If you only want to read data via Modbus/TCP, you do not need an option. However to write data you will need the communication channel option (suffix code: /MC).
Related Products & Solutions
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Modular GM10
For industrial and lab applications, the GM10 offers Bluetooth wireless connection and modular I/O that offers accurate and reliable measurements. The GM10 also supports 920 MHz band wireless communication.
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Touch Screen GP10/GP20
- SMARTDAC+TM GP10/GP20 Yokogawa Data Logger
 - Paperless recorder
 - Intuitive, human-centric design
 - Web-enabled functionality
 - Scalable architecture
 
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Touch Screen GX10/GX20
- SMARTDAC+ Touch Screen GX10/GX20
 - Multi-point touch screen recorder
 - Intuitive design
 - Web functionality
 - Scalable
 - GX20 supports 920 MHz band wireless