YSI DIQ/S 182-MOD System 182 - Manual (Page 117)

System 182 Modbus connection
7 - 5 ba76025e01 02/2012
Note
To accept all settings, you have to 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 is given in the YSI
document, "IQ S ENSOR N ET Sensors: Encoded Data for Fieldbus
Communication" (ba76073e). It is permanently updated when new
sensors are available and when the sensor software is modified (if the
modifications are relevant for 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-MOD.