# TCP Driver write back documentation

**URL:** <https://forum.inductiveautomation.com/t/tcp-driver-write-back-documentation/21166>\
**Category:** Ignition\
**Created:** [November 30, 2018, 7:24pm UTC](https://forum.inductiveautomation.com/t/tcp-driver-write-back-documentation/21166 "2018-11-30T19:24:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![messinm](https://avatars.discourse-cdn.com/v4/letter/m/f08c70/32.png) [@messinm](https://forum.inductiveautomation.com/u/messinm)\
**Post date:** [November 30, 2018, 7:24pm UTC](https://forum.inductiveautomation.com/t/tcp-driver-write-back-documentation/21166/1 "2018-11-30T19:24:23Z")

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I found two pages of documentation that seem to conflict with regard to the TCP driver write back capability.

[https://docs.inductiveautomation.com/display/DOC/UDP+and+TCP+Drivers+Module](https://docs.inductiveautomation.com/display/DOC/UDP+and+TCP+Drivers+Module)

says the TCP driver can write back to the connected port.

[https://docs.inductiveautomation.com/display/DOC/UDP+and+TCP+Driver](https://docs.inductiveautomation.com/display/DOC/UDP+and+TCP+Driver)

says that both UDP and TCP drivers are strictly passive listeners.

Is one of these out of date?

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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:** [November 30, 2018, 7:27pm UTC](https://forum.inductiveautomation.com/t/tcp-driver-write-back-documentation/21166/2 "2018-11-30T19:27:58Z")

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One of those is a little out of date or misleading.

The TCP driver also exposes a tag that, when written to, will write the data out over the TCP connection.