# Ignition Modbus Master/Slave

**URL:** <https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474>\
**Category:** Ignition\
**Tags:** modbus, vision\
**Created:** [October 15, 2025, 3:12pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474 "2025-10-15T15:12:32Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![derek.stoddard](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@derek.stoddard](https://forum.inductiveautomation.com/u/derek.stoddard)\
**Post date:** [October 15, 2025, 3:12pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474/1 "2025-10-15T15:12:32Z")

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I have been unable to find a definitive answer in the documentation–am I correct in saying Ignition must act as the master in a Modbus configuration?

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**Author:** ![ryan.white](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ryan.white/32/73193_2.png) [@ryan.white](https://forum.inductiveautomation.com/u/ryan.white)\
**Post date:** [October 15, 2025, 3:21pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474/2 "2025-10-15T15:21:14Z")

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Correct, base Ignition only supports connecting as a Master modbus device.

However, some third party modules, like Automation Professional's [Advanced Modbus Driver](https://forum.inductiveautomation.com/t/automation-professionals-advanced-modbus-driver/41312), allow you to configure Ignition as a Modbus server device or a Modbus Master device, while also adding additional helpful functionality.

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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:** [October 15, 2025, 3:31pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474/3 "2025-10-15T15:31:12Z")

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I’ve also got a Modbus server driver and it’s free / open source.

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**Author:** ![derek.stoddard](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@derek.stoddard](https://forum.inductiveautomation.com/u/derek.stoddard)\
**Post date:** [October 15, 2025, 3:34pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474/4 "2025-10-15T15:34:11Z")

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Awesome, is there a download link available anywhere?

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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:** [October 15, 2025, 3:47pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474/5 "2025-10-15T15:47:08Z")

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> **[Release v1.0.0 · kevinherron/modbus-server-driver](https://github.com/kevinherron/modbus-server-driver/releases/tag/v1.0.0)**
>
> Initial release, v1.0.0

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**Author:** ![David\_Stone](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/david_stone/32/79749_2.png) [@David\_Stone](https://forum.inductiveautomation.com/u/David_Stone)\
**Post date:** [October 15, 2025, 7:44pm UTC](https://forum.inductiveautomation.com/t/ignition-modbus-master-slave/111474/6 "2025-10-15T19:44:06Z")

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Missed that one for the free modules wiki, fixed now.