TDS-100M Manual
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get lost, even when both the power supply and the backup battery are removed.
（
2
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The zero point, that is the indicated flow under the situation of motionless liquid, has a great influence
over the linearity and accuracy of the flow meter. Users should try every possibility to perform the Zero
Setup that is located at Menu 42. Zero setup should always been performed under the condition of
motionless liquids. If Zero setup was been performed with motion of the liquid, you can use Menu 43 to
restore to the original zero point. The zero point will be stored in the RAM memory temporally when you
use Menu 42. If you want to solidify the zero point, you need to perform Menu 26 “make default paras”
function again. If this step was omitted, the system will override the RAM zero point by restoring the zero
point that is stored in the flash memory with next power-on.
（
3
）
The internal calendar is the base of date accumulators. Incorrect date and time will cause messy
records with the date accumulators. Please the user check the calendar by input correct date and time. The
calendar runs relying on the backup battery when there is no 24VDC supply. When the battery voltage is
less than 2 volts, a new backup battery should be replaced with. Replacing the battery with a new one
should be performed with the 24VDC applied so that the accumulator data and calendar data will not get
lost.
（
4
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Please pay great attention to the power supply. The applied voltage should be in the range of +15V to
24VDC, or 15V to 20VAC. Avoid applying a 110VAC or 220VAC power forever, or the module will be
damaged.
（
5
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Pay attention to the display located on Menu 48, which shows the points of lines for the linearity
correction function. 0 stands for shutting off the function. The default value is 0. Try to make sure that
value is 0 so as to avoid abnormal flow.
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6
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The latest calibrated data which are produced by performing the analog input or output calibration are
store in the RAM memory temporally. Users need to perform the M26 function to make these data be
solidified.
（
7
）
Use Menu 49 to check if there are inputs from the RS232 port with network application. If not, please
check protocol selection software switch located at Menu 63 and the serial port parameters options located
at Menu62. Select option 1 at Menu 63 for the MOSBUS RTU application. Select option 0 for MODBUS
ASCII and FUJI extended and Simple Water Meter protocols.
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8
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By a flash of the LED indicator for every 2 seconds, TDS-100M means the meter work properly. A
short flash for every second indicates no-signal or poor signal condition and a long flash for every second
shows the meter is performing a receiving gain adjusting.
2. Introduction to TDS-100M
(1) Development introduction
The TDS-100M is a compact, high performance general purpose ultrasonic flow meter module. The
design of the meter is intended to provide for users like system integrators and OEM users with a lowest
cost but of high performance flow meter. The development of the meter is based on a widely used flow
meter made by this company. The meter uses only one high performance MSP430 series microprocessor
made by Taxes Instruments.
This module can work alone without a LCD and Keypad module. The parameters that the flow meter
needed to work properly can be (1) setup by a parallel keypad module witch will be plugged onto the
parallel interface inside of the module, or by a serial keypad module witch will be plugged onto the
