Siemens RS-485 User Manual

CC1A7865.1en31.10.2002Siemens Building TechnologiesHVAC Products7865.1Interface RS-485RWF40...The RS-485 interface is used for integrating RWF40… cont

10/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Address DatatypeAccess Parameter Value range Defaultvalue0x0300 word [13] R / O

11/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Address Data type Access Parameter0x0200 word R / O Outputs and statesB15 B14 B

12/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Description of operating modesParameter «RemoteStatus» is used to switch betwee

13/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002The previous functions of the RWF40... are maintained (apart from memory usage)

14/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Modulating controller:The management system predefines the value (degree of mod

2/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Transmission mode (RTU)The transmission mode used is the RTU (remote terminal un

3/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Communication sequenceBoth the start and end of a data block are characterized b

4/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Data query sequenceThe time sequence of a data query looks as follows:MasterSlav

5/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Structure of the data blocksAll data blocks use the same structure:Slave address

6/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Checksum (CRC16)The checksum (CRC16) is used to detect transmission errors.If th

7/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Reading n wordsThis function is used to read n words from a certain address.Slav

8/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Writing n wordsSlaveaddressFunction0x10Addressof firstwordNumber ofwordsNumber o

9/14Siemens Building Technologies CC1A7865.1enHVAC Products 31.10.2002Address tablesAddress DatatypeAccess Parameter Value range Defaultvalue0x0000 fl