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 [...]
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 [...]
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 [...]
