HF scientific Micro200BW Turbidimeter - 0 -1000 NTU - Manual (Page 49)

Page 35
MICRO 200 BW 0 - 1000 NTU (5/05)
Rev. 3.1
These options may be used to connect to a serial printer,
a data logger or as a direct interface to a computer. The
serial port will report each reading that is seen on the
analyzer digital display. The report is in ASCII format
and is concluded with a carriage return and line feed.
As an example, if the display of the MICRO 200 BW
reads 0.1234 NTU, the serial port decimal string would
be:
Decimal
48 46 49 50 51 52 78 84 85
13 12
0 . 1 2 3 4 N T U (CR) (LF)
ASCII
(SP) = Space; (CR) = Carriage Return; (LF) = Line
Feed
If the display reads 098.7 % T, the serial port decimal
string would be:
Decimal
48 57 56 46
55 0 37 84 13 12
0 9 8 . 7 (SP) % T (CR) (LF)
ASCII
By selecting “Printer on” via the Main Menu, Utility
Menu and the COMM Port menu, the MICRO 200 BW
will transmit each reading, in real time. This mode is
used to drive a printer for raw data collection.
By selecting “Printer Off” the MICRO 200 BW will
only transmit its reading by command. Up to 16
MICRO 200 BW units may be simultaneously con-
nected to one serial port of a host computer. An address
may be assigned to a particular unit by operating F2 in
the Comm Port Menu. It will serially cycle through
addresses Ø through F (Hexadecimal). Obviously, no
two units, which are on the same host computer port,
should have the same address.
If the host computer transmits the ASCII character “@”
(decimal 64) followed by the ASCII character address,
for instance, 64, F, only the unit assigned address “F”
will respond with its reading. This allows data logging
for a non-dedicated host computer for up to 16 MICRO
200 BW units on only one of its serial ports. Both the
MICRO 200 BW and the host computer must be set at
the same baud rate. The host computer requires
software to handle the data storage.
1. RS-232C Standard Voltage Mode Interface
(Catalog # 19861)
This configuration is the standard serial port format
(RS-232C). It is suitable where the cable length
c. Analog Outputs
Analog outputs of either 4-20 mA or voltage are
available. If you select voltage you may choose 0-10V,
0-1V or 0-100mV. This analog output will be shared by
both modes and will automatically recalibrate to the
selected mode.
d. Serial Port (Optional)
If a serial port is connected the readings will report in
NTU while in the turbidity mode and will report in %T
while in the backwash mode.
2. OPERATION
With the remote switch set to the normal position
(open), the instrument should be calibrated in both
turbidity and backwash. All parameters such as alarm
set points and display limits should be set as described
in the O&M Manual. From the main menu, press F4 to
enter turbidity, and select the range. At any time, from
this point on, you may set the remote switch to the
backwash position (closed) and change over to the
backwash display.
While in either mode any operating parameter may be
changed by pressing MENU and entering the access
code. Keep in mind that even while in the menus, all
outputs are still active in which ever mode you were last
in.
CAUTION: Keep in mind that when changing modes,
the alarms, the analog output and the serial port
(if connected) will also change modes.
SERIAL INTERFACES
Each of these options maybe installed by removing the
rear cover of the analyzer as shown in figure 4 on page
8 and plugging in the interface as shown in figure 21.
Figure 15
Serial Interface Installation