到Alien RFID读取器的Python接口

Question

已更正。请参阅下面对我自己问题的回答。

我正在尝试使用Python 2.7通过TCP/IP接口与Alien RFID 9800读取器通信。

但是，附加的测试代码不会超出读取器登录，并且读取器不会处理"Get ReaderName“命令。

我使用的是默认用户名(外国人)和密码(密码)。在Alien界面中，一切运行正常。登录交换有什么问题吗？有什么不对吗？

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()

Answer 1

您有一些print response命令。打印任何东西，还是不打印？

Answer 2

经过进一步的实验，我可以确认对于TCP接口，命令终止符只是'\n‘LF，而不是'\r\n’CR。因此，如果将上面的代码更正为：

CmdDelim = '\n'

现在，一切工作正常。

不幸的是，Alien文档非常明确地指出CR是命令终止符。这可能适用于串行接口，但不适用于TCP。