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Tech 20141120-1-0
Installation of the Mk5 iBMU with the RS-485
Adapter
Summary
As of December 2014, NDSL has introduced a new iBMU model (Mk5) into the field. While this unit
is functionally the same as previous versions of the iBMU, there have been several hardware
improvements and changes that affect how installers will connect the RS-485 adapter. This
document will explain how RS-485 connectivity is achieved with the Mk5 iBMU.
Note: The RS-485
adapter wiring itself has not changed.
Instructions for the Mk5 iBMU
The new Mk5 iBMU is no longer equipped with a dedicated VSCOM card for communication to the
Control Unit(s). RS-485 communications are now handled through the serial ports located directly on
the motherboard of the iBMU. Connect the RS-485 adapter to the serial port indicated below.
Note: Do not use the lower COM port that is covered with a dust cap. This port will not
communicate with Cellwatch.
Legacy iBMUs
The RS-485 adapter is connected to the uncovered COM port on the right side of the dedicated
VSCOM card, as shown below.
Note: Depending on the age of the iBMU, the VSCOM card may
be located to the left of the power supply.