# Which one is right in "Primary and secondary client" **URL:** \ **Category:** Robot Communication\ **Created:** [March 3, 2020, 11:07pm UTC](https://forum.universal-robots.com/t/which-one-is-right-in-primary-and-secondary-client/6553 "2020-03-03T23:07:45Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![anon79053281](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@anon79053281](https://forum.universal-robots.com/u/anon79053281)\ **Post date:** [March 3, 2020, 11:07pm UTC](https://forum.universal-robots.com/t/which-one-is-right-in-primary-and-secondary-client/6553/1 "2020-03-03T23:07:45Z")
hi guys, There are many formats of data in “Client\_Interface\_V3.12andV5.6.xlsx” as following: ```auto 3.12: Primary and Secondary Client interface 3.11: Primary and Secondary Client interface 3.10: Primary and Secondary Client interface 3.7 -> 3.9: Primary and Secondary Client Interface 3.6: Primary and Secondary Client Interface 3.5: Primary and Secondary Client Interface 3.4: Primary and Secondary Client Interface 3.3: Primary and Secondary Client Interface 3.2: Primary and Secondary Client Interface 3.1: Primary and Secondary Client Interface 3.0: Primary and Secondary Client Interface ``` the question is some of them are a little bit different. So, I am so confused about choosing one of them. Is there a list showing the correspondence between the UR robot version and the data format? thanks for your reply! ---
**Author:** ![fujikit](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/fujikit/32/6042_2.png) [@fujikit](https://forum.universal-robots.com/u/fujikit)\ **Post date:** [March 3, 2020, 11:29pm UTC](https://forum.universal-robots.com/t/which-one-is-right-in-primary-and-secondary-client/6553/2 "2020-03-03T23:29:35Z")
If version of your robot is SW3.12, please select “3.12: Primary and Secondary Client interface” . I always update the newest version(SW3.12) of robot, so I select this.