PA7300 Instruction Manual - TECO-Westinghouse Motor Company

(18) Inverter station address (Sn-23)(19) RS-485 Communication protocol setting (Sn-24)The 7300PA inverter has two RS-485 communication option card PA-M (MODBUSprotocol) and PA-P (PROFIBUS protocol). These two option cards can be used formonitoring inverter status, reading the parameter setting, and changing theparameter setting to control the inverter operation.Parameter definition is as follows:Sn-23Inverter station address, setting range 1~31.Sn-24= Communication parity setting00No parity01Even parity10Odd parity11Not usedCommunication baud rate setting002400 bps (bit/sec)014800 bps109600 bps1119200 bpsEvery data has a data length of II bits: 1 start_bit, 8 data_bits , 1 parity_bit and 1stop_bit. If communication parity setting as no parity (Sn-24=XX00), the parity_bit is1.3 different commands are used for communication between the inverter and externalunits:a. Read Command external units to read the memory address of the inverter.b. Write command external units to write the memory address of the inverter in orderto control the inverter.c. Circuit test command: To test the communication status between the inverter andexternal units.The change of setting Sn-23, Sn-24 will be effective in the next start time afterturning off the inverter.Forbid the DRIVE/PRGM change while writing through RS-485.For more details of RS-485 communication refer to7300PA RS-485 MODBUSCommunication Application Manualor7300PA RS-485 PROFIBUS CommunicationApplication Manual.101