Altistart 22 - Schneider Electric

Modbus FunctionThe following paragraphs describes each supported function.Read Holding registersRequestFunction code 1 Byte 0x03Starting Address 2 Bytes 0x0000 to 0xFFFFQuantity of Registers 2 Bytes 1 to 63 (0x 3F)ResponseFunction code 1 Byte 0x03Byte count 1 Byte 2 x N*Register valueN* x 2 Bytes*N: Quantity of RegistersErrorError code 1 Byte 0x83Exception code 1 Byte 01 or 02 or 03 or 04 (see details onpage 72)ExampleNote: Hi = high order byte, Lo = low order byte.This function can be used to read all ATS22 words, both input words and output words.RequestSlaveno.03 No. of first word Number of words CRC16Hi Lo Hi Lo Lo Hi1 byte 1 byte 2 bytes 2 bytes 2 bytesResponseSlaveno.03 Number ofbytes readFirst word value ------- Last word value CRC16Hi Lo Hi Lo Lo Hi1 byte 1 byte 1 byte 2 bytes 2 bytes 2 bytesExample: read 2 words 'ACC and DEC at Modbus address 19 and 20 to W3105 (16#0013 to 16#0014) in slave 2, using function 3, where:• ACC - Acceleration = 10• DEC - Deceleration = 0Request 02 03 0019 0002 CRC16Response 02 03 04 000A 0000 CRC16Value of: W0019 W020Parameters: ACC DECBBV51330 08/2012 69