8315 L&J Tankway Software Description TankGate Interface
60 Installation and Operations Manual
4.19.2 Application

The LJ2000 point provides an interface to L&J MCG2000 Gauges. L&J Model 2000

Gauges are connected directly to a Model 8315 Tank Gauge Interface Module. The

Model 8315 is automatically detected at startup, and an LJSCAN point is automatically

created to manage the scanning task. The Module parameter determines which Model

8315 will be used. The ID must match the unit address of the MCG2000.

Maxtime Specifies the maximum time (in secs) between automatic Change
of State data being sent to the Host in response to a Change of
State Request. Report must be set to either Low or High for the
Value parameter to be sent in response to a Change of State
Request. A value of 0 disables this option. Non-zero values
cause responses to be sent even if the value has not changed
since the last message. The maximum is 255 seconds. The
default is 240.
Watchdog Enables the watchdog task on the Motherboard. The watchdog
task monitors the LJ2000 point on the Model 8315 and verifies it
is scanning for gauges. If the Model 8215 fails, the 0x4000 and
the 0x0010 bits of the PntStatus will be set to indicate the failure.
Dynamic Parameters Function
Level Floating point value representing the tank level (in feet).
Temp Floating point value representing the tank temperature (in
Fahrenheit).
PntStatus Integer HEX value indicating status of point. Values are:
0x0002: Scan Timeout
0x0010: Gauge Not Responding
0x0020: Blown Transmit Fuse
0x0040: Parity Error
0x0080: Tankway Error
0x4000: Failure of the Model 8315. This bit is set if the
Watchdog task on the Motherboard determines that the Model
8315 has stopped updating.
GaugeStatus Byte value indicating status of the gauge.
AlarmTime Time that alarm first occurred. The point is in alarm when the
PntStatus is non zero.
Elapse Time of the last scan.
ScanTime Time of the last good reading. A reading is considered good if it
has no parity or time-out error, and has passed the filter criteria.
Raw1 Raw data from gauge. Value reported as hexadecimal value.
Raw2 Raw data from gauge. Value reported as hexadecimal value.
PntCheckSum CRC-16 Checksum for point's static Configuration Parameters.
Configuration Parameters Function