# HACH SC1000 Modbus registers

**URL:** <https://forum.inductiveautomation.com/t/hach-sc1000-modbus-registers/6780>\
**Category:** General Discussion\
**Created:** [June 27, 2013, 12:59pm UTC](https://forum.inductiveautomation.com/t/hach-sc1000-modbus-registers/6780 "2013-06-27T12:59:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![DWeber](https://avatars.discourse-cdn.com/v4/letter/d/f07891/32.png) [@DWeber](https://forum.inductiveautomation.com/u/DWeber)\
**Post date:** [June 27, 2013, 12:59pm UTC](https://forum.inductiveautomation.com/t/hach-sc1000-modbus-registers/6780/1 "2013-06-27T12:59:29Z")

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I am trying to connect to a HACH SC1000 sensor using the Modbus driver. My OPC item path is [basin]2.HRF400004. The tag values show true but I am not receiving any data. Is my format incorrect. It is modbus address 2 and I am looking at a float value. The 400004 address is from the manual. Has anyone made this connection before?

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**Author:** ![hmatlock](https://avatars.discourse-cdn.com/v4/letter/h/aca169/32.png) [@hmatlock](https://forum.inductiveautomation.com/u/hmatlock)\
**Post date:** [June 27, 2013, 1:18pm UTC](https://forum.inductiveautomation.com/t/hach-sc1000-modbus-registers/6780/2 "2013-06-27T13:18:41Z")

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Your format looks correct besides the address. In this case the OPC item path would be [basin]2.HRF4 instead of 400004. The HRF indicates it is a 400000 or holding register.

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**Author:** ![DWeber](https://avatars.discourse-cdn.com/v4/letter/d/f07891/32.png) [@DWeber](https://forum.inductiveautomation.com/u/DWeber)\
**Post date:** [June 27, 2013, 1:21pm UTC](https://forum.inductiveautomation.com/t/hach-sc1000-modbus-registers/6780/3 "2013-06-27T13:21:20Z")

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That worked! Thank you for the fast response. You made my morning easy.