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LRP2000 Passive Reader/Writer
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6.6 ABx ASCII Protocol
The ABx ASCII Protocol is based on the ABx Fast protocol. It uses the same headers and terminator
(already ASCII characters) and converts the hex value of command and data bytes to printable ASCII (two-
digit hexadecimal notation). In another words, the hex values given in an ABx Fast command are
transmitted as separate ASCII characters. Since it is an ASCII protocol, the Xon/Xoff handshake can be
used.
Command Packet Structure
The command protocol is based on the following minimal packet structure. The data field and the
checksum may not be present depending on the command type and your checksum setting.
6.6.1 ABx ASCII Protocol Command Structure
Following a successful operation, the controller responds with the response structure shown in 6.6.2 ABx
ASCII Protocol Response Structure
. The data field and the checksum may not be present depending on the
command and your checksum setting. If a checksum is enabled in the Configuration Menu, then it is
always present for every command.
6.6.2 ABx ASCII Protocol Response Structure
Field
Number of ASCII
Characters
Content
Header 2 <STX><STX>
(02H, 02H)
Command Size 4 Packet length in bytes excluding the header, command size, checksum, and
terminator bytes
Command 2 Command Code
(Data) Variable Command data/parameters
Checksum 2 Optional checksum
Terminator 1 <ETX>(03H)
Field
Number of
ASCII
Characters
Content
Header 2 <STX><STX>
(02H, 02H)
Response Size 4 Packet length in bytes excluding the header, command size, checksum, and
terminator bytes
Command 2 Command echo
(Data) Variable Response data
Checksum 2 Optional checksum
Terminator 1 <ETX> (03H)