# Limits of RTDE Clients **URL:** \ **Category:** URCap Development\ **Created:** [January 3, 2020, 9:43am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970 "2020-01-03T09:43:02Z")\ **Posts on this page:** 10\ **Page:** 1
**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:** [January 3, 2020, 9:43am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/1 "2020-01-03T09:43:02Z")
How many limits of RTDE Clients to accessing port 30004? When I tried third clients, their connections were success. But fourth accessing was failure. T.Fujiki ---
**Author:** ![m.nagel](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/m.nagel/32/2326_2.png) [@m.nagel](https://forum.universal-robots.com/u/m.nagel)\ **Post date:** [January 3, 2020, 1:26pm UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/2 "2020-01-03T13:26:56Z")
Did you test the behavior on a real robot and/or ursim? In ursim (5.6) I could connect with 5 devices and InstallationNode. On a real robot I can do a test next week. Mike ---
**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:** [January 3, 2020, 1:29pm UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/3 "2020-01-03T13:29:48Z")
Thank you for replying. I tried on ursim SW3.10.0 I use CB series. ---
**Author:** ![m.nagel](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/m.nagel/32/2326_2.png) [@m.nagel](https://forum.universal-robots.com/u/m.nagel)\ **Post date:** [January 3, 2020, 4:13pm UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/4 "2020-01-03T16:13:50Z")
on CB ursim 3.12 I could connect via InstallationNode and 4 times with the example: record.py Currently we dont have access to a real robot of CB-series ---
**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:** [January 4, 2020, 5:03am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/5 "2020-01-04T05:03:50Z")
Thank you very much. I will try the real robot next week too.(UR3) ---
**Author:** ![malacasse](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/malacasse/32/56_2.png) [@malacasse](https://forum.universal-robots.com/u/malacasse)\ **Post date:** [January 6, 2020, 1:32am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/6 "2020-01-06T01:32:00Z")
This is from the release note of Polyscope 5.5 and 3.11 **Extended RTDE client limit** Allowing twice the amount of RTDE/fieldbus clients, six in total, which allow interfacing with more devices simultaneously. Enables users to pursue more advanced applications. So with ursim 3.10 their is only 3 RTDE client available. ---
**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:** [January 6, 2020, 4:18am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/7 "2020-01-06T04:18:31Z")
Thank you for replying. The firmware was updated to SW3.12 and I verified on URSim and Real Robot(UR3). The result is below: on URSim(SW3.12): limit is 3 on Real Robot(SW3.12) without Ethernet/IP : limit is 6 on Real Robot(SW3.12) with Ethernet/IP : limit is 5 Host Computer:192.168.2.101 Real Robot:192.168.2.11 The below image is with Ethernet/IP and it is indicated that limit is 5. ![図1](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/3/31430fdd45b1fe0490f8ea922b84f1b9e742c0b8.jpeg) ---
**Author:** ![anon75712119](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@anon75712119](https://forum.universal-robots.com/u/anon75712119)\ **Post date:** [October 8, 2021, 5:07am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/8 "2021-10-08T05:07:21Z")
Hey @fujikit How you get the values you required from RTDE in java. ---
**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:** [October 8, 2021, 11:50am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/9 "2021-10-08T11:50:41Z")
Which kind of variables? ---
**Author:** ![anon75712119](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@anon75712119](https://forum.universal-robots.com/u/anon75712119)\ **Post date:** [October 8, 2021, 11:51am UTC](https://forum.universal-robots.com/t/limits-of-rtde-clients/5970/10 "2021-10-08T11:51:34Z")
Like DigitalIO,Joint Values