PACSystems VersaMax Genius Network Interface User Manual Section 4
GFK-1535D Jan 2023
Configuration 71
Baud Rate: Genius bus communications can occur at any of four baud
rates: 153.6 Kbaud standards, 153.6 Kbaud extended, 76.8 Kbaud, or 38.4
Kbaud. The default is 153.6 K baud standard. The Genius I/O System
User's Manual gives guidelines for baud rate selection. Each device's
communications baud rate must be the same as that used by all other
devices on the bus.
Report Faults: Selects whether or not the NIU will perform any fault
reporting. If you want to set up partial fault reporting for the station, set
this Report Faults parameter to YES, and set the Report Faults parameter
for selective individual modules in the station to No.
BSM Present: If the NIU will be used as a bus-switching device itself, or
located on a bus stub downstream of another device that acts as a bus-
switching device, BSM Present should be set to YES. For all other
applications, set it to NO. Please refer to Section 6: Redundancy for more
information about configuring the Redundancy features.
BSM Controller: If the NIU will be used as the bus-switching device itself,
set BSM Controller to YES. For all other applications, set it to NO. Please
refer to Section 6: Redundancy for more information about configuring
the Redundancy features.
Output Time Default: The parameter only applies when BSM Present is
set to YES. If the total bus scan time is expected to exceed 100mS, set the
Output Default Time to 10 seconds. The Output Default Time is normally
2.5 seconds. If the Bus Interface Unit stops receiving outputs from the
Bus Controller, it will wait for this specified period before defaulting
outputs in the station. Please refer to Section 6: Redundancy for more
information about configuring the Redundancy features.
CPU Redundancy: If the NIU will have two or more bus controllers (on
the same Genius bus), the NIU must be configured for a CPU Redundancy
mode other than None. Please refer to Section 6: Redundancy, for more
information about configuring the Redundancy features.
Hot Standby: When configured for Hot Standby mode, the NIU
recognizes the Genius Bus Controllers at Serial Bus Address 31 and 30. In
this mode, the NIU’s outputs are usually controlled by SBA 31. However, if
no outputs are received from SBA 31 for a period of three Genius bus
scans, the NIU’s outputs are immediately controlled by SBA 30. If outputs
are not available from either controller, the NIU’s outputs go to their
configured default or hold their last state. In Hot Standby mode, the
controller at SBA 31 always has priority control of the NIU’s outputs. In
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