# Modbus connection parameters **URL:** \ **Category:** Technical Questions\ **Created:** [March 30, 2026, 10:03am UTC](https://forum.universal-robots.com/t/modbus-connection-parameters/42526 "2026-03-30T10:03:27Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![mnizamudeen](https://avatars.discourse-cdn.com/v4/letter/m/58f4c7/32.png) [@mnizamudeen](https://forum.universal-robots.com/u/mnizamudeen)\ **Post date:** [March 30, 2026, 10:03am UTC](https://forum.universal-robots.com/t/modbus-connection-parameters/42526/1 "2026-03-30T10:03:27Z")
I am trying to monitor the status of UR robots using ignition Scada over Modbus TCP: ![image](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/3/31bf556e1af2d41ea36ad38b2c7c35ec1b32981c.png) ![image](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/4/48361090d27d1d582cac8182e032672ee5a23c20.png) The connection seems to be unstable, switches between connected and Disconnected, I was wondering if its the settings like ‘Communication Timeout’, ‘Max Retry count etc causing this. Have anyone tried similar setup and what settings would be preferred? Thanks in advance. ---
**Author:** ![alex\_avila](https://avatars.discourse-cdn.com/v4/letter/a/e68b1a/32.png) [@alex\_avila](https://forum.universal-robots.com/u/alex_avila)\ **Post date:** [April 3, 2026, 1:46pm UTC](https://forum.universal-robots.com/t/modbus-connection-parameters/42526/2 "2026-04-03T13:46:03Z")
I am using ignition v 8.3.4 (and previously 8.3.3) to connect to a controller running polyscope X v 10.11.1. My modbus connection seems stable. I’m using almost all default settings in ignition. Here are the differences I see between my setting an yours: Communication time out: 2000 Max Holding Registers Per Write Request: 123 Span gaps: True Max retry count: 1 I have one switch between my robot and my server, which I am running off of my personal machine. Hope that helps.