User's Manual

Product Manual - RFID Reader LF60C SoliD 67
Chapter 7
Operation
Direction reader to host 0x81xx *
Direction Host to equipment (reader) 0x01xx *
* The serial number is located on a label on the reader.
The W bit indicates that the sender of a primary message expects a reply. A value
of 1 in the W bit means that a reply is expected.
The message ID identifies the format and content of the message being sent.
A primary message is defined as any odd-numbered message.
A secondary message is defined as any even-numbered message.
The end bit determines whether a block is the last block of the message. A value
of 1 means that the block is the last block.
A message sent as more than one block is called a multi-block message. A
block number of 1 is given to the first block, and the block number is incremented
by one for each subsequent block until the entire message is sent.
As all messages can be sent in one block, the block number always has the value
1.
The system bytes in the header of each message for a given device ID must
meet the following requirements:
■ The system bytes of a primary message must be distinct from the bytes
of all currently open transactions initiated from the same end of the
communications link.
■ The system bytes of the reply message are required to be the same as
the system bytes of the corresponding primary message.
The system bytes are incremented for each primary message.
The checksum is calculated as the numeric sum of the unsigned binary values of
all the bytes, after the length byte and before the checksum and in a single block.
Upper device ID R-bit 0 0 0 0 0 1
Lower device ID
Last two digits of the serial
number