CRC values are generated by the transmission side that adds CRC to messages. The receiving side regenerates CRC of received messages and compares generation results of CRC regeneration with CRC values actually received. 5.2. CRC Generation "CRC" is a system to check errors in communication frames during data transmission. With regard to compatibility, however, VF-A7 users should check the items described be- low before using the communication function of their inverters. To provide consistency in communication procedures, the communication function of the VF-AS1 series of inverters has been designed based on the protocols used for the Toshiba VF-A7 series of inverters. This article discusses the difference between RS232 and RS485 serial communication protocols. The primary serial channel can operate at standard speeds up to 19200 baud and can be configured for either RS232 (the default) or RS485 operation. We need to test the operation of a computer Belden cable RS485 for one of our clients. Page 49 Terminal board output data (FA50) The output terminal board on each inverter can be directly controlled with the computer.

Page 52 Output terminal board status (FD07, FE07) Output terminal board status (current status): "Communication Number FD07" Output terminal board status (status immediately before the occurrence of a trip): "Communication Number FE07" Using terminal function selection parameters, functions can be assigned individually to the termi- nals on the output terminal board. Page 51 Input terminal board status (FD06, FE06) Input terminal board status (current status): "Communication Number FD06" Input terminal board status (status immediately before the occurrence of a trip): "Communication Number FE06" Using terminal function selection parameters, functions can be assigned individually to the termi- nals on the input terminal board. Page 60 Block Communication Function for LED Display To display LED data for ASCII display that is synchronized to each digit, set data for each digit and validate this set data by display selection by communication (Communication Number FA65). Page 61 ■ ASCII LED display data code (00H-1FH are blank.) Hex Code Display Char. These Parameters are read-only (monitor-only) parameters. ) in the communication protocol selection parameters. Page 37 Setting example of parameters (2-wire RS485 communication) Parameters relating to the master side (example)  Master (transmission of output frequency (%) (100% at FH))  Selection of communication protocol (Toshiba inverter protocol) Communication baud rate  (ex.

When using 2-wire type, short RXB to TXB and RXA to TXA. The setting of a parameter was When using the TOSHIBA Inverter Protocol, use the W command to changed, but it returns to its write data into the EEPROM. For communication purposes, see the parameter list on inverter's instruction manual regarding the communication number, adjustment range and so forth. See "8.1 Command by communication" for the method to enable them. Command processing will be executed only broadcast communication "0" and with those inverters that match set inverter numbers. Page 64 Command parameters For those parameters that contain data only in the RAM and not in the EEPROM, their data return to initial values when the power is turned off, in failure resetting, or when standard shipment settings are set. Some cables are designed so that the impedance is relatively independent of distance. The transmission speed of RS485 cables can vary depending on factors such as cable length, baud rate, and the quality of the cable itself.

The condition is that the communication wire is high-quality and meets the standard, the baud rate is 9600, and only one 485 device is loaded, so that the communication distance can reach 1200 meters, so the actual and stable communication distance of the 485 bus is usually less than 1200 meters. That is, a bus is used to connect each node in series, and ring or star networks are not supported. According to the 485 bus structure theory, under the premise of an ideal environment, the 485 bus transmission distance can reach 1200 meters. The RS232 (Recommended Standard 232) and RS2485 (Recommended Standard 485) are simple forms of serial communication protocols used to transmit and receive data. The two jacks are wired in parallel by circuit traces on the circuit board. So, in the Oder to overcome all the disadvantages of parallel communication, serial communication has been implemented. The data can be transmitted via serial or parallel, the main advantage of parallel communication is that the data can be transferred very fast and the disadvantages are cost per bit will be high and also the crosstalk between the wires will represent that there may be a greater chance of data corruption when transferring long distances.

For those who have any issues concerning where as well as how to utilize what is rs485 cable, it is possible to call us on our web page.