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Future work on this data can be carried out whilst the SMART communicator is connected to the loop, in
which case all changes will be immediately sent to the MSM400, or after disconnection of the Communicator,
in which case the amended programme will have to be stored in the “OFFLINE” register of the communicator.
The Psion Organiser has four separate registers of data relating to the MSM400 control unit. These registers
are named WORKING, SAFE, OFF-LINE and DEFAULT, and are explained in Section D13.0. All changes and
operations occur in the Working Register, identified by W on the right hand end of line 2 on the display. The
other registers are for storage and transfer of data between transmitters or for reference.
D7.0 Introduction and FUNCTION menu
The microprocessor in the MSM400 control unit retains the calibration required for the particular application
or tank involved, once this has been entered into the memory (EEPROM). On the initial interrogation of the
control unit, this information is transferred to the SMART Communicator using the HART protocol, which
defines the command structure and message format.
When received by the SMART Communicator, these messages are loaded into the WORKING register (which
resides in the Psion Organiser memory), which then adds the descriptions and other information shown on the
4 line liquid crystal display. The operator is presented with the information he requested, in a meaningful
format in relation to the application.
The first selections of the MSM400 control unit programme use a menu structure, where the operator
identifies the part of the programme required from a list of options available. The detailed information under
each menu item can be inspected, after selection, by scrolling through the listing. Each item is given an
identifier in the top right hand corner of the screen, identified by a parameter reference number, to allow
accurate recording of the data interrogated and to simplify communications relating to this data.
The programme is divided into two main sets of data, selected from the FUNCTION menu. The FUNCTION
menu is the first programme screen presented when the data from the control unit is accepted and
interrogation is to begin.
***** FUNCTION *****
Calibration
Monitor Program
Info Toggle access
Help D**
MONITOR – The data presented on selecting MONITOR is the live “read only” information from the control
unit, for example the liquid level in the tank, and the value of the current output. These parameters are
labelled D, for Display information parameters, and are indexed between D200 and D265. The Display
parameters are described and listed in Section D10.0
PROGRAM – The data presented on selecting PROGRAM is the operator adjustable data used to configure the
control unit for the particular application. These are “read/write” parameters, labelled P for Program
parameter, and are indexed from P300 to L104. The Program parameters are described and listed in Section
D10.0
FIXED DATA – These are the MOBREY factory preset display parameters, identifying the equipment type, serial
number, software information, etc.
BACK UP – This menu item controls the transfer of data between registers or a file available in the Psion
Organiser memory: operation is described in Section D13.0.
D** - Allows direct access to a Display parameter by entering the relevant code number.
HELP – The HELP information display screens give some introductory advice on the use of the keys on the
Psion Organiser and the Programme structure.