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這是找到的宏指令模板
// Read Holding Registers
macro_command main()
char command[32], response[32]
short address, checksum
short read_no, return_value, read_data[2], i
FILL(command[0], 0, 32)// initialize command[0]~command[31] to 0
FILL(response[0], 0, 32)
command[0] = 0x1// station number
command[1] = 0x3// read holding registers (function code is 0x3)
address = 0// starting address (4x_1) is 0
HIBYTE(address, command[2])
LOBYTE(address, command[3])
read_no = 2// the total words of reading is 2 words
HIBYTE(read_no, command[4])
LOBYTE(read_no, command[5])
CRC(command[0], checksum, 6)// calculate 16-bit CRC
LOBYTE(checksum, command[6])
HIBYTE(checksum, command[7])
OUTPORT(command[0], "MODBUS RTU Device",8)// send request
INPORT(response[0], "MODBUS RTU Device",9,return_value)// read response
if (return_value > 0 and response[1] == 0x4) then
read_data[0] = response[4] + (response[3] << 8)// 4x_1
read_data[1] = response[6] + (response[5] << 8)// 4x_2
SetData(read_data[0], "Local HMI", LW, 0, 2)
end if
end macro_command

通過485連電腦，用串口助手讀到的數(shù)據(jù)卻是
7F DF EB FF FB 5D 6D 00  

不知道是什么原因？
剛接觸這個(gè)東西，望大神指教！

呵呵，