National Instruments NI-FBUS - Manual (Page 121)

Appendix B Troubleshooting and Common Questions
NI-FBUS Configurator User Manual B-12 ni.com
Fisher Rosemount 3244MS rev3 (Link Master device) does not show
up on the bus.
The Fisher Rosemount 3244MS rev3 temperature transmitters are
intrinsically safe link master devices. With the default timing settings, they
do not appear on the bus. These devices require the tweaking of some bus
parameters for them to show up in the NI-FBUS Configurator. Revision 2
of the 3244MV works fine without these adjustments. These changes are
made by right-clicking the link (the top level in the hierarchy) and selecting
Advanced View. Now the MIB parameters appear underneath the
representation of the interface board. Double-clicking the MIB will bring
up a block configuration window where these values can be changed.
• Make the interface PRIMARY_LINK_MASTER_FLAG parameter FALSE .
• Make the interface CONFIGURED_LINK_SETTINGS match those of the
Rosemount device. The values for the
CONFIGURED_LINK_SETTINGS on the Rosemount transmitter are
(in order): 10, 6, 5, 37, 0, 12, 186, 2, 1, 0, 4.
At the time of publication, Fisher Rosemount was advising customers to
make the following changes to the advanced settings.
Caution Do not modify these parameters without good reason. If you must modify
parameters for certain devices, the device manufacturer will recommend settings.
Modifying these parameters can have an adverse affect on data throughput rates. If settings
are incorrectly modified, some devices may disappear off the bus.
Table B-1. Rosemount Advanced Parameter Settings
Parameter Value
T1 0x17700
T2 0x1D4C00
T3 0x249F0
Slot Time 8 or higher
Maximum Response Delay 3 or higher
Minimum inter-PDU Delay 12 or higher
CONFIGURED_LINK_SETTINGS Make the same for all link masters
on the link