Instruction/ maintenance manual of the product RS-485 Siemens
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CC1A7865.1en 31.10.2002 Sie mens Bu ildi ng Tech nolo gies HVAC Product s 7 865.1 Interface RS-485 RWF40... The RS-485 interface is used f or integrati ng RW F40… controllers into data networks via MOD bus protocol.
2/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Transmission mode (RT U) The transmission mode used is the RTU (re mote terminal unit) mode. Data are trans- mitted in binary format (hexadecimal) with 8 bits. The LSB (least significant bit) is transmitted first.
3/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Communication se quence Both the start and end of a data block are c haracterized by transmiss ion pauses. The maximum period of tim e that m ay elapse between 2 successi ve characters is 3 times the period of time required for the transmis sion of one character.
4/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Data query sequence The time sequence of a data query looks as follows: Master Sl ave Data qu er y Rep ly Data qu ery t 0 t 1 t 0 t 2 7865z12e/1102 t0 Identification of end = 3 characters (time is dependent on the Baud rate) t1 This time is dependent on internal handling.
5/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Structure of the data blocks All data blocks use the same structure: Slave address Function c ode Data field Checksum CRC16 .
6/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Checksum (CRC16) The che cksum ( CRC1 6) is used to det ect tra nsmissio n err ors.
7/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Reading n words This function is used to read n words from a certain address.
8/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Writing n w ords Slave address Function 0x10 Address of first word Number of words Number of by t es (max.
9/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Address tables Address Data typ e Access Parameter Value range Default valu e 0x0000 f loat R / O Actual value E1 0x0002 f loat R / O Actual value E2 0x0004 f loat R / O Actual value E3 0x0006 f loat R / W Current setpoint 0x0008 f loat R / W SP1 First setpoint SPL.
10/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Address Data typ e Access Parameter Value range Default valu e 0x0300 word [13] R / O Device data 0x0300 char SW Version [1.
11/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Address Data type Access Parameter 0x0200 word R / O Outputs and states B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 .
12/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Description of operati ng modes Parameter «RemoteStatus» is used to switch between the operating modes «LOCAL», «REMOTE SETPOINT» and «FULLY REMOTE». The change is always accomplished via the MOD bus.
13/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 The previous functions of the RW F40... are maintained (apart from mem ory usage). The R W F40... can be parameterized and uploaded via the MOD bus, whereby the out- puts cannot be changed.
14/14 Siemens Building Technologie s CC1A7865.1e n HVAC Produ cts 31.10.2002 Modulating controller: The management system predefines the va lue (degree of modulat ion) for the analog output via «RY». Setting the «RK2» and «RK3» by the management system has no impact.
An important point after buying a device Siemens RS-485 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Siemens RS-485 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Siemens RS-485 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Siemens RS-485 you will learn all the available features of the product, as well as information on its operation. The information that you get Siemens RS-485 will certainly help you make a decision on the purchase.
If you already are a holder of Siemens RS-485, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Siemens RS-485.
However, one of the most important roles played by the user manual is to help in solving problems with Siemens RS-485. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Siemens RS-485 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
