# Modbus Data Reading and conversion **URL:** \ **Category:** Ignition\ **Tags:** modbus\ **Created:** [January 2, 2026, 4:41pm UTC](https://forum.inductiveautomation.com/t/modbus-data-reading-and-conversion/113052 "2026-01-02T16:41:19Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Adam\_Feigum](https://avatars.discourse-cdn.com/v4/letter/a/7bcc69/32.png) [@Adam\_Feigum](https://forum.inductiveautomation.com/u/Adam_Feigum)\ **Post date:** [January 2, 2026, 4:41pm UTC](https://forum.inductiveautomation.com/t/modbus-data-reading-and-conversion/113052/1 "2026-01-02T16:41:19Z")
I’m trying to collect data off of some modbus devices i can see the data in Modscan and the correct Holding Registers but can not seem to get the mapping correct in ignition what am i doing wrong here ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/2/324ba3f8d61c08031da85f0c4c48711bafc21c17.png) I also have tried mapping the opc tag in multiple other formats and trying 0 based and 1 based addressing [CTE6115]HRF130 and [CTE6115]HRF131 ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [January 2, 2026, 4:56pm UTC](https://forum.inductiveautomation.com/t/modbus-data-reading-and-conversion/113052/2 "2026-01-02T16:56:33Z")
Your Modscan shows Device ID 1, while Ignition's addresses default to 0. Try `[CTE6115]1.HRF130` ---
**Author:** ![Adam\_Feigum](https://avatars.discourse-cdn.com/v4/letter/a/7bcc69/32.png) [@Adam\_Feigum](https://forum.inductiveautomation.com/u/Adam_Feigum)\ **Post date:** [January 2, 2026, 4:56pm UTC](https://forum.inductiveautomation.com/t/modbus-data-reading-and-conversion/113052/3 "2026-01-02T16:56:46Z")
I think i found it needed to reverse the word order in the device configuration