ECM BB100, Instruction Manual, Page: 16 / 37

CLR button. Pressing the SEL button will advance the programming to the “2.” function,
and then the “3.” function. Pressing the SEL button when at the “3.” function will bring the
meter out of programming mode. The meter will remember the programming even if its
power is turned off.
The BB100 can also be programmed via the RS-232 port using the supplied software
(BBREMOTE.EXE) or a user-written program that abides by the communication protocol
described in the Serial Port Programming Interface Description section of this manual.
Analog Output
The analog output range is 0.0 to 5.0 V for flowrate and 0.5 to 4.5 V for total flow.
For total flow, the analog output will start at 0.5 V when zero’d and ramp up to 4.5 V for the
total programmed volume. When the total volume exceeds the total programmed volume,
the voltage will jump back to 0.5 V and the display will start at zero again. The reason for
0.5 V and 4.5 V (instead of 0 and 5 V) is that data acquisition systems have their poorest
accuracy at the extremes of their ranges (ex. 0 and 5 V). The choice of 0.5 and 4.5 V assures
that the data acquisition system will be able to accurately detect the beginning and end of the
flow total.
For flowrate, the analog output range is 0.0 to 5.0 V. Since the meter will not normally be at
either extreme, this range is satisfactory for all data acquisition systems.
BBremote Serial Communication Software
The BB100 has a powerful serial communication capability that allows the user to remotely:
•
Display the volume flowrate or total flow volume in real-time
•
Change the mode of operation
•
Program the meter
•
Calibrate the meter
A DOS PC-compatible program (BBREMOTE.EXE) is supplied to demonstrate this
capability. BBremote may be run as a stand-alone DOS program or in a DOS window within
Windows 3.1, 95, or 98.
BBremote can graphically display the flow rate or total flow in real-time. It is possible to
have different operating modes for the BBremote display and the meter display. For
example, the BBremote graph could be displaying Liters Total while the meter is displaying
LPM.
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