70PR05B-ES HESG332204R0001 pi protocol is mainly used for programming, ppi networking, hmi interface, etc.; the free protocol can be user-defined communication protocols, networking the cpu with any communication protocols publicly available devices, such as the upper computer, printers, barcoders and so on. The so-called free protocol, the user can change the baud rate of the 485 port, data format (number of data bits, stop bits, parity) to adapt to different communication protocols by setting the parameters of the special register smb30, smb130 (corresponding to the 226’s 2 # port). 226 has two communication ports, which can be connected to two different peripherals at the same time.

70PR05B-ES HESG332204R0001 instructions are simple, for example, xmt99, 0 can be completed up to 255 bytes (byte number set by vb99 within the number of decisions) of the transmission; and receive to be completed by the interrupt procedure, each received a byte of data will generate an interrupt, the received data is stored in the receiver buffer (smb2), interrupt the service procedure you must immediately process this service procedure, you must immediately deal with this data, because the next byte to be received in smb2, that is to say, the size of the receive buffer is only one byte, this example is only used to receive.

70PR05B-ES HESG332204R0001 is connected through an rs232/485 converter, and the monitoring programme of the upper pc is completed by using the Configuration King (kingview) of Beijing Asian Control Company. Kingview is a more widely used industrial control platform in China, with good human-machine interface and network functions. In the configuration environment, the designers of the plc parameters, status, barcode settings; operating environment in the form of human-computer interface to the barcode information monitoring, control commands issued by the plc, the relevant data storage reports, while the use of web functionality so that the system has an on-line monitoring function, that is, in the case of authorisation of the host computer in any one of the networked computers with a standard browser can be monitored remotely. Limited to space, the monitoring procedure will not be described in detail.