Installation guide

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www.cooperbussmann.com/BussmannWirelessResources
Cooper Bussmann BU-905U-L Wireless I/O Configuration Manual
Operation
The BU-905U-L family of modules includes both a transmitter (BU-905U-L-T) and a receiver (BU-905U-L-R). You can send signals from the
transmitter to the receiver;
The transmitter and receiver include a default function to work as a pair by sending signals from the transmitter to the receiver with the most
commonly used inputs of the transmitter being mapped to the outputs of the receiver. You can restore the default function at any time by “linking”
the receiver to the transmitter.
You can create more complex configurations using the BU-Config software.
For configuration both modules have an RS232 RJ-45 connector on the front panel for configuration that you can use in conjunction with the
serial configuration cable supplied by Cooper Bussmann.
Transmitter (BU-905U-L-T)
The transmitter monitors inputs for changes, and forwards information about the state of the inputs to other modules based on the mapping
configuration.
Mappings define when to send information about the inputs to remote modules. Mappings can be triggered by a change of value of one of the
inputs or after a specified time has elapsed since the last transmission of the information.
The transmitter provides:
• Physical inputs - the discrete, analog and thermocouple signals; and
• Virtual or internal inputs - - derived from the physical inputs (e.g., setpoint inputs and pulsed inputs).
Setpoint Status
Setpoint status “inputs” are derived from analog inputs using high and low threshold levels. Setpoint status turns “on” as the analog signal moves
below the low threshold and “off” above the high threshold. Between the low and high setpoints, the setpoint status remains unchanged.
A rotary switch on the front of the transmitter unit lets you select between ten sets of user-defined setpoint thresholds.
Pulsed Inputs
Pulsed inputs create “count” registers derived from the discrete inputs. The BU-905U-L-T counts the number of pulses on each pulsed input and
stores the count in a count register. Each time the discrete signal changes from off to on, the pulsed input register increments by one count.
The front panel LEDs indicate the state of the discrete inputs as well as the setpoint inputs.
The transmitter also controls two physical outputs:
• Setpoint output – that indicates the status of the virtual setpoint input; and
• Module OK output – that becomes active when the module’s system status indicates there are no problems in operation.
You can also configure the module to:
• Increase reliability – by sending messages multiple times. Cooper Bussmann testing indicates three times gives best reliability in most
systems); and
• Increase message distance – by including one or more repeater stations in the mapping.
When the module sends a message, the yellow LED on the front panel flashes.
3A1579Rev1.4