Thermo Scientific AquaSensors™ DataStick™ Modbus ...

3 Communications Parameter Configuration via Fieldbus
Communications parameter configuration involves setting the slave address, Baud rate, and parity of the
Modbus Adapter’s fieldbus port using a freely available tool such as ModScan32 from WinTECH
Software Design (http://www.win-tech.com/html/modscan32.htm).
NOTE: New communications settings for slave address, Baud rate, and parity do not take effect
until power to the Modbus Adapter is cycled!
3.1 Default Communications Parameters
The default communications parameters are:
• Slave address: 1
• Baud Rate: 19.2 kbps
• Data Bits: 8
• Stop Bits: 1
• Parity: Odd
These parameters are set at the factory unless custom parameters have been requested. If the parameters
are customized, the Modbus Adapter will be accompanied by a paper tag that indicates the custom
parameters.
3.2 Modbus Slave Address
Register Address: 43022
Default Value: 1
Supported Slave Values: 1 to 247
Units: N/A
This slave address specifies the station number of the DataStick on the Modbus network. It must be a
unique station number on the network and can be any value from 1 to 247. Read register 43022 to
obtain the current station number. Write to the same register to change it.
3.3 Modbus Baud Rate
Register Address: 43023
Default Value: 0 (19.2 kbps)
Supported Values: 1.2 kbps to 230.4 kbps
Units: kbps (kilobits per second)
The Baud rate specifies the speed at which data is transferred between the Modbus master and the
Modbus adapter. Read register 43023 to obtain the current Baud rate. Write to the same register to
change it using the integer value in the following table.
Thermo Scientific AquaSensors DataStick Modbus Communications User Guide 6