HF scientific AccUView Wastewater UV %Transmission Monitor - Manual (Page 31)

8.2.2 Simple Communication
The AccUView Wastewater can provide basic communications over simple programs
such as the Hilgraeve HyperTerminal that is included with most Microsoft Windows
packages. The user could also use Visual Basic or other programs. The default
communication parameters are 8 bits, no parity and 1 stop bit. These parameters may be
changed in the extended
CONFIG menu.
The master computer will send out:
• Byte #1 the attention character “:” in ASCII or 3A Hex
• Byte #2 the address of the AccUView Wastewater being queried
• Byte #3 & 4 CR LF or 0D 0A in hex
The AccUView Wastewater will respond with:
• The same attention character “:” in ASCII or 3A Hex
• The address of the AccUView Wastewater
• The Reading
• The Unit (% T )
A sample communication would look like this:
(Master computer requesting a report from address #1)
: 1 CRLF
(AccUView Wastewater set to address #1 Response)
:001 97.4 %T
8.2.3 Modbus Communication
Modbus communications is fully operational if the RS-485 option (Catalog #19851A) is
installed. The Modbus protocol communication information is covered in a separate
manual (Catalog #24570). This manual is available as a free download from our website at
www.hfscientific.com
8.3 Remote Panel Meter (Catalog # 19609)
The remote panel meter allows for remote indication of the %T reading using the 4-20 mA
loop. No external power is required as the meter is run off of the 4-20 mA source.
8.4 Heater Option – Model # 19571C
This factory installed option allows the AccUView Wastewater to be used at lower
temperatures where light freezes may occur. This option includes two 30W radiant heater
elements controlled by an adjustable thermostat. The use of this option extends the
operation of the AccUView Wastewater down to ambient temperatures of -10
°C. The
thermostat should be set to about 15
°C - 20°C to allow the heaters enough time to
compensate to dropping temperatures.
To prevent water from freezing in source and drain lines, solenoid valves close during
pumping and open to the atmosphere after pumping. This prevents water from being held
in the lines and thus prevents the lines from freezing up.
AccUView Wastewater (1/09) 25
Rev. 2.9