User Manual of EM730 Series Inverter Fig. 4- 22 Schematic Diagram of Normal and Exceptional Data Frames 11.4.2 Data frame processing Upon receiving a frame data, the system will first perform preprocessing to determine whether it is a legal frame sent to this machine and check whether the data is correct, followed by final processing. If the received frame is not legal, the data will not be sent back. If the received frame is legal but incorrect, the corresponding exceptional message frame will be sent back. requirements. Legal frame: Meet the address (local or broadcast) and length (not less than 3) Correct frame: It is a legal frame with a correct memory address.
The memory content is within the defined range and can be processed at present. 11.4.3 Response delay from the reception of valid data frame [7] (data in the RS-485 network, different from the The response delay (depending on the function code F10.04) is defined as the time interval command sent by the keyboard) to data parsing and return. Since the starting and ending 391 4800 8 4 The idle level of 3ms or less is allowed for a normal frame. When the idle level is 8ms or greater, it indicates the end of a frame of data. 9600 4 2 The idle level of 1ms or less is allowed for a normal frame. When the idle level is 4ms or greater, it indicates the end of a frame of data.
19200 2 1 The idle level of less than 1ms is allowed for a normal frame. When the idle level is 2ms or greater, it indicates the end of a frame of data. Higher 1 1 When an idle level of 1ms appears, it indicates the end of a frame.