Basler DECS-250 Instruction Manual
Also see for DECS-250: Instruction manualInstruction manualInstruction manual
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Contents
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Table 20. Supported Exception Response CodesCode Name Description01 Illegal Function The query Function/Subfunction Code is unsupported;query read of more than 125 registers; query preset ofmore than 100 registers.02 Illegal DataAddressA register referenced in the data block does not supportqueried read/write; query preset of a subset of a numericalregister group.03 Illegal Data Value A preset register data block contains an incorrect numberof bytes or one or more data values out of range.DECS-250 Modbus™ via EthernetModbus can communicate through Ethernet if the IP address of the DECS-250 is configured as describedin the Communications section of this manual.Detailed Message Query and Response for RTU Transmission ModeA detailed description of DECS-250 supported message queries and responses is provided in thefollowing paragraphs.Read Holding RegistersQueryThis query message requests a register or block of registers to be read. The data block contains thestarting register address and the quantity of registers to be read. A register address of N will read holdingregister N+1. If the query is a broadcast (device address = 0), no response message is returned.Device AddressFunction Code = 03 (hex)Starting Address HiStarting Address LoNo. of Registers HiNo. of Registers LoCRC Hi error checkCRC Lo error checkThe number of registers cannot exceed 125 without causing an error response with the exception codefor an illegal function.ResponseThe response message contains the data queried. The data block contains the block length in bytesfollowed by the data (one Data Hi byte and one Data Lo byte) for each requested register.Reading an unassigned holding register returns a value of zero.Device AddressFunction Code = 03 (hex)Byte CountData Hi (For each requested register, there is one Data Hi and one Data Lo.)Data Lo..Data HiData LoCRC Hi error checkCRC Lo error checkCALL US TODAY1-888-POWER-58REQUEST A QUOTEparts@genpowerusa.comSHOP ONLINEwww.genpowerusa.comCALL US TODAY1-888-POWER-58REQUEST A QUOTEparts@genpowerusa.comSHOP ONLINEwww.genpowerusa.com |
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