HF scientific CLX Online Residual Chlorine Monitor (Old) - Manual (Page 23)

The instrument is equipped with an RS 485 port which operates in Simple bus, a
proprietary communication (for HF Online) or Modbus. Prompts will appear for setting
the baud rate, the address and the Modbus transmission mode (RTU or ASCII).
Select the correct baud rate (1200, 2400, 4800, 9600, or 19200) for operation of the I/O
port by pressing the S or T buttons to change the displayed baud rate.
Press the  button to continue on and select the desired instrument address using the S or
T buttons. Once the selection is satisfactory, press the  button.
To use the Modbus mode, select ASCII or RTU. Refer to the Modbus Manual available
from HF scientific inc. or online at
www.hfscientific.com .
7.4 Configuring the Alarms
Two relays are provided that are designed to operate as two independent programmable
alarms or as a system problem alarm. Please note that changes to alarms will not be
recognized until the start of the next cycle. Two settings must be selected to fully program
each alarm:
1. The alarm function (HI, LO, OFF or Error)
2. The alarm set point (level at which the alarm activates)
These items are described below:
Alarm Function: The alarms can either be turned OFF or selected to operate in one of
three different manners:
1. HI alarm: the relay changes state when the measured chlorine level is higher than the
programmed alarm level (set point).
2. LO alarm: the relay changes state when the measured chlorine level is lower than the
CLX (9/07) Page 17
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