HF scientific MicroTOL Online Turbidimeter - Manual (Page 33)

MICRO TOL (5/10) 27
Rev. 4.8
FLOW THROUGH
CUVETTE
ULTRASONIC
TRANSDUCER
SENSOR
(TOP VIEW)
ULTRASONIC
SPRING
CONNECTIONS
Figure 6: Operational parts of the Ultrasonic Cleaning System
8.3 RS-485 Outputs
The Micro TOL has the capability to operate in three different RS-485 modes for all
models. Included is a mode for interfacing into the HF Online software package (section
8.3.1 below), and a simple communication mode. A third operating mode is the Modbus
communications. All modes will automatically configure and do not require any changes
or selections.
8.3.1 HF Online (HF catalog # 19783)
The Micro TOL can operate as a small SCADA system with an optional PC software
package, called HF ONLINE. This system allows for an interface with up to 255 Micro
TOL’s for the purpose of data logging. This system will interface directly with common
database and spreadsheet software.
8.3.2 Simple Communication
The Micro TOL 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 can be changed in the Extended
CONFIG menus 7.14 RS-485 Parameters.
The master computer will send out:
• Byte #1 the attention character “:” in ASCII or 3A Hex
• Byte #2 the address of the Micro TOL being queried
• Byte #3 & 4 CR LF or 0D 0A in hex
The Micro TOL will respond with: