# What is the difference between Modbus, Modbus Plus, and ModbusTCP/IP?

**URL:** <https://forumautomation.com/t/what-is-the-difference-between-modbus-modbus-plus-and-modbustcp-ip/278>\
**Category:** Industrial Networking\
**Created:** [February 26, 2015, 8:46am UTC](https://forumautomation.com/t/what-is-the-difference-between-modbus-modbus-plus-and-modbustcp-ip/278 "2015-02-26T08:46:12Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![instrumen](https://forumautomation.com/letter_avatar_proxy/v4/letter/i/65b543/32.png) [@instrumen](https://forumautomation.com/u/instrumen)\
**Post date:** [February 26, 2015, 8:46am UTC](https://forumautomation.com/t/what-is-the-difference-between-modbus-modbus-plus-and-modbustcp-ip/278/1 "2015-02-26T08:46:12Z")

</div>

What is the difference between Modbus, Modbus Plus, and ModbusTCP/IP?

---

<div class="post-metadata">

**Author:** ![omega](https://forumautomation.com/letter_avatar_proxy/v4/letter/o/a6a055/32.png) [@omega](https://forumautomation.com/u/omega)\
**Post date:** [February 26, 2015, 8:47am UTC](https://forumautomation.com/t/what-is-the-difference-between-modbus-modbus-plus-and-modbustcp-ip/278/2 "2015-02-26T08:47:03Z")

</div>

Modbus is a serial master/slave protocol. Modbus can run over any serial type media (copper, fiber, wireless, modem, etc…)

Modbus Plus is a peer-to-peer protocol which runs at 1 mbs. The Modbus Plus protocol specifies the software layer as well as the hardware layer. Proprietary cabling and terminators must be used with a Modbus Plus network.

ModbusTCP/IP is an EtherNet based protocol. ProSoft Technology’s ModbusTCP/IP products act in a master/slave capability.