已更正。请看下面对我自己问题的回答。在
我正试图通过python2.7的TCP/IP接口与一个外来的rfid9800阅读器进行通信。
但是,附加的测试代码不会超出读卡器的登录名,并且读卡器不会处理“get ReaderName”命令。
我使用的是默认用户名(alien)和密码(password)。从外星界面看一切正常。登录交换有问题吗?什么不对?在
import socket
cmdHost, cmdPort = '192.168.1.106', 23
CmdDelim = '\n' # Corrected from '\n\r' to '\n'. Delimiter of Alien commands (sent to reader).
ReaderDelim = '\r\n\0' # Delimiter of Alien reader responses (received from reader).
CmdPrefix = chr(1) # Causes Alien reader to suppress prompt on response.
def getResponse( conn ):
''' Get the reader's response with correct terminator. '''
response = ''
while not response.endswith( ReaderDelim ):
more = conn.recv( 4096 )
if not more:
break
response += more
return response
def GetReaderName():
''' Log into the reader, get the reader name, then quit. '''
print 'Sending commands to the Alien reader...'
cmdSocket = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
try:
cmdSocket.connect( (cmdHost, int(cmdPort)) )
except Exception as inst:
log( 'Reader Connection Failed: CmdAddr=%s:%d' % (cmdHost, cmdPort) )
log( '%s' % inst )
cmdSocket.close()
return False
# Read the initial header from the reader.
response = getResponse( cmdSocket )
print response
# UserName
cmdSocket.sendall( 'alien%s' % CmdDelim )
response = getResponse( cmdSocket )
print response
# Password
cmdSocket.sendall( 'password%s' % CmdDelim )
response = getResponse( cmdSocket )
print response
# Get ReaderName command
cmdSocket.sendall( '%sGet ReaderName%s' % (CmdPrefix, CmdDelim) )
response = getResponse( cmdSocket )
print response
# Quit
cmdSocket.sendall( '%sQuit%s' % (CmdPrefix, CmdDelim) )
response = getResponse( cmdSocket )
print response
cmdSocket.close()
return True
if __name__ == '__main__':
GetReaderName()
您有一些
print response
命令。打印什么,还是不打印?在在进一步的实验之后,我可以确认命令终止符只是'\n'[LF],而不是TCP接口的'\r\n'[CR][LR]。因此,如果将上述代码更正为:
现在,一切正常。在
不幸的是,外星人的文件非常明确地指出[CR][LF]是命令终止符。也许这对串行接口是正确的,但它不适用于TCP。在
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