用RS485做了个自由口通讯的，每次上电后，第一次发送字符串的时候都是乱码或者乱码+正常字符串，但是第二次开始就是正常的，几乎每次上电第一次都是这样，是什么问题啊？附上宏指令：

macro_command main()

char command[32]

bool SOT,EOT

char  response[32]

short input_data1,n1

int input_data2

FILL(command[0], 0, 32)

GetData(SOT, "OMRON CJ1/CS1", W_Bit, 6000, 1)

if SOT == 1 then

GetData(input_data1, "OMRON CJ1/CS1", D, 15000, 1)

GetData(input_data2, "OMRON CJ1/CS1", D, 15002, 1)

n1 = 0

command[0] = '{'

command[5] = ','

//command[6] = 0x7f

command[10] = ','

//command[12] = 0x7f

command[19] = '}'

DEC2ASCII(input_data1, command[1], 4)

DEC2ASCII(input_data1, command[6], 4)

DEC2ASCII(input_data2, command[11], 8)// no. of ASCII == 5

OUTPORT(command[0], "MODBUS RTU Device", 20)

SOT = 0

SetData(SOT, "OMRON CJ1/CS1", W_Bit, 6000, 1)

end if

end macro_command