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1、.1. 7 CHV160RS485ModBus PC/PLC 7.1 Modbus () 7.2 CHV160RS232/RS485 7.3 (1) RS485/RS232 (2) (3) 12470 ModBus 7.4 CHV160ModBus / .2. / PC PLCCHV160 / 7.5 CHV160ModBusRTU ASCIIAmerican Standard Code for Information International Interchange RTU 8 09AF 8 ASCII 16ASCII 09AF16ASCII 0 1 2 3 4 5 6 7 8 9 ASC
2、II CODE 0x30 0x31 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. 3.5 CRC 0.9 A.F 3.5 1.5 3.5 CRC RTU START T1-T2-T3-T43.5 ADDR 02470 CMD 03H 06H DATAN-
3、1 DATA0 2*N CRC 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); CKSMC
4、RC ROM 7.6.3.3 ASCIILRC Check LRC CheckAddressData Content 7.6.20x02+0x06+0x00+0x08+0x13+0x88=0xAB 2=0x55 7.6.4 (1) P5.05 58003AH 000100FF PE .10. EEPROMEEPROM RAM 01 P0.07EEPROMRAM 8007RAM 2 R/W 0001H 0002H 0003H 0004H 0005H 0006H 1000H 0007H W 0001H 0002H 0003H 1001H 0004H R 2000H -1000010000 -100
5、.00%100.00% P0.07 P3.14 PID PID W .11. PIDPID PID 2001H 000H03FFH S1S5HDI1HDI2S6S8 P5.01 HDI1HDI2 W 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 AI3 R 300FH AI4 R 3010H HDI R 3011H R 3012H PLC R 3013H R 3014H R / 3015H 01 R .12. 5000H R ModBus 5001H 0000H 0001H 0002H 0003HCRC 0004H 0005H 0006H 0007H 0008HEEPROM R