CLX-XT (28652) Page 25
REV 5 (5/2020)
8.0 Additional Features and Options
8.1 RS-485 Outputs
The CLX-XT has the capability to operate in two different RS-485 modes. Included are a
simple communication mode and Modbus communications. Both modes will
automatically configure and do not require any changes or selections
8.1.1 Simple Communication
The CLX-XT 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 factory
setting communication parameters are 8 bits, no parity and 1 stop bit. These can be
changed in the Extended CONFIG menus 7.10 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 CLX-XT being queried
• Byte #3 & 4 CR LF or 0D 0A in hex
The CLX-XT will respond with:
The CLX-XT will respond with:
• The same attention character “:” in ASCII or 3A Hex
• The address of the CLX-XT
• The Reading
• The Unit (mg/L)
A sample communication would look like this:
(Master computer requesting a report from address #1) :1 CRLF
(CLXB set to address #1 Response) :001 0.0249mg/L
8.1.2 Modbus Communication
Modbus protocol communication is included with this instrument. The Modbus
address list is available from HF scientific or online at www.hfscientiifc.com.
8.2 Remote Panel Meter (Catalog # 19609)
The remote panel meter allows for remote indication of the mg/L reading using the 4-20
mA loop of the CLX-XT. No external power is required, as the meter is run off of the 4-20
mA source of the CLX-XT.
8.3 Desiccant Cartridge Option (Catalog #09944)
An optional desiccant cartridge kit can be purchased for use in applications where
condensation on the glass cuvette may compromise accuracy. The desiccant changes color
from blue to pink when expended. Instructions for replacement are included with the kit.
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