VB与PLC通讯资料集.pdf

www.PLC VB6.0 PC PLC PC FX PLC PLC PC SC-09 PLC 9 D PLC RS-422 PC PLC VB6 0 PLC FX PLC FX PLC 1 FX PLC 1 7 l l 9600bps ASCi 2 FX PLC 4 1 X Y M S T C D 3 FX PLC 5 2 4 PC PLC 3 STX ETX CMD ASC SUMH SUML CMD ETX ASC SUMH SUML www.PLC PLC PC 4 PC 1 MSComm VB MSComm PLC PC MSComm (1)CoinmPort (2)Settings - 4 (3)PortOpen (4)Input (5)Output (6)InputLen (7)InBufferCount 2 MSComm (1)PC PLC PC PLC D123 4 ( D123 D124) 5 www.PLC FX PLC address=address×2+1000h 123 7Bh address=addressx2+1000h=7Bhx2+1000h=10F6h ASCII 31h,30h,46h,36h SUM=30H+31H+30H+46H+36H+30H+34H+03H=174H SUMH 7 SUML 4 ASC “37H”“34H” PLC 6 (2) PLC PLC D123 “1234ABCD” 7 www.PLC www.PLC FXPLC FXPLC PLC FX-232AW DEVICEREADCMD0X,Y,M,S,T,C,D DEVICEWRITECMD1 X,Y,M,S,T,C,D FORCEONCMD7X,Y,M,S,T,C FORCEOFFCMD 8 X,Y,M,S,T,C :RS232C :9600bps :even : :ASCII 16 ENQ05H ACK06HPLC NAK15HPLC STX02H ETX03H STXCMDDATADATAETXSUM(u er)SUM(lower) STX,CMD,ADDRESS,BYTES,ETX,SUM 02H,30H,31H,30H,46H,36H,30H,34H,03H,37H,34H