A Review Of What Is Rs485 Cable

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 (). ) is set for communication protocol selection in initial shipment set- ting. ) in the communication protocol selection parameters. ) in the communication selection parameters. 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. The only way this would not work is if the secondary device only takes "write only to device" transmissions with no possibility of any acknowledgement or return result. S command is used and the slave inverters do not return the data. Set Bit 15 of Com- munication Command 1 (communication Number: FA00, FA04) to "1" (enable). Key Monitoring Procedure Set panel key selection (Communication Number: FA10) to "1" to set the external key mode. 8.3.2. Key utilization by communication The VF-AS1 can use the panel keys on the inverters through external communication.

Input by key operations can also be executed. 4.4. Broadcast communication function Broadcast communication function can transmit the command (write the data) to multiple inverters by one communication. 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 23 Host computer Block 1 Inverter No. 10 Inverter No.11 Inverter No.19 VF-AS1 VF-AS1 VF-AS1 In broadcast communication, only the representative inverter in each block returns data to the host computer. Command processing will be executed only broadcast communication "0" and with those inverters that match set inverter numbers. Only the write (W, P) command is valid and the read (R, G) command is in- valid. Adds "(" and "&" to the read data in. CRC values are generated by the transmission side that adds CRC to messages. If bit 0 through bit 6 of terminal board output data (FA50) are set with the computer, data specified (0 or 1) can be sent to any output ter- minal. To use this function, select functions 92 to 105 in advance for the output terminal function selection parameters f130 to f138, f168andf169.

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, what is rs485 cable functions can be assigned individually to the termi- nals on the input terminal board. Page 49 Terminal board output data (FA50) The output terminal board on each inverter can be directly controlled with the computer. Page 28 Ex. 4 A VisualBaisc program for the ASCII mode communication (VisualBaisc is the registered trademark of the U.S. Inverter numbers and checksum used in ASCII mode are omitted from these examples. 4.5. Examples of the use of communication commands Here are some examples of the use of communication commands provided for the VF-AS1 series of inverters. 9. Parameter data Explanation of parameters for VF-AS1 series is described here. Utilizing a series of dedicated interface devices, it allows PCs and industrial controllers to communicate.

8.3. Utilizing panel (LEDs and keys) by communication The VF-AS1 can display data that is not related to the inverters through an external controller or other means. Page 61 ■ ASCII LED display data code (00H-1FH are blank.) Hex Code Display Char. 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. The transmission format is basically the same to the case of binary mode. 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. In most higher level protocols, one of the nodes is defined as a master which sends queries or commands over the RS485 bus. Modbus TCP nomenclature is the same as for the Modbus over Serial line protocol, as any device which send out a Modbus command, is the 'client' and the response comes from a 'server'.