There are essentially 2 ways to read Analog inputs: reading current or reading voltage. Current is generally the most common because it can reach longer distances across the wire without losing analog input signal. Voltage, on the other-hand, will degrade over long distances producing inaccurate readings. When working with devices that only read 1-5V [...]
SCADACore uses several different forms of cellular communication for the SCADACore Live and Sentinel products. Unless you are very familiar with these products you probably do not know of their strengths and weaknesses. At SCADACore we deploy thousands of these modems so we have a good idea when to use and when to avoid [...]
CDMA Network End Of Life Cellular providers accross North America have standardized on the GSM network for a variety of reasons (http://www.pcmag.com/article2/0,2817,2407896,00.asp). As consumers we are left to find a solution to the end of life of the CDMA network. For the US this means that old hardware that used [...]
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 [...]
