7
Modbus Interface Manual
LP Series
Note:
Whenever program mode is exited from the display the unit will reset
itself to insure all changes have been accepted. The reset will take
approximately 5 seconds before the level transmitter is able to respond
to commands.
Note:
In program mode, the transmitter will not respond to incoming
Modbus commands. A busy error will be sent to the controller to
notify the unit is in program mode. This function will prevent a user at
a remote terminal from programming the unit while a user is accessing
program mode from the display.
6.2 Display Diagram
UP Arrow
– Used to move cursor on screen up and to increment num-
ber.
DOWN Arrow
– Used to move cursor on screen down and to decrease
number.
SCROLL Arrow
– Used to move cursor on screen to the right, cursor will
cycle back.
ENTER Key
– Used to Enter Program Mode, select Highlighted Item, and
Confirm Selection.
EXIT Key
– Hidden key in the middle of the display that is used to exit
menu at any time.
MEASURED VARIABLE
– The process variable that is selected to display.
The display will automatically scroll between selected variables.
MEASUREMENT
– The numerical value for the MEASURED VARIABLE
shown on the display.
UNITs
– Unit of measurement for the MEASURED VARIABLE shown on
the display.
TEMPERATURE
– Average temperature for the product in the tank. Only
shown if the level transmitter was purchased with temperature.
NOTIFICATIONS
– Four squares with letters. Top left square will always
be present indicating a D for DDA mode or a M for Modbus mode. Top
right square, A, will only show when there is an alarm. Toggle the
UP Arrow key to view alarms. Bottom right square, F, will only show
when there is a fault. Toggle the DOWN Arrow key to view error codes.
Bottom left square, P, will only show when the unit is being programmed
remotely.
6.3 Menu Structure
• Data From Device
Display
Units
`
Length Units
`
Temp Units
`
Volume Units
Address
Signal Strength
`
Prod Trig Lvl
`
Int Trig Lvl
`
Roof Trig Lvl
• Calibrate
Product Level
`
Current Level
`
Offset
Interface Level
`
Current Level
`
Offset
Roof Level
`
Current Level
`
Offset
• Factory
Settings
`
Gradient
`
Serial Number
`
HW Revision
`
SW Revision
`
SARA Blanking
`
Magnet Blanking
`
Gain
`
Min Trig Level
Temp Setup
Float Config
Auto Threshold
Baud Rate
Volume
Reset to Factory
7. Alarms
The Modbus output is equipped with several alarms that will be shown
on the display. Use the stylus to tap the Up arrow to view alarms. The
Modbus output is set to fail high, greater than the order length, if there
is an issue and the level value output cannot be trusted.
Fig. 1: Modbus Display
