Xylem CL500 ONLINE CHLORINE ANALYZERS - Manual (Page 25)

CL500 (2/08) Page 21
REV 2.0
8.0 Additional Features and Options
8.1 Backlit LCD
The backlit LCD allows for easier readability of the LCD display in low light or no light
conditions. The backlight is intended for continuous operation. The brightness is
adjustable from a menu in the CONFIG mode.
8.2 RS-485 Outputs
The CL500 has the capability to operate in three different RS-485 modes. Included is a
mode for interfacing into the online software package (section 8.2.1 below), a simple
communication mode and Modbus communications. All modes will automatically
configure and do not require any changes or selections
8.2.1 Online SCADA(Catalog # 19783GW)
The CL500 can operate as a small SCADA system with an optional PC software
package. This system allows for an interface with a combination of TB500’s or
CL500’s, totaling up to 255 units, for the purpose of data logging. This system will
interface directly with common database and spreadsheet software.
8.2.2 Simple Communication
The CL500 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 7.9 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 CL500 being queried
•
Byte #3 & 4 CR LF or 0D 0A in hex
The CL500 will respond with:
•
The same attention character “:” in ASCII or 3A Hex
•
The address of the CL500
•
The Reading
•
The Unit (mg/L)
A sample communication would look like this:
(Master computer requesting a report from address #1) :1 CRLF
(CL500 set to address #1 Response) :001 0.0249mg/L