# Modbus Driver question!

**URL:** <https://forum.inductiveautomation.com/t/modbus-driver-question/5918>\
**Category:** Ignition\
**Created:** [February 24, 2013, 12:12am UTC](https://forum.inductiveautomation.com/t/modbus-driver-question/5918 "2013-02-24T00:12:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Rv.Batista](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/rv.batista/32/3593_2.png) [@Rv.Batista](https://forum.inductiveautomation.com/u/Rv.Batista)\
**Post date:** [February 24, 2013, 12:12am UTC](https://forum.inductiveautomation.com/t/modbus-driver-question/5918/1 "2013-02-24T00:12:44Z")

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Hello everyone, this is my first post in Ignition forum!

I’m want to know how to use HRBCD32 designator!

I made a configuration with the following OPC Item Path:

[ConversorETH\_Serial]1.HRBCD321680

But when I sniff the communication frames I see the driver asking for E88Fh = 59535!!!

What is wrong?

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**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:** [February 24, 2013, 12:44am UTC](https://forum.inductiveautomation.com/t/modbus-driver-question/5918/2 "2013-02-24T00:44:56Z")

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[quote=“Rv.Batista”]Hello everyone, this is my first post in Ignition forum!

I’m want to know how to use HRBCD32 designator!

I made a configuration with the following OPC Item Path:

[ConversorETH\_Serial]1.HRBCD321680

But when I sniff the communication frames I see the driver asking for E88Fh = 59535!!!

What is wrong?[/quote]

I think the address type you’re looking for is “HRBCD\_32”. Try this and see if it’s what you expect:

```auto
[ConversorETH_Serial]1.HRBCD_321680
```

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<div class="post-metadata">

**Author:** ![Rv.Batista](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/rv.batista/32/3593_2.png) [@Rv.Batista](https://forum.inductiveautomation.com/u/Rv.Batista)\
**Post date:** [February 25, 2013, 3:42am UTC](https://forum.inductiveautomation.com/t/modbus-driver-question/5918/3 "2013-02-25T03:42:04Z")

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Thanks Kevin,

I have tried dot, undeline, slash, and other chars, but in wrong place: “HRBCD32\_1680”.

Now it works, I think that this session in the help needs a review to include this undeline!

Thank you again!

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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:** [February 25, 2013, 4:01pm UTC](https://forum.inductiveautomation.com/t/modbus-driver-question/5918/4 "2013-02-25T16:01:49Z")

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We’ll make sure to update the user manual. Sorry about that.