Installation manual

Reference Manual

00809-0100-4075, Rev CA

Section 5: Operation and Maintenance

March 2014

Operation and maintenance

5.3 Advanced setup

5.3.1 Configure advanced update rate

The “Configure Update Rate” method sets all three update rates based on one user input. The

“configure Advanced Update Rate” method allows for each update rate to be set independently

of the other two. Values for all update rates are between 8 seconds and 60 minutes. Only one

update rate can be set to 8 seconds.

In AMS Select Manual Setup and then the Wireless tab.

5.3.2 4-20 mA current

This optimizes the THUM Adapter to the available loop current.

There are two options “Variable Current Mode” and “Fixed Current Mode”. Variable current

mode is the default mode and is used when the current on the loop is changing between 3.5 mA

to 25 mA.

Fixed Current mode is user selectable. This mode is for when the current on the loop is fixed and

will not drop below 15 mA. If the current drops below 15 mA when the THUM Adapter is in fixed

current mode, there may be issues with network traffic, and the THUM Adapter may drop off of

the wireless network. The HART loop will not be affected.

In AMS Select Manual Setup and then the Wired Device tab.

5.3.3 Voltage drop

This optimizes the THUM Adapter to the available voltage on the loop. There are two options:

Variable and Fixed. Variable is the default mode. In Variable mode the THUM drops between

2.25 V at 3.5 mA and 1.2 V at 25 mA. In Fixed mode the THUM will always drop 2.25 volts. Fixed

mode is used for verifying that there is enough voltage on the loop in the loop check procedure.

In AMS Select Manual Setup and then the Wired Device tab.

5.3.4 Discovery mode

The discovery mode is how the THUM Adapter determines which wired device it will update for.

There are 3 modes “First Device Found”, “Fixed Polling Address”, and “Fixed Mapping”. The

default mode is First Device Found. In First Device Found Mode, the THUM Adapter will update

for the first wired device that it finds on the wired bus. This mode is best used when there is only

one device on the wired bus. If more than one wired device is found, the THUM Adapter will go

into alert.

Fast Keys

2, 2, 1,3

Fast Keys

2, 2, 2,1

Fast Keys

2, 2, 2,2

Fast Keys

2, 2, 2,3