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1、.1. 11 CHFRS485ModBus PC/PLC 11.1 Modbus () 11.2 CHFRS232/RS485 11.3 (1) RS485 (2) (3) 12470 ModBus 11.4 CHFModBus / / PC PLCCHF / .2. 11.5 CHFModBusRTU ASCIIAmerican Standard Code for Information International Interchange RTU 8 09AF 8 ASCII 16ASCII 09AF16ASCII 0 1 2 3 4 5 6 7 8 9 ASCII CODE 0x30 0x
2、31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 A B C D E F ASCII CODE 0x41 0x42 0x43 0x44 0x45 0x46 78 11-bit Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 10-bit Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 RTU3.5 3.5 CRC 0.9 A.F 3.5 .3. 1.5 3.5 CRC RTU START T1-T2-T3-T43.5 ADDR 02470 CMD 03H 06H DATAN-1 DATA0 2*N CRC
3、 CHK CRC CHK CRC16BIT END T1-T2-T3-T43.5 ASCII0x3A,CRLF0x0D 0x0AASCII ASCII44ASCII 8AFASCII LRC () .4. ASCII START :0x3A Address Hi Address Lo 8-bit 2ASCII Function Hi Function Lo 8-bit 2ASCII DATAN-1 DATA0 nx8-bit 2nASCII n1)0xa001; else crc_value=crc_value1; return(crc_value); CKSMCRC ROM 11.6.3.3
4、 ASCIILRC Check .9. LRC CheckAddressData Content 11.6.20x02+0x06+0x00+0x08+0x13+0x88=0xAB 2=0x55 11.6.4 (1) P5.05 58003AH 000100FF PE EEPROMEEPROM RAM 01 P0.07EEPROMRAM 8007HRAM 2 R/W 0001H 0002H 0003H 0004H 0005H 0006H 0007H 1000H 0008H W/R 0001H 1001H 0002H R .10. 0003H 0004H 2000H -1000010000 -10
5、0.00%100.00% P0.04 PIDPID PIDPID PID W/R 3000H R 3001H R 3002H R 3003H R 3004H R 3005H R 3006H R 3007H R 3008H PID R 3009H PID R 300AH R 300BH R 300CH AI1 R 300DH AI2 R 300EH R 300FH R 3010H HDI R 3011H R 3012H PLC R 3013H R / 3014H R .11. 5000H R ModBus 5001H 0000H 0001H 0002H 0003HCRC 0004H 0005H 0006H 0007H 0008HEEPROM R 11.6.5 030606 0x5001 RTU START T1-T2-T3-T43.5 ADDR 01H CMD 06H 50H 01H 00H 05H CRC CHK 09H CRC CHK 09H END T1-T2-T3-T43.5 .12. ASCII START : 0 ADDR 1 0 CMD 6 5 0 0 1 0 0 0 5 LRC CHK Hi A LRC CHK Lo 3 END Lo CR END Hi LF 1 2 3 CRC 4 5 6 7 8 EEPROM