ENDA EDP141 DIGITAL POTANTIOMETER
Contents
1. efesotomasyon com ENDA EDP141 DIGITAL POTANTIOMETER MODBUS ADDRESS MAP 1 1 Memory map for Holding Registers Holding Register addresses Data type Data content Parameter Read Write l typ Name mission Decimal Hex PENSO User option menu access code 0 Invisible os Byt peer O00t 1 Modification can be done 2 or 3 Only visible UO SL eee ene Device option menu access code 0 Invisible 00024 0002h 1 Modification can be done 2 or 3 Only visible d o SL Readable Writable Calibration menu access code 0 Invisible rc oe oe 1 Modification can be done 2 or 3 Only visible Readable Writable Control parameter when first energized oer cee O of F 1 on 2 5 5tr See user manual for detailed information Readable Writable Sess eg ee coe mene ecied ine nisog He eee ee ee erat renal fr aeelee ivormation dt ft cee ie emer eee jae a i a 200bps 2 2400bps 3 4800bps o ee o 1 2 Memory map for Discrete input Discrete input Data type Data content oe 0000 h 0002 h 0003 h Bit State of external upwards button 0 OFF 1 ON Only Readable 0004 h State of external downwards button 0 OFF 1 ON poe Only Readable 2 MODBUS ERROR MESSAGE Modbus protocol has two types error communication error and operating error Reason of the communication error is data corruption in transmission Parity and CRC control should be done to prevent communication error Receiver side checks parity and2. CRC of the data If they are wrong the message will be ignored If format of the data is true but function doesn t perform for any reason operating error occurs Slave realizes error and sends error message Most significant bit of function is changed 1 to indicate error in error message by slave Error code is sent in data section Master realizes error type via this message Modbus Error Codes When the data which is required becomes outside of address map of slave this error code is sent When the data which is sent is outside the boundary of modbus Wrong data value protocol this error code is sent Structure of command message Byte Format Structure of response message Byte Format Message example Device Address Device Address Function Code Function Code Beginning address Error Code of coils CRC DATA Number of coils N CRC DATA As you see in command message coil information of 4A1 h 1185 is required but there isn t any coil with 1185 address Therefore number 02 error code wrong data address sends 1 1 EDP141 MODBUS E 01
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