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예식일 : The Anthony Robins Information To What Is Rs485 Cable
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9600 baud, even parity, 8-bit length, 1 stop bit --- Specifies the communication number for monitoring the output frequency. Key Monitoring Procedure Set panel key selection (Communication Number: FA10) to "1" to set the external key mode. 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). Set Bit 15 of Com- munication Command 1 (communication Number: FA00, FA04) to "1" (enable). 8.1. Communication commands (commands from the computer) Communication command (Communication number: FA00, FA04) Commands can be executed on inverter frequencies and operation stop through communication. ＊ : Note that the Communication Number for operation panel operation frequency is FA02 in the VF-S7 and VF-S9 series. Page 65 ＊ : Enable the communication command or communication frequency setting before setting these parameters are set. MODBUS-RTU decides the data that is first received subsequently as the first byte of a frame after a blank time for 3.5 bytes at the on-going communication speed. 5.1. MODBUS-RTU transmission format MODBUS-RTU sends and receives binary data without a frame-synchronizing start code and de- fines the blank time to recognize the start of a frame.

6.2. Transmission format for inter-drive communication Data type is handled in hexadecimal notation and the transmission characters are treated with the binary (HEX) code. Page 61 ■ ASCII LED display data code (00H-1FH are blank.) Hex Code Display Char. Inverter numbers and checksum used in ASCII mode are omitted from these examples. Page 28 Ex. 4 A VisualBaisc program for the ASCII mode communication (VisualBaisc is the registered trademark of the U.S. ) is set for communication protocol selection in initial shipment set- ting. ) in the communication protocol selection parameters. ) in the communication selection parameters. When enabling the communication command by Communication Command 1, commands by communication can be given the priority irrespective of the setting of the command mode selection parameter (). 5.2. CRC Generation "CRC" is a system to check errors in communication frames during data transmission. 4.3. Transmission errors Table of error codes Error name Impossible to exe- The command is impossible to execute, though communication was cute established normally.

Longer branches could cause signal reflections and generate disturbances and consequent errors in the reception of data. The main cable must be no longer than 700 m! The branches must be no longer than 1200 m! The cable shield must be earthed only in one point. If more than one slave tried to drive the transmit line simultaneously, their serial drivers would fight with each other for control of the bus. Up to 32-nodes (drivers and receivers) are allowed on one multi-drop, bi-directional network. 4.4. Broadcast communication function Broadcast communication function can transmit the command (write the data) to multiple inverters by one communication. Synchronization can also be achieved by batch writing LED data parameters after changing the fol- lowing block communication mode parameters and by sending data by block communication. Appendix 2 Response time The communication response time can be calculated from data communication time and inverter processing time. For communication purposes, see the parameter list on inverter's instruction manual regarding the communication number, adjustment range and so forth.

Each time an attempt to write data is made the inverter checks whether the data falls within the specified range. Different kinds of peripherals and motherboards require a different kind of cables, but all these falls under one major classification: SATA cables. With galvanic isolation the damage is generally limited to only one leg of the network, except in extreme cases of very high voltage (induced by lightening for example). 8. Commands and monitoring from the computer Across the network, instructions (commands and frequency) can be sent to each inverter and the operating status of each inverter can be monitored. Use this function for the following case: When the data response from the inverter is too quick after the PC had sent the data to the inverter, PC process cannot get ready to receive the data, or when the USB/RS485, RS485/RS232C con- verter is used, changeover of sending and receiving data takes much time in the converter process. The receiving side regenerates CRC of received messages and compares generation results of CRC regeneration with CRC values actually received. CRC values are generated by the transmission side that adds CRC to messages. CRC is composed of two bytes and has hexadecimal-bit binary values.

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