelsManager® software. It is also compatible with
a variety of other Host systems including through Modbus protocol.
The default communication settings for the COM ports are as follows:
4.1.6 Data Scanning Task
The Data Scanning Task is dedicated to the scanning of field input data from tank
gauges. The input data is stored in arrays that are subsequently accessed by the Point
Executive.
4.1.7 Database Manager
The Database Manager is a collection of programs and data. The Database Manager
allows the TankGate system executive to access data from the database in an organized
and program-independent manner. It resides in non-volatile RAM.
The Database Manager also contains a Database Dictionary. This dictionary describes
how the database is organized and also provides information describing how data
should be presented to the operator.
After power-up or system reset, a CRC verification of each point in the database is
performed. If the CRC does not have a match for the point, then it is disabled and a flag
is set indicating that the point is invalid.
4.1.8 System Tasks
System tasks include the Calendar Task, which manages Time and Date functions. Other
system tasks include utility routines for checksum calculations, diagnostics, start-up
and initialization.
COM Port Protocol Baud Rate Data Bits Parity Stop Bits
COM0
RTU Slave or
Modbus - Auto-
sensing
9600 8 N 0
COM1
Modbus 9600 8 N 0