YSI DIQ/S 182 XT-4-MOD - Manual (Page 121)

System 182 XT-4 Modbus connection
7 - 5 ba76028e01 02/2012
Note
To accept all settings, highlight the Save and quit menu item at the
lower end of the setting table and press
g
. If you exit the setting table
via
m
,
e
/Quit or the Quit menu item, all changes are ignored.
7.4 Transmitted sensor data
7.4.1 Overview
Data transmission is carried out via the RS 485 interface with the
Modbus RTU protocol.
Transmitted sensor data The following data for a sensor is transmitted to the Modbus master as
a consistent data block:
 Sensor number (Sxx)
 Sensor status
 Sensor model
 Status info of sensors
 Measuring mode
 Measured value status (main and secondary measured value)
 Main measured value
 Secondary measured value
Note
The transmitted data of all IQ S
ENSOR N ET sensors are available in the
YSI document, "IQ S ENSOR N ET sensors: Encoded data for field bus
communication" (ba76073e). It is regularly updated when new sensors
are introduced and when the sensor software is changed (if it concerns
the transmitted sensor data). The latest version is available on the
Internet.
Note
Check the transmitted data for agreement of the requested and
transmitted sensor number (Sxx) before any further processing.
Sensor data block The datasets of the sensors are made available to the Modbus master
in a sensor datablock in the DIQ/S 182 XT-4-MOD.