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

8.3.2 Simple Communication
The AccUView 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 being queried
• Byte #3 & 4 CR LF or 0D 0A in hex
The AccUView will respond with:
• The same attention character “:” in ASCII or 3A Hex
• The address of the AccUView
• The Reading
• The Unit (% T )
A sample communication would look like this:
(Master computer requesting a report from address #1) : 1 CRLF
(AccUView set to address #1 Response) :001 97.4 %T
8.3.3 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 .
8.4 Flow Alarm (Catalog # 19945A)
The flow switch for the AccUView is a factory-installed option. This option indicates a
“Low Flow” condition by switching both relays to the fail state and setting the 4-20 mA
signal to 2 mA. There is also a screen indication of the low flow condition and a modbus
register is set.
8.5 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.
AccUView (6/10)
Rev. 4.0 26