Varec TankGate Interface 8315 Series - Manual (Page 64)

Tank Gate Interface
54 Installation and Operations Manual
5.4.2 Application
The LJ2000 point provides an interface to L&J MCG2000 Gauges. L&J Model 2000 Gauges are
connected directly to a Model 8215 Tank Gauge Interface Module. The Model 8215 is
automatically detected at start up, and an LJSCAN point is automatically created to manage the
scanning task. The Module parameter determines which Model 8215 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 8215 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 8215. This bit is set if the Watchdog task
on the Motherboard determines that the Model 8215 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