[工學(xué)]7章分散型測控網(wǎng)絡(luò)技術(shù)for32hours-資料下載頁
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【正文】 n of write instruction 02H 30H 31H 30H 58H 57H 53H 2CH 31H 30H 30H 31H 57H 2CH 32H 03H 46H 45H 0DH 0AH STX 0 1 0 0 X W S , 1 0 0 1 W , 2 ETX F E CR 30H LF Data link layer Data link layer Application layer Write data Leading write data address write instruction code 2CH 36H , 6 35H 5 02H 30H 31H 30H 58H 30H 30H 03H 38H 32H 0DH 0AH STX 0 1 0 0 X 0 0 ETX 8 2 CR 30H LF Data link layer Data link layer Application layer Termination code (00 normal) ? Write response ? SETUP Items of SDC40B C25: the munication function is not activated at address 0 C26： 0: 9600bps, even parity, 1 stop bit 1: 9600bps, ne parity, 2 stop bits 2: 4800bps, even parity, I stop bit 3: 4800bps, no parity, 2 stop bits C27： 0: write enabled 1: write inhibited Code Item Default settings Setting range C25 Station address 0 0 to 127 C26 Transmission speed 0 0 to 3 C27 CPL munication write enabled/inhibited 0 0 to 1 ? Communication Procedure (1) The master station transmits an instruction message to a slave station to specify a station for munication. (2) The slave station processes the instruction message and executes read and write operations. (3) The slave station transmits a response message according to the contents of processing. (4) The master station receives the response message and executes processing.
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