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Sometimes you can read from some register that has a known value. Adds "(" and "&" to the read data in. Only the write (W, P) command is valid and the read (R, G) command is in- valid. Page 19 P (50 (RAM write) This command is used to rewrite data into the parameter specified using a communication number. "Parameter Name  and , Communication Number. Prevents an increase in the number of digits. 9600 baud, even parity, 8-bit length, 1 stop bit --- Specifies the communication number for monitoring the output frequency. It does not specify or recommend any communications protocol; Other standards define the protocols for communication over an RS-485 link. RS-485 standard conformant drivers provide a differential output of a minimum 1.5 V across a 54-Ω load, whereas standard conformant receivers detect a differential input down to 200 mV. Up to 32-nodes (drivers and receivers) are allowed on one multi-drop, bi-directional network. Pre-coded device drivers configure the SPI for a standard data format, and routines defined in this chapter make it easy to customize a data format and baud rate for your application. Since both channels can operate simultaneously and independently, debugging can be performed while the application program is communicating via its primary channel.

A current transformer suitable for the application must therefore be selected. Any required SPI output signals must be configured as outputs by setting the appropriate bits in the Port D data direction register which is named PORTD.DIRECTION in the QED-Forth kernel. Max Master determines the biggest address that must be searched for. The master and slave can then exchange data. 4.4. Broadcast communication function Broadcast communication function can transmit the command (write the data) to multiple inverters by one communication. For detail, see "7. Communication parameters ". It cannot be used to write data into any read-only parameters. Page 16 Inverter → Computer At time of broadcast communication of the binary mode, returning of data is not executed except for the inverter to be returned (inverter number 00H) and when the inverter number is not matched. ) in the communication protocol selection parameters. ) is set for communication protocol selection in initial shipment set- ting. ) is set for initial communication protocol selection of shipment setting.

Command processing will be executed only broadcast communication "0" and with those inverters that match set inverter numbers. Page 10 • Data returned when data is not processed normally (ASCII mode) In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type num- ber is returned to the computer in addition to the checksum. Page 13 2) Error Processing (Binary mode) In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type num- ber is returned to the computer in addition to the checksum. Page 17 2) Error Processing (Binary mode) In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type num- ber is returned to the computer in addition to the checksum. To select a protocol, the communication protocol selection parameter f807 or f829 is used. 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'. You might also consider operating the secondary serial port at a lower baud rate to relax the timing constraints.

EIA-485 (formerly RS-485 or RS485) is an OSI Model physical layer electrical specification of a two-wire, half-duplex, multipoint serial connection. RS-485 is a robust and versatile communication standard that is widely used in industrial applications. RS-485 signals are used in a wide range of computer and automation systems. With careful design, many peripherals can communicate via the SPI, and powerful multi-processor systems can be linked using this high speed bus. When using the TOSHIBA inverter protocol and the data does not need to be records, use P command (the data is written only to RAM). RS-485, like RS-422, can be made full-duplex by using four wires. You aren’t limited to fifty feet of cable like with RS232. For example, at 115k baud your cable should not be much longer than 2500 feet. The only possible reference is the reading of the displayed value, for example, of the current. There are many possible configurations of master/slave networks. CRC values are generated by the transmission side that adds CRC to messages.

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