Dual Wiegand to RS232 converter.
WIE232-A |
Various industrial
products output a code in wiegand
format. Often this is an inconvenient
form for reading to a PC or other device having only a RS232 serial port. This Wiegand to RS232 converter is designed with 2 ports for taking up to 2 Wiegand sources using Wiegand 26 bit format and converting it to a RS232 data stream at 9600 Baud. Its features are:
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Wiegand input format description:Wiegand protocol provides 2 lines for data transfer. A pulsed transition on the DATA1 line indicates a logic1 bit, while a pulsed transition on the DATA0 line indicates a logic 0 bit. In their idle state both lines are held high. During data transfer the appropriate logic line will pulse low for 50uS followed by a period of 2ms where both lines are held high. In this fashion each bit is transmitted in sequence until all bits are sent. The end of the transmission is signaled by both lines being held high for more than 50mS. Figure 1 shows an example of the timing sequence for Wiegand protocol.  Wiegand 26 input format description:Wiegand 26 protocol is defined as a stream of 26 bits, consisting of 1 Even parity bit, 24 data bits, and 1 Odd parity bit. The WIE232-A will
read a signal presented in Wiegand 26 format and after checking for
parity and bit length
will convert the data stream to a serial RS232 output on the corresponding output connector. As only 24 bits of the 26 bit stream is data the string is converted to 6 ascii coded characters representing 24bits in hexadecimal coding. The format for this is: XXYYZZ<crn> where XX are the hexadecimal representation of bits 1-8 YY are the hexadecimal representation of bits 9-16 ZZ are the hexadecimal representation of bits 17-24 <crn> is a carriage return character $0D The serial output
stream is sent at 9600 Baud, 8 data bits, no parity, 1 stop bit.
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