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4220 Flow Meter
Section 2 Programming
2-18
Programming for the conditions and values that determine the
operation of the 4-20 mA loop (or loops) is done in Programming
Step 2, following the entry of FLOW RATE AT MAXIMUM
HEAD.
Note
The information in the following section is provided for those
who can write their own software programs to process the data
transmitted from the Serial Output port. Special cables may be
required. Contact Teledyne Isco technical support for more
information.
Serial Output – Returning to the OPTIONAL OUTPUTS menu,
you will see the SERIAL OUTPUt option. This feature lets the
flow meter transmit the most recent values for all currently
enabled ports as ASCII text. You can then write a simple
program to retrieve this data periodically, or you can do it inter-
actively using a terminal program.
Command Line: (Use the INTERROGATOR connector.) The
lines of text contain the port values for each port that is turned
on. The DATA command will use a special command response
protocol. The following table provides the ASCII codes for port
types and standard units of measure.
Table 2-1 ASCII Output Codes
Code Parameter Units
DE Description String
ID Unit specific identifier Unsigned long
MO Model String
TI Time since 1900 Days
BV Battery Voltage Volts
LE Level Meters
LSI Level Signal Strength 0 - 100%
FL Flow Cubic meters per second
VO Volume Cubic meters
FV Forward volume Cubic meters
RV Reverse volume Cubic meters
SV Sampler Enabled Volume Cubic Meters
RA Rain (rolls over every 255 tips) Tips
CR Current day’s rain (tips since
midnight)
Tips
PR Previous day’s rain (tips since
midnight)
Tips
PH pH pH units
DO Dissolved Oxygen Milligrams per liter
TE Temperature Degrees Celsius
YPH YSI 600 pH pH units
YDO YSI Dissolved Oxygen Milligrams per liters