Technical Specifications

62 | =GE Oil & Gas

Multiplexor Setup and Operation

ValVue ESD supports the MTL HART multiplexor allows you to monitor and operate many SVI II

ESD PST controllers from a single computer.

The MTL 4840 HART maintenance system is a widely used multiplexor for communicating with

HART instruments. Connected to a computer serial port with an RS232/RS485 converter, the

multiplexor is capable of supporting up to 31 nodes, each with the capability of supporting up

to 16 sub nodes. Each sub node can control 16 loops. Therefore, the multiplexor provides the

potential to communicate with a maximum of 7936 HART loops, i.e., 31 (nodes) x 16 (sub

nodes) x 16 (loops) using one computer interface. Additionally, the multiplexor supports the

multidrop connection of HART devices on a single loop. Therefore, using the multidrop feature

it is possible to expended capacity of a system beyond 7936 HART devices.

For more information regarding the MTL multiplexor, refer to the manufacturer’s documents.

Using the multiplexor capability of ValVue ESD and the MTL multiplexor, monitoring and

communicating with many SVI’s and other HART devices is possible. After start-up and login to

the ValVue ESD program, the Connected Devices screen appears and provides options to

setup the multiplexor.

Use of the optional multiplexor ValVue ESD software requires an additional license and

registration. Contact your local representative for licensing assistance. A 60 day trial of the

multiplexor option is provided without licensing.

Selecting Mux Setup

To select the Mux Setup function:

1. Check Use Multiplexor and select the baud rate and node in the ValVue ESD Set Options

(see “Mux Option” on page 61) return to the Connected Devices page.

2. Right-click on the Connected Devices page and select Mux Setup (Figure 58).