LEFM 200 Modbus User Manual IB0147 Rev. 8
December 2010 Page 1 Section 1
1.0 PURPOSE
This manual documents the parameters and Modbus addresses necessary for typical maintenance
of the LEFM 200 transmitter. It includes the addresses and locations of typical setup
configuration values and output data. It also defines the formats and ranges for these values.
This manual is for use with interfacing the LEFM 200 transmitter with other systems. If a user
interface is all that is required, then use the LEFMLink interface program available from
Cameron.
The parameters defined include the following:
• Flow scaling and counts factor
• Analog interface parameters
• Modbus and display interface parameters
The transmitter will accept any value in a given field (provided it is the expected format and
address, for example floating point or integer and not character). However, there are values that
produce illogical inputs. Therefore, this document defines and recommends ranges for all inputs
based on engineering analysis.
1.1 Related Documents
The LEFM 200 and SoundTrack transmitters use the Modbus protocol for serial communication:
Modicon Modbus Protocol Reference Guide (PI-MBUS-300 Rev. C) dated January 1991.
The following documents may also be useful:
Cameron LEFM280C, LEFM 240C and 220C Installation and Operation Manuals
SoundTrack Installation and Operation Manual
Cameron LEFM 210E Installation and Operation Manual
1.2 Intended Audience
The LEFM 200 flowmeters and SoundTrack Interface detectors can be customized following the
information provided in this manual. This manual is intended to be used by plant site operators,
site engineers, and supervisory personnel. This manual assumes the reader is familiar with the
terminology typically used with Modbus.
1.3 Procedure
Note: Always read a register’s value first in order to confirm its current value before it is
changed.
1. Identify the Holding Register to be changed.
2. Read the contents of the Holding Register to confirm its as-found value.
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