# Polling tags Individually

**URL:** <https://forum.inductiveautomation.com/t/polling-tags-individually/36939>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [July 22, 2020, 10:45am UTC](https://forum.inductiveautomation.com/t/polling-tags-individually/36939 "2020-07-22T10:45:52Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![dhalpenn](https://avatars.discourse-cdn.com/v4/letter/d/439d5e/32.png) [@dhalpenn](https://forum.inductiveautomation.com/u/dhalpenn)\
**Post date:** [July 22, 2020, 10:45am UTC](https://forum.inductiveautomation.com/t/polling-tags-individually/36939/1 "2020-07-22T10:45:52Z")

</div>

Hi  
We are having an issue seeing tag state changes on a slave device. It has been suggested by the slave device owner that it is because we are polling multiple tags at once.  
Is it possible to poll tags individually? How can this be achieved?

Regards

---

<div class="post-metadata">

**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:** [July 22, 2020, 10:54am UTC](https://forum.inductiveautomation.com/t/polling-tags-individually/36939/2 "2020-07-22T10:54:27Z")

</div>

What driver? If a flavor of Modbus, turning off “span gaps” could help. And or reducing the maximum number of registers per request.

Also, just for my future (non-) purchasing file: what brand and model? Because that is a technically lame excuse.

---

<div class="post-metadata">

**Author:** ![dhalpenn](https://avatars.discourse-cdn.com/v4/letter/d/439d5e/32.png) [@dhalpenn](https://forum.inductiveautomation.com/u/dhalpenn)\
**Post date:** [July 22, 2020, 11:18am UTC](https://forum.inductiveautomation.com/t/polling-tags-individually/36939/3 "2020-07-22T11:18:01Z")

</div>

We are polling Modbus RTU (set as digital coil inputs on their end) from a struxureware automation server through our Moxa gateway. We are setup to read these points as digital inputs in the tag config.  
Span gaps is currently left unticked. We also have the following setup:

Max Holding Registers Per Request - 125  
Max Input Registers Per Request - 125  
Max Coils Per Request - 2000  
Max Discrete Inputs Per Request - 2000

Any other info would be appreciated.

---

<div class="post-metadata">

**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:** [July 22, 2020, 12:19pm UTC](https://forum.inductiveautomation.com/t/polling-tags-individually/36939/4 "2020-07-22T12:19:38Z")

</div>

> [@dhalpenn](#):
>
> polling Modbus RTU

Is there really a serial port in the data path? Does such a serious product not support Modbus TCP?

Regardless, for starters, cut all of the Max per Request values in half. Smaller packets on a serial line == less chance any specific packet is broken by noise.