Hach 1735 TRO Manuel D'utilisation page 15

Option
DATA ORDER
PARITY
STOP BITS
SET DEFAULTS
MODBUS STATS
CLEAR STATS
Change the display contrast
1. Go to GENERAL SETUP>DISPLAY CONTRAST.
2. Use the ARROW keys to adjust the display contrast.
Remote operation
About remote operation
The instrument can be operated remotely with the RS485 Modbus connection. Instruments that are
installed in hazardous locations can be operated from a safe area through an RS485 interface. Only
configuration and maintenance items found in the instrument setup menu are available for remote
operation.
Modbus commands are sent from the ballast water control system by the RS485 connection. With
remote operation the user can:
• Monitor instrument operation
• Configure the instrument
• Put the instrument in run or standby
• Restart the instrument
• Put the instrument in standby mode to clean the colorimeter or change reagents
For more information, refer to the ballast water control system documentation for the vessel.
Monitor the instrument remotely
The manufacturer recommends that the ballast water control system be configured to monitor the
parameters in Table 2.
Parameter
Measurement
Status
Reagent balance hours
Reagent balance volume
Warnings
Errors
Main meas sec remaining Monitors the time duration until the next measurement update
For more information, refer to the ballast water control system documentation for the vessel.
Description
Select Little Endian (default) or Big Endian.
Set to no (default), even or odd parity.
Select 1 (default) or 2.
Set the Modbus back to factory default values.
Show errors and good counts.
Set the Modbus count stats to zero.
Table 2 Remote parameters
Description
Show mg/L as chlorine; show mg/L as bromine
Run or standby mode
Approximate number of operation hours until reagent replacement
Approximate amount of reagent available in mg/L
Registers 40074 to 40077; alerts the user to a specific condition but does not stop
operation
Registers 40078 to 40083; a severe condition that will stop the operation of the
instrument
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