# Modbus write command

**URL:** <http://discussions.gridprotectionalliance.org/t/modbus-write-command/919>\
**Category:** openHistorian\
**Created:** [June 25, 2021, 11:26am UTC](http://discussions.gridprotectionalliance.org/t/modbus-write-command/919 "2021-06-25T11:26:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![songoku](http://discussions.gridprotectionalliance.org/letter_avatar_proxy/v4/letter/s/f9ae1b/32.png) [@songoku](http://discussions.gridprotectionalliance.org/u/songoku)\
**Post date:** [June 25, 2021, 11:26am UTC](http://discussions.gridprotectionalliance.org/t/modbus-write-command/919/1 "2021-06-25T11:26:12Z")

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Hi all,

Have any API for Modbus write command in openHistorian?

Thank you!

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**Author:** ![ritchiecarroll](http://discussions.gridprotectionalliance.org/user_avatar/discussions.gridprotectionalliance.org/ritchiecarroll/32/2_2.png) [@ritchiecarroll](http://discussions.gridprotectionalliance.org/u/ritchiecarroll)\
**Post date:** [July 6, 2021, 8:43am UTC](http://discussions.gridprotectionalliance.org/t/modbus-write-command/919/2 "2021-07-06T08:43:53Z")

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The web-based Modbus configuration page allows “write” sequences as well “reads” so that you can “select” a desired context of registers.

Ritchie