python串口發送負數

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=================================================================
#coding=gb18030

import sys,threading,time;
import serial;
import binascii,encodings;
import re;
import socket;

class ReadThread:
def __init__(self, Output=None, Port=0, Log=None, i_FirstMethod=True):
self.l_serial = None;
self.alive = False;
self.waitEnd = None;
self.bFirstMethod = i_FirstMethod;
self.sendport = '';
self.log = Log;
self.output = Output;
self.port = Port;
self.re_num = None;

def waiting(self):
if not self.waitEnd is None:
self.waitEnd.wait();

def SetStopEvent(self):
if not self.waitEnd is None:
self.waitEnd.set();
self.alive = False;
self.stop();

def start(self):
self.l_serial = serial.Serial();
self.l_serial.port = self.port;
self.l_serial.baudrate = 9600;
self.l_serial.timeout = 2;

self.re_num = re.compile('\d');

try:
if not self.output is None:
self.output.WriteText(u'鎵撳紑閫氳絝鍙\r\n');
if not self.log is None:
self.log.info(u'鎵撳紑閫氳絝鍙');
self.l_serial.open();
except Exception, ex:
if self.l_serial.isOpen():
self.l_serial.close();

self.l_serial = None;

if not self.output is None:
self.output.WriteText(u'鍑洪敊錛\r\n %s\r\n' % ex);
if not self.log is None:
self.log.error(u'%s' % ex);
return False;

if self.l_serial.isOpen():
if not self.output is None:
self.output.WriteText(u'鍒涘緩鎺ユ敹浠誨姟\r\n');
if not self.log is None:
self.log.info(u'鍒涘緩鎺ユ敹浠誨姟');
self.waitEnd = threading.Event();
self.alive = True;
self.thread_read = None;
self.thread_read = threading.Thread(target=self.FirstReader);
self.thread_read.setDaemon(1);
self.thread_read.start();
return True;
else:
if not self.output is None:
self.output.WriteText(u'閫氳絝鍙ｆ湭鎵撳紑\r\n');
if not self.log is None:
self.log.info(u'閫氳絝鍙ｆ湭鎵撳紑');
return False;

def InitHead(self):
#涓插彛鐨勫叾瀹冪殑涓浜涘勭悊
try:
time.sleep(3);
if not self.output is None:
self.output.WriteText(u'鏁版嵁鎺ユ敹浠誨姟寮濮嬭繛鎺ョ綉緇\r\n');
if not self.log is None:
self.log.info(u'鏁版嵁鎺ユ敹浠誨姟寮濮嬭繛鎺ョ綉緇');
self.l_serial.flushInput();
self.l_serial.write('\x11');
data1 = self.l_serial.read(1024);
except ValueError,ex:
if not self.output is None:
self.output.WriteText(u'鍑洪敊錛\r\n %s\r\n' % ex);
if not self.log is None:
self.log.error(u'%s' % ex);
self.SetStopEvent();
return;

if not self.output is None:
self.output.WriteText(u'寮濮嬫帴鏀舵暟鎹\r\n');
if not self.log is None:
self.log.info(u'寮濮嬫帴鏀舵暟鎹');
self.output.WriteText(u'===================================\r\n');

def SendData(self, i_msg):
lmsg = '';
isOK = False;
if isinstance(i_msg, unicode):
lmsg = i_msg.encode('gb18030');
else:
lmsg = i_msg;
try:
#鍙戦佹暟鎹鍒扮浉搴旂殑澶勭悊緇勪歡
pass
except Exception, ex:
pass;
return isOK;

def FirstReader(self):
data1 = '';
isQuanJiao = True;
isFirstMethod = True;
isEnd = True;
readCount = 0;
saveCount = 0;
RepPos = 0;
#read Head Infor content
self.InitHead();

while self.alive:
try:
data = '';
n = self.l_serial.inWaiting();
if n:
data = data + self.l_serial.read(n);
#print binascii.b2a_hex(data),

for l in xrange(len(data)):
if ord(data[l])==0x8E:
isQuanJiao = True;
continue;
if ord(data[l])==0x8F:
isQuanJiao = False;
continue;
if ord(data[l]) == 0x80 or ord(data[l]) == 0x00:
if len(data1)>10:
if not self.re_num.search(data1,1) is None:
saveCount = saveCount + 1;
if RepPos==0:
RepPos = self.output.GetInsertionPoint();
self.output.Remove(RepPos,self.output.GetLastPosition());

self.SendData(data1);
data1 = '';
continue;
except Exception, ex:
if not self.log is None:
self.log.error(u'%s' % ex);

self.waitEnd.set();
self.alive = False;

def stop(self):
self.alive = False;
self.thread_read.join();
if self.l_serial.isOpen():
self.l_serial.close();
if not self.output is None:
self.output.WriteText(u'鍏抽棴閫氳繀絝鍙ｏ細[%d] \r\n' % self.port);
if not self.log is None:
self.log.info(u'鍏抽棴閫氳繀絝鍙ｏ細[%d]' % self.port);

def printHex(self, s):
s1 = binascii.b2a_hex(s);
print s1;

