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6
Modbus RTU
Instructions for Modbus-Protocol-Setup please see Application Note AN0103 (www.epluse.com/
EE355).
• The EE355 can be used in Modbus networks with max. 32 units.
• The bus termination shall be realized with 120 Ohm resistor (not included in the scope of supply)
• For proper function the power supply must be strong enough to ensure supply voltage within the speci-
fied range (see technical data) at any time and at all devices in the bus. This is particularly relevant when
using long and thin cables which can cause high voltage drop.
6.1
Data Transmission
Slave Adress
Baud Rate
Data Bits
Parity
Stop Bits
6.2
Modbus Map
The measured values are stored as a 32Bit float value. Depending on the measurement unit
selected, the measurements are saved in SI or US/GB units.
Register
Protocol-
Address
Read Registers (Function Code 0x03 / 0x04) / 32Bit float value
30026
0x19
30028
0x1B
30032
0x1F
30042
0x29
30060
0x3B
Read Registers (Function Code 0x03 / 0x04) / 16Bit integer value
30501
0x1F4
Write Registers (Function Code 0x06) / 16Bit integer value
60001
0x00
60002
0x01
Manual EE355 Dew point transmitter
Adjustable Values
1...247
9600 / 19200 / 38400
8
None / Even / Odd
1 / 2
Measuring Value
Temperature
Relative Humidity
Dew point temperature
Frost point temperature
volume concentration
State of auto-calibration
0 ... normal operation
1 ... auto-calibration active
Slave-ID
RS485 Data Transmission
Factory Setting
243
9600
8
Even
1
SI-Unit
°C
%
°C
°C
ppm
US/Gb-Unit
°F
%
°F
°F
ppm
11
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