User Manual EE431
Duct and Immersion Temperature Sensor | 15
5.4.5. Modbus RTU Protocol Settings
Factory settings
User selectable values
(via EE-PCS / Modbus protocol)
Baud rate
As per type number ordered
9 600, 19 200, 38 400
Data bits
8
8
Parity
Even
None, odd, even
Stop bits
1
1, 2
Modbus address
66
1...247
Tab. 6
Modbus RTU protocol settings
PLEASE NOTE
The recommended settings for multiple devices in a Modbus RTU network are 9 600, 8, even, 1.
Device address, baud rate, parity and stop bits can be set via:
▪
EE-PCS Product Configuration Software and the USB configuration adapter HA011066.
The EE-PCS10 can be downloaded free of charge from
.
▪
Modbus protocol in the register 1 (0x00) and 2 (0x01).
See Application Note Modbus AN0103 (available at
).
The measured values are saved as 32 bit float value (FLOAT32) and 16 bit signed integer (INT16). The factory
setting for the Modbus address is 66 as an INT16 value. This address can be changed by the user in the register
1 (0x00), permitted values are 1...247.
The serial number as ASCII-code is located in read-only registers 1 - 8 (0x00 - 0x07, 16 bits per register).
The firmware version is located in register 9 (0x08) (bit 15...8 = major release; bit 7...0 = minor release). The
sensor name as ASCII-code is located in read-only registers 10 - 17 (0x09 - 0x11, 16 bits per register).
NOTICE
When reading the serial number or the sensor name, it is always necessary to read all 8 registers, even if the
desired information requires less.
NOTICE
For obtaining the correct floating point values, both registers have to be read within the same reading
cycle. The measured value can change between two Modbus requests, exponent and mantissa may get
inconsistent then.