#嫻嬭瘯鐢ㄩ儴鍒
if __name__ == '__main__':
rt = ReadThread();
f = open("sendport.cfg", "r")
rt.sendport = f.read()
f.close()
try:
if rt.start():
rt.waiting();
rt.stop();
else:
pass;
except Exception,se:
print str(se);

if rt.alive:
rt.stop();

print 'End OK .';
del rt;

㈡ python Serial 串口能不能發送16進制的數字

pyserial默認的寫入格式是字元串，並不是16進制的。接收到的也是字元串，除非你在接收端設置了默認接受hex格式，就會顯示hex。我用過藍牙串口和Arino開發板的串口，收到的都是字元串。

㈢ python 如何防止串口通信失敗

Python中串口出現異常通常有：1.打開串口時，串口不存在，2.寫串口時，3.讀串口時。這幾個異常是經常會碰到的（有經驗的人就深有體會），一旦異常出現了，整個程序很可能會因此就運行不下去了。避免因為這些異常的出現而導致程序死機的方法是對這些可能存在的異常進行捕捉。舉一個例子：
try:
ComDev.read(1)
print "read Com ok!"
except:
print "read Com error!"
上面的代碼意思是：對ComDev這個串口對象讀取一個位元組，如果讀成功，就接著執行print "read Com ok!"而不執行except以下的語句，如果讀出現異常，就執行print "read Com error"而不執行
print "read Com ok!"
當然系統還會拋出異常信息，只是我這里沒有進行接收，個人覺得很多異常不必接收其信息。

㈣ Python如何進行多串口通信一個串口控制電機 一個串口採集數據

下載 pyserial包
def OpenCom(self,*args): #設置埠和波特率 selComPort =『com2』 #波特率 selBaudRate =9600 #奇偶校驗 selParity = 'N' try: if(not self.mySerial): self.mySerial = serial.Serial(port=selComPort, baudrate=selBaudRate,bytesize=8,parity=selParity,stopbits=1,timeout=5) else: if(self.mySerial.isOpen()): self.mySerial.close() self.mySerial = serial.Serial(port=selComPort, baudrate=selBaudRate, bytesize=8, parity=selParity, stopbits=1, timeout=5) self.lblInfo['text'] = '打開成功！' except Exception as ex: self.lblInfo['text'] = '打開失敗！'

#使用com口發送modbus協議給終端設備。
def btnEmId_Click(self):
barray = bytearray([0x05, 0x03, 0xA#, 0x54, 0x00, 0x08])
vOldEmId = self.txbOldEmId.get()
vNewEmId = self.txbNewEmId.get()
barray[0] = int(vOldEmId)
barray[5] = int(vNewEmId)
#crc校驗
strInput = utils.crc16_append(barray)
print(barray)
n = self.mySerial.write(barray)
if(n > 0):
str = self.mySerial.readall()
self.lblInfo['text'] = 'success！'
# for s in str:
# print (hex(s))
else:
self.lblInfo['text'] = 'error！'

㈤ python獲取串口設備的描述

importwinreg

key=winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,r"{36FC9E60-C465-11CF-8056-444553540000}")
foriinrange(winreg.QueryInfoKey(key)[0]):
subkey=winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,"SYSTEM\ControlSet001\Control\Class\{36FC9E60-C465-11CF-8056-444553540000}\"+winreg.EnumKey(key,i))
print(winreg.QueryValueEx(subkey,'DriverDesc'))
winreg.CloseKey(subkey)
winreg.CloseKey(key)

importwinreg

key=winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,r"")
try:
i=0
while1:
name,value,type=winreg.EnumValue(key,i)
print(repr(name),value)
i+=1
value,type=winreg.QueryValueEx(key,"EnableAutoTray")
exceptFileNotFoundError:
print
exceptOSError:
print

以前回答過一個，好像跟你說的意思差不多，都是讀取注冊表，一個讀USB，一個是串口

㈥ 如何用python寫個串口通信的程序

打開串口後啟動一個線程來監聽串口數據的進入，有數據時，就做數據的處理。

㈦ 調用python模塊串口的write寫的數據與串口實際寫的數

1、寫入的數據長度不一致。在使用Python的`serial`模塊進行串口通信時，使用`write`函數寫入數據時需要指定寫入數據的長度，如果指定的長度與實際寫入的數據長度不一致，就會導致寫入的數據與實際寫入的數據不同。
2、串口參數設置不正確。在使用Python的`serial`模塊進行串口通信時，需要設置串口的通信參數，如波特率、數據位、校驗位、停止位等。如果設置不正確，就會導致寫入的數據與實際寫入的數據不同。
3、串口通信過程中出現錯誤。在串口通信過程中，可能會出現一些錯誤，如數據丟失、數據重復等問題，這也會導致寫入的數據與實際寫入的數據不同。