Modbus ® Start-Up Kit; Establish Connection To The Computer; Modbus ® Tool - WIKA GD-20 Series Operating Instructions Manual

5. Commissioning, operation
The Modbus protocol is a single-master protocol. This master controls the entire data
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transfer and monitors any possible timeouts (no reply from the addressed instrument). The
connected instruments may only send telegrams after request by means of the master.
Modbus RTU (RTU: Remote Terminal Unit) transmits the data in binary form, guarante-
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eing a good data throughput.
Detailed information on the protocol under www.Modbus.org
5.4 Modbus start-up kit
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The gas density sensor, with the optionally available start-up kit (order no. 14075896),
can be configured for operation at the measuring location.
A further function is an integrated data logger, showing measured data in a specific
cycle or writing it in a file.
The start-up kit consists of:
Power supply unit
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Interface converter (RS-485 to USB)
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USB cable type A to type B
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Sensor cable with M12 x 1 connector
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Adapter cable for GDM-100-TI
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Modbus tool
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5.4.1 Establish connection to the computer

Interface converter
RS-485
5.4.2 Modbus tool
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The software can be downloaded free of charge from the WIKA homepage: https://
de-de.wika.de/download_software_gas_density_sensors_de_de.WIKA
WIKA operating instructions gas density sensor, model GD-20
USB
Voltage supply
+
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EN
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