# Modbus TCP format issue

**URL:** <https://forum.inductiveautomation.com/t/modbus-tcp-format-issue/84958>\
**Category:** Ignition\
**Tags:** ignition81, perspective\
**Created:** [January 30, 2024, 3:15pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-format-issue/84958 "2024-01-30T15:15:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![FLO](https://avatars.discourse-cdn.com/v4/letter/f/b38774/32.png) [@FLO](https://forum.inductiveautomation.com/u/FLO)\
**Post date:** [January 30, 2024, 3:15pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-format-issue/84958/1 "2024-01-30T15:15:07Z")

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Hello everyone,  
I have a problem with reading the modbus register of an Elster EK220 volume converter. I have configured it as a Modbus TCP device, I have identified the registers I am interested in reading HR 327 and 329, I have tried with Modbus Poll software and I read them correctly, when I enter them in ignition I no longer read them. It says in the device manual that the registers are 2 Float 32BIT. I have done all possible tests but to no success.

 ![elster](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/a/5a5455d7da224776852e5cf964ec23024f83abcd.jpeg)  
 ![mbpool](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/0/60bfc0987217ffd8d9efe4d631d21864d369928d.jpeg)

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**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 30, 2024, 3:32pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-format-issue/84958/2 "2024-01-30T15:32:08Z")

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> [@Florin\_Parva](#):
>
> I have done all possible tests but to no success.

Have you check all combinations of "zero-based addressing" and "swap words" in the IA driver? (Advanced settings.)

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [January 30, 2024, 3:46pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp-format-issue/84958/3 "2024-01-30T15:46:21Z")

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I'd expect an address like this to work, possibly with Swap Words enabled in the driver settings: `[DeviceName]1.HRF327`