Resources & Tools

How to Get & Post RESTFul Requests

Videos - 3/27/2018

How to Get & Post RESTFul Requests using groov and Snap Pac.

How to Get Started with MQTT

Videos - 9/11/2018

In this tutorial you will learn how to get started using MQTT with Node-RED. The IoT is all about interconnecting devices. MQTT is a lightweight publish-subscribe based protocol that relays data through...more

Intro to Node-RED: Part 2 - Best Practices

Videos - 2/15/2018

Learn key best practices for Node-RED flow such as how to regularly backup your flows, maximize Node-RED features and debug your programs to ensure repeatable results and maintenance.

Secure way to download PAC Project

We have EPIC connected to our company network. It is obvious that, anyone from our company who knows IP address of EPIC, and who has PAC Control Software can modify/download a strategy. I see this as...more

Hello Opto Users! We are running into an implementation problem and could use some ideas. Here is what we need to do: We have an asphalt plant that might dispense product to 20 different companies who...more

OptoNews Tech Tip: Get sunrise/sunset times

Our tech tip this week comes from Philip in the OptoForum, who shared his PAC Control subroutine code for determining the time the sun rises and sets at a specific latitude. You could use HTTP requests...more

Log in and out of Groov and Groov Updates

Where can I find a list of updates for groov? I want to see what has all changed/updated since my current revision. I have a client that is using 3 groov boxes to monitor 3 sites. They are very pleased...more

More to learn at OptoU

New lessons on PAC Control just added to Opto 22's free online training program. Now more than ever, online training and communication tools have become the key to success in today's world. With COVID-19...more

Create / Update certificates when IP changes

Just a note for anyone who might come across this issue. After the initial EPIC-PR1 setup, it will create security certificates. If you are using them with one or more PR1 and I assume Groov-AR1...more

Paragon users? Here's a TTB (Truth Table) block example (chart v. OptoScript example)

Hi All, Sometimes we hear from people who are using Opto 22 hardware with another company’s software, including long-gone Paragon. The other day we had someone ask about their “TTB” and how that might...more

Log Viewer Feature

Hi,I have a potential client who asks me about the user’s access records to the groov view. I have seen that they are registered in the Log Viewer section under the gear icon, and my question is as...more

Scan time explained - old forum post

peterservo Joined on 03-10-2007 Posts 2 SNAP PAC R1/2 Application Performance? My background is in providing controls for Industrial Automation, particularly Machine Tools and Automated Assembly...more

Communication SNAP-SCM-232

Dear all, We like to communicate with a new device by using a SNAP-SCM-232 module, this is complete new for us and there for I look for some help in how to configure and how to set up the communication...more

An IIoT Standard To Rule Them All!

Who doesn't love a good Internet standard? I remember when I first got started in the technology world, reading RFCs was a great way to put myself to sleep at night. But during the day, they did help...more

Restrict users from PAC Display?

I know that I have had this discussion directly with you guys in the past. Of course, I can not find reference to it at this point! We have a client who is actively modifying our Display code which...more

Profibus DP Help!

I’m sure I’m probably in the minority when it comes to OTPO and Profibus protocol, but we recently received a third party analyzer with Profibus communication. This is my first time trying to use OPTO...more

Meet the newest members of the OptoPartner program

We're starting the new year by welcoming 8 new automation and integration companies to the OptoPartner program. We've introduced several new OptoPartner integrators this past year, and that list...more

How to set the clock on a PAC Controller

What time is it? Do you know what time it is? Does your SNAP PAC controller know what time it is? Are they the same time? Who’s right? In this week's blog we are going to talk about this big ball of...more

Link in email to open groov View mobile app

Hello All, This may be more of a feature request than an issue but here goes… I have an app where I am generating notifications that are being delivered via email. Most of the users who receive these...more

Wireshark + OptoMMP Dissector

Attention all serious bit-heads who get deep into our OptoMMP (memory-map protocol) – that’s what we use to communicate (either via TCP or UDP) to our PAC brains and controllers. Good news! Wireshark...more

Weekly and monthly data tables

I have started to log my water use at home. We installed a 1 pulse per gallon water meter, the output I have put to my EMU. (Yeah, it shows up as Kw in the EMU Sensor Manger software, but I don’t use...more

Another HTTP Web page scrape: of a Campbell Scientific CR1000 Datalogger

Hi All, Recently helped a customer who needed a screen scrape of their little CR1000 datalogger (by Campbell Scientific). I found a ton of them out on the Internet logging all sorts of data (lots of...more

Installing and Configuring PostgreSQL on groov EPIC

“PostgreSQL is a powerful, open source object-relational database system with over 30 years of active development that has earned it a strong reputation for reliability, feature robustness, and...more

EPIC and RIO Used CPU and Memory - Example Flow

We have a flow to show you how much free disk space you have; Flow to get free diskspace from EPIC or RIO Node-RED EDIT. It seems that not every EPIC drive number is the...more

PAC Display Vertical Label Range Max Value must be an integer?

I’m just full of questions tonight, it seems. We often have process variables whose full-scale ends up being less than 1. Examples are chlorine concentrations or turbidities in drinking water. In PAC...more

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