# Potential Firmware Incompatibilities

**URL:** <https://forum.deltamotion.com/t/potential-firmware-incompatibilities/427>\
**Category:** Knowledge Base: Troubleshooting\
**Created:** [August 21, 2017, 10:47pm UTC](https://forum.deltamotion.com/t/potential-firmware-incompatibilities/427 "2017-08-21T22:47:03Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jacob\_Paso](https://forum.deltamotion.com/letter_avatar_proxy/v4/letter/j/439d5e/32.png) [@Jacob\_Paso](https://forum.deltamotion.com/u/Jacob_Paso)\
**Post date:** [August 21, 2017, 10:47pm UTC](https://forum.deltamotion.com/t/potential-firmware-incompatibilities/427/1 "2017-08-21T22:47:03Z")

</div>

There are potential incompatibilities to be aware of if updating RMC firmware in the following situations:

IF the current RMC70/150 firmware version is older than 3.63.0,

AND either of the following is true:

- RMCLink is communicating with the RMC
- An older Allen-Bradley 1756-ENBT or 1756-EN2T module is communicating with the RMC

THEN, keep reading, otherwise, there are no known incompatibilities.

The following incompatibilities may arise when updating to the most recent firmware:

1. As of RMC70/150 firmware 3.63.0 (February 2016), a new “Encapsulation Inactivity Timeout” parameter was added. This is a new EtherNet/IP requirement, and must default to closing an inactive TCP/IP connection used by EtherNet/IP after 2 minutes. This feature can be disabled from RMCTools in order to retain pre-3.63.0 behavior. There are two known incompatibilities:

2. As of RMC70/150 firmware 3.41.0 (April 2011), new “Quality of Service (QoS)” values are used to meet the strong recommendation of the EtherNet/IP specification. This feature can be disabled from RMCTools in order to retain pre-3.41.0 behavior. There is one known incompatibility:

3. These new QoS values are not supported by older Allen-Bradley Ethernet bridge modules. See the “Troubleshooting EtherNet/IP I/O” topic in RMCTools documentation for exact products affected and firmware revisions. The suggested solution is to upgrade the firmware in the Allen-Bradley Ethernet bridge modules, but this feature can also be turned off in the RMC using RMCTools.