There are two separate representations of the Roclink “registers” called TLPs (Type/Logical/Parameter). They can be viewed as either Text such as AIN A1, EU – Analog Input, A1, EU value, or they can be viewed as the more commonly used numeric format 3,0,14. The Roclink Protocol Manual will use the [...]
When interfacing with remote devices via cellular modems the cell modem essentially acts as a serial bridge. From your computer over the internet to the Internet to the remote device. Sierra Wireless modems (http://www.sierrawireless.com/productsandservices/AirLink_Gateways_Modems/Intelligent_gateways.aspx) are some of the best in the industry but can be a little complex if you [...]
Most SCADA Integrators and users of modbus are familiar with the X0001 format for modbus registers, However, the true modbus standard is not simply one number it is a function code + register number. Specific devices treat the function codes differently on the front-end. The back end will interpret the 40000 registers [...]
Microhard Corp makes some of the best M2M products on the planet. Configuring your modem for serial pass through is relatively easy and straight-forward. SCADACore offers Microhard modems as an option for the Cellular Communication Packages. The modems that we will cover for setting up serial pass through are: Bullet-3G – Low [...]
When developing software interfaces to serial devices the first step is always to get the device talking. With so many variables it can be incredibly frustrating when the application you are building does not properly communicate with the serial device. One particular application I had was interfacing with a Questemp [...]
Calculating Daylight hours by latitude is essential for properly sizing a battery box and solar panel. There are several other factors that play significant roles in calculating power needed, however, it was difficult to find a simple formula for calculating daylight hours by latitude. The c# code is provided by [...]
The following blog will help give programmers a simple formula for average wind direction and speed. Here is an excel sheet with all averaging examples First a disclaimer: I am not a mathematician. The idea behind this blog is not to teach math it is simply to give the formula [...]
Finding the correct Endian (bit significance) can be frustrating when trying to interface with a device. It’s an additional variable that makes debugging a hardware interface more difficult and can lead to unwanted and sometimes unseen errors. Hex Results When you read hex characters it is generally straight forward 0x01 = [...]
After dealing with some problems with a process control feedback loop or proportional-integral-derivative controller (PID) I thought it would be helpful for other people going through the same problems. We had highly fluctuating pressure so using a Back Pressure Control Valve we set up a feedback look that reading the [...]
SCADACore has released version 1.1 of AGA Gas Flow Calc For Windows. The new release features a flow report generator that allows users to input specific test information and save or print the AGA Flow Calculation Report.The new version is available here: AGA Flow Calc For Windows
