Python serial，,__init__(p

Python serial，,__init__(p

__init__(port=None, baudrate=9600, bytesize=EIGHTBITS, parity=PARITY_NONE, stopbits=STOPBITS_ONE, timeout=None, xonxoff=False, rtscts=False, write_timeout=None, dsrdtr=False, inter_byte_timeout=None)Parameters:port – Device name or None.baudrate (int) – Baud rate such as 9600 or 115200 etc.bytesize – Number of data bits. Possible values: FIVEBITS, SIXBITS, SEVENBITS, EIGHTBITSparity – Enable parity checking. Possible values: PARITY_NONE, PARITY_EVEN, PARITY_ODD PARITY_MARK, PARITY_SPACEstopbits – Number of stop bits. Possible values: STOPBITS_ONE, STOPBITS_ONE_POINT_FIVE, STOPBITS_TWOtimeout (float) – Set a read timeout value.xonxoff (bool) – Enable software flow control.rtscts (bool) – Enable hardware (RTS/CTS) flow control.dsrdtr (bool) – Enable hardware (DSR/DTR) flow control.write_timeout (float) – Set a write timeout value.inter_byte_timeout (float) – Inter-character timeout, None to disable (default).

Raises:

ValueError – Will be raised when parameter are out of range, e.g. baud rate, data bits.SerialException – In case the device can not be found or can not be configured.

 1 import serial 2 import time 3  4  5 # initialize the serial ports 6 t = serial.Serial(‘com9‘,9600,timeout = 0.1) 7 #write commond list, commond should be ended with ‘\n‘ or ‘\r‘ 8 cmd_list = [‘val?\r‘,‘temp?\r‘] 9 a = ‘‘10 11 #t.close() # close port12 #t.open() # open port13 14 print t.portstr #print port number15 for idx2 in cmd_list:16     n = t.write(idx2)17     #print n  #18     #s1 = t.readall()19     s1 = t.readline()20     #s1 = t.readlines()21     print s122 23 #t = serial.Serial(‘com8‘,9600,timeout = 0.1)24 #for idx1 in cmd_list:25 #    t.write(idx1)26 #    start = time.clock()27 #    while(True):28 #        s = t.read(1)29 #        a = a + s30 #        if(str(s) == ‘\r‘):31 #            break32 #        now = time.clock()33 #        if(now - start) > 2:34 #            print ‘timeout‘35 #            break36 #    print a37 #    a = ‘‘38 39 t.close()

Python serial