# Honeywell UDC 3500, control, logging and sms

**URL:** <https://discourse.nodered.org/t/honeywell-udc-3500-control-logging-and-sms/13125>\
**Category:** Share Your Projects\
**Created:** [10 July 2019 19:03 UTC](https://discourse.nodered.org/t/honeywell-udc-3500-control-logging-and-sms/13125 "2019-07-10T19:03:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![netwingduck](https://avatars.discourse-cdn.com/v4/letter/n/9dc877/32.png) [@netwingduck](https://discourse.nodered.org/u/netwingduck)\
**Post date:** [10 July 2019 19:03 UTC](https://discourse.nodered.org/t/honeywell-udc-3500-control-logging-and-sms/13125/1 "2019-07-10T19:03:52Z")

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I made a flow that can communicate with 4 UDC's simultaneously, it does read writes to almost every register (FC20 not supported in contrib modbus), it logs to MySQL, it has a historian, and it uses Twilio to send alarms. I setup Open-VPN and put it on a 4g router and control it from my phone. This allows not only remote monitoring but remote-CONTROL. So any heat process I can remotely monitor and control, GREAT! People are afraid to touch it, too many security concerns. ☹ So now its my labor of love that I have to abandon or set-free. I have tested it in the field for over a year: it is solid. Ive been running more than one of them on beagleboneblacks and the platform is solid. I'll gladly post it here once uploads unlock so that others can learn from all the modbus nightmares and maybe even use it for their own system or find errors I missed. I know there is demand for such things and this is a really common temperature controller. I hope you all can use it or modify it to solve some other control/monitoring issues you may have with modbusTCP devices. Thanks.

Here is a drive link: [https://drive.google.com/file/d/1-9l\_keTZzQR9nCtsvS8fkyls9lw\_7vA-/view?usp=sharing](https://drive.google.com/file/d/1-9l_keTZzQR9nCtsvS8fkyls9lw_7vA-/view?usp=sharing)

I'll upload it directly here when my uploads unlock (just moved here from the google group).

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**Author:** ![Migs74](https://avatars.discourse-cdn.com/v4/letter/m/ce7236/32.png) [@Migs74](https://discourse.nodered.org/u/Migs74)\
**Post date:** [15 December 2021 10:08 UTC](https://discourse.nodered.org/t/honeywell-udc-3500-control-logging-and-sms/13125/2 "2021-12-15T10:08:42Z")

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Hi Netwingduck

Had a look at you project and i can see you have spent a lot of time on the flow,

Thanks for sharing

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**Author:** ![netwingduck](https://avatars.discourse-cdn.com/v4/letter/n/9dc877/32.png) [@netwingduck](https://discourse.nodered.org/u/netwingduck)\
**Post date:** [20 April 2022 15:41 UTC](https://discourse.nodered.org/t/honeywell-udc-3500-control-logging-and-sms/13125/3 "2022-04-20T15:41:26Z")

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Thanks man, been a while since I revisited this. Out of curiosity did you find any of it useful for your application? What did your application do?