Cable Line Length
The maximum possible data exchange speed between interface converters and digital modules via RS-485 and CAN 2.0 interface is determined by cable line length, cable resistance per unit length and amount of the digital modules installed.
In order to determine the speed of the connected RS-485 interface device, one can use the program for device detection in the measuring line RS – 485.
The program performs search of the RS-485 devices connected to the measuring line. As an installation wizard one can use any converter of USB-RS 485 type, which is connected to PC and which forms virtual COM-port in it. The program enacts the COM-port specified by the user and creates requests with various exchange speed values, parity bit types and MODBUS-devices addresses. Upon completion of each cycle the program depicts the amount of successful requests, which have been answered by the controlled device.