#Serial communication protocol code
#Serial communication protocol series
#Serial communication protocol download

Note 4: The default value of stthe ation number for PLC is all 1. Note 3: Data column in some commands may not exist, and checksum will impose on previous 1~3 columns. Note 2: Format of sending and receiving methe ssage are the same. When the receiving side receives the ETX code, it means the data transmission terminated and starts to process command or data.

#Serial communication protocol code

The EXT code of either command or response is all ETX.

End code (ETX): The hexadecimal code of EXT code of ASCII is 03H.

The calculation of LRthe C method is to add all the hexadecimal value (8 bits length) of ASCII code and ignore to carry the number to keep the check value at 8 bits length. If the two check values are different, there are some errors that happened. When the two check values are the same, it means the data transferred correctly. This message will be checked with the same way at the receiving side when the message is received.

Checksum: Checksum checks the hexadecimal value of ASCII code in the previous 1~4 columns and produces one checksum value in one byte length (two hexadecimal value 00~FF) with “LRC” (Longitudinal Redundancy Check) method.

When erthe ror happens, it will be the error code instead of 0 (30H) and it will not follow the data information. In normal conditions (no error happened), the error code must be 0 (30H) in the beginning and then follow the responding status or value in the response message. The beginning of this data information contains the error code in the response message. The data in this column is to assign the address or value for reading or writing.

Data information: The data information contains 0 (no data) ~500 ASCII character.

For example, to read or write the status of discrete, force setting, run, stop… The command number which is received from mathe ster is also included in response message when slave sends the response message. It is the action which the master wants the slave to execute.

Command code: The command number is two numbers of hexadecimal systems.

when it send rethe sponse message to mathe ster. is 0, it means the master can send cothe mmand to all slaves) When the master wants to send cothe mmand to one or all (Station number =0) it accords the station number assignment. Every slave station has the only number from 1~FEH. There is only maa ster station and are 255 slave stations in the PLC communication frame. The station number of slave: The station numbers are hexadecimal two-number value.The receiving site can determine the data start code with STX. The start characters are all STX in command and response message. Start code (STX): The hexadecimal code of the STX in ASCII code is 02H.

There are 6 data columns in the FATEK PLC communication format including command (master) and response (slave) message. All the peripheral devices send the message when they communicate with FATEK PLC and it responds when receiving the message from masters.ģ-2 The Communication Message Format of FATEK PLC The first step of establishing an exact communication is the exact wiring, for the project we’ve considered, the old popular RS232 (2-2, 3-3, 5-5) is the thing answered properly (look below the picture).įATEK PLC is defined as slaves in the communication with peripheral devices that are always defined as masters when communicate with FATEK PLC. OOP programming and using an accurate implementation in real-time hardware dependant is something I've done once in DeltaDTB PID Controller.

#Serial communication protocol download

For MoModbusmplementation and address mapping, there is a general document you can download from the article or search it in Fatek Web Site ( ). Note 1: There is no difference you’re intended to implement Ethernet, RS232/485 or Modem, the base protocol is applied in the object I’ll introduce. This article introduces a purely code-based protocol implementation, what you can easily add into your project ensures you a safe reliable RS232/485 PC-PLC communication and surpass any OPC Servers which are presented in a tremendous priced (The last OPC server I’ve searched was about 350$)!! NET based object, you've just selected the right article.

#Serial communication protocol series

If you're tired of using some complex non-real-time COM/COM+ components (as I am D) that forces you to connect Fatek PLC series and are interested in an easy understanding, open source, real real-time.

Download FATEK_Communication_Protocol - 415.99 KB.

Download Fatek LabviewImplementations - 263.95 KB.