Off-line Configuration

Off-line configuration requires the use of the PC software briefly described below.

Once configured, the configuration parameters are stored in non-volatile memory

within the MTL838C.

The PC software

By far the simplest method of configuring the MTL838C is using the PC software.  This

software has been specifically designed to perform all of the complex calculations that

must be carried out, in order to configure the unit.  These calculations are transparent

to the user, and this method provides a convenient and time efficient method.

Alternatively, as explained before, the master could read the configured parameters

after initial off-line configuration and these may then be stored within the host for use

in the event of a database failure.

Interconnection of the MTL838C

The MTL838C may be connected to a Modbus host in a number of ways—as was

mentioned earlier it may be connected for multi-drop or point-to-point operation.

Two RS485 ports, 1 and 2. are provided on the MTL838C. As there are two ports the

unit can either be connected to a single Modbus master, with dual redundancy, or

connected to two separate Modbus hosts.

The MTL838C will respond on whichever RS485 connection the query is received,

and there is no restriction placed on the simultaneous use of both interfaces.  The

slave address for each RS-485 port is set using the PC Software.