Technical Specifications

ValVue Digital Communications Software Ver. 2.80

GE Oil & Gas

Retry Count Enter the number of times the multiplexor retries sending a com-

mand to a Hart device before returning with an error. The valid range

for this number is 0 to 5. The recommended number for use with Val-

Vue is 3.

Preamble Count Enter the number of preambles. A Host using the HART protocol

sends a short preamble string of characters at the beginning of each

communication to wake up the other device. The number of pream-

bles prefixed to each Hart command sent to a device varies from

device to device. The valid range is 2 to 20. Recommended values for

this parameter are 3 to 5 when using the Mux.

Scan Age Time Enter the maximum scan time in seconds that scan data remains

valid. An error is returned when scan data is requested more than

the age time since the data was last updated. This parameter is

available here to set for other applications that use the multiplexor.

ValVue does not support the scanning feature.

Master Mode Primary Mas-

ter/Secondary Masters

Select such that ValVue is configured to be the same type of master

as the multiplexor. Use both the Options and Multiplexor Setup dia-

logs to check and compare the selection. Both can be primary or

both can be secondary; they cannot be different.

Search Method When building a device list, the multiplexor can use one of three

ways:

 Polling Address 0 only: This method looks only at polling

address 0 for each loop. Any devices on a loop with a

non-zero polling address are not found.

 One Device: For each loop, all polling addresses are searched

until a device is found. The multiplexor does not continue the

search on a loop after the first device is found.

 Multidrop: Polling addresses 0 - 31 are searched as per the

selections on the Options dialog ( “Configure the Set Options”

on page 41), and any devices found are added to the device

list.

Scan Option The MTL multiplexor has the capability to continually scan the con-

nected Hart devices to report the results. ValVue does not use this

feature, but the option is provided to configure the multiplexor as

needed by other applications.

Mux Reset

Click and the multiplexor rebuilds its table of live devices. You are prompted for the node that

is to be reset. When reset, the multiplexor node re-scans all of the devices connected to it and

depending upon the options set for the multiplexor, can take some time to complete. If

hardware has been added to the Mux or connected to different Mux channels a rescan must

be performed before the ValVue re-scan can be used.