MTL4850  HART® maintenance system

This instruction manual describes the procedures for installing, connecting, checking and maintaining the
MTL4850 HART® maintenance system, which is a simple interface between smart devices in the field and
HART instrument management software running on a PC.
The following sections are outlined here.
Section 2 describes the system and the solutions available
Section 3 covers some safety aspects.
Section 4 deals with the installation of carriers and mounting backplanes
Section 5 describes installing and configuring the modules
Section 6 provides information on fault finding, and maintenance
Section 7 introduces software for the MTL4850 System.
See the MTL web site (www.mtl-inst.com) for the full specifications of the MTL4850 system components
and accessories, and the MTL4500 Series isolators mentioned in this manual.

MTL4850

The MTL4850 HART Maintenance System enables a user to calibrate, configure and maintain an entire
network of ‘smart’ field devices from a single workstation.
The key element that makes this possible is the MTL4850 module, which provides the multiplexing for the
individual field devices, making each one addressable and identifiable from the workstation.
The other important element is the terminal circuit board that simplifies the interconnection of the field
devices to the MTL4850 module. A range of terminal boards and backplanes has been designed to suit
most general applications but custom versions can also be designed to suit individual OEMs and their
applications.

The MTL4850 module uses a plug-in style with fixing screws to provide a simple and secure installation
method onto the backplane.
Up to 32 field devices can be accommodated by a MTL4850 HART multiplexer module, which is
then connected via an RS485 to USB (or Ethernet) converter, to the PC running the HART maintenance
software. Depending upon the management software, up to 63 of the MTL4850 modules can be
connected to it, making a potential count of 2016 smart field devices on one serial link. See Figure 2.1
for a diagrammatic impression of this structure.
For intrinsically safe applications, consideration must be given to the safety parameters for each field
loop. For further information, please refer to MTL or your local representative.