Series 2000 Communications Handbook - Soliton

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MODBUS and JBUS ProtocolSeries 2000 Communications Handbook3.18. DIAGNOSTIC LOOPBACK(WPEVKQP EQFG J6JKU HWPEVKQP RTQXKFGU C OGCPU QH VGUVKPI VJG EQOOWPKECVKQPU NKPM D[ OGCPU QH C HNQQRDCEMIQRGTCVKQP 6JG FCVC UGPV VQ VJG KPUVTWOGPV KU TGVWTPGF WPEJCPIGF 1PN[ FKCIPQUVKE EQFG HTQO VJG )QWNF /QFKEQP 5RGEKHKECVKQP KU UWRRQTVGF%QOOCPFDevice addressFunction CodeDiagnostic CodeLoopback DataCRC0800001 byte 1 byte MSB LSB MSB LSB MSB LSB4GRN[6JG TGRN[ VQ HWPEVKQP KU VJG UCOG CU VJG EQOOCPF'ZCORNG 2GTHQTO C NQQRDCEM HTQO VJG 5GTKGU KPUVTWOGPV CV CFFTGUU WUKPIC FCVC XCNWG QH J%QOOCPFDevice addressFunction CodeDiagnostic CodeLoopback DataCRC08000002 08 00 00 12 34 ED 4F4GRN[Device addressFunction CodeDiagnostic CodeLoopback DataCRC08000002 08 00 00 12 34 ED 4F3-24 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00
Series 2000 Communications HandbookMODBUS and JBUS Protocol3.19. WRITE N WORDSFunction code:16, (10h)Command:DeviceaddressFunctioncode10Address offirst wordNumber ofwords to writeNumber of databytes (n)DataCRC1 byte 1 byte MSB LSB MSB LSB 1 byte n bytes MSB LSBThe maximum number of words that can be transmitted isSeries 2200: 32Series 2400: 125 words, which corresponds to 250 bytes of dataThe first two bytes are data with the required value of the first parameter, MSB first.Following pairs of bytes are data for the consecutive parameter addresses.A device address 00 will broadcast the data to all devices on the network.NB: Blocks of data written using Modbus function 16 containing values in positionscorresponding to the addresses of unconfigured parameters are not generally rejected,although the values of any unconfigured parameters are discarded. This allows relativelylarge blocks of parameter data to be written in a single operation, even if the block containsa little ‘empty’ space. This is particularly useful for operations such as downloadingramp/dwell programs, recipes, or instrument cloning. However this also leads to a potentialpitfall: if the block of data contains only a single parameter, and the destination addressrefers to an unconfigured or unused Modbus address, the write operation will appear to besuccessful, although the instrument will have discarded the value. See also Chapter 6 -‘ignoring Modbus errors’.Attempts to write to read only parameters over Modbus, even when they are embedded withina block of data, will be rejected with a Modbus ‘data error’. Any subsequent values in theblock will also be discarded.Reply: There will be no reply to a command broadcast to the device address 00. See thesection on ‘Error Response’ below for details of the reply if the operation fails.Device addressFunction code10Address offirst wordNumber of wordswrittenCRC1 byte 1 byte MSB LSB MSB LSB MSB LSBSeries 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00 3-25
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Series 2000 Communications Handbook - Soliton

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