User Manual
Table Of Contents
- LRP75 Long Range Passive Reader/Writer
- Table of Contents
- Getting Started
- Mechanical Specifications
- Power and Electrical Interface
- Configuration Menu
- Standard RFID Interface
- 5.1 Introduction
- 5.2 Command Timeout Values
- 5.3 Address Blocks
- 5.4 ABx Error Codes
- 5.5 Command Descriptions
- 5.6 ABx Standard Commands
- 5.6.1 Command 4 (04 Hex): Tag Fill
- 5.6.2 Command 5 (05 Hex): Block Read
- 5.6.3 Command 6 (06 Hex): Block Write
- 5.6.4 Command 7 (07H): Read Tag Serial Number
- 5.6.5 Command 8 (08 Hex): Tag Search
- 5.6.6 Command D (0D Hex): Start/Stop Continuous Block Read
- 5.6.7 Command E (0EH) Read SN and Data
- 5.6.8 Command F (0FH) Start/Stop Continuous Read SN and Data
- 5.7 ABx Fast Commands
- 5.7.1 ABx Command Packet Structure
- 5.7.2 Command 4 (04 Hex): Tag Fill
- 5.7.3 Command 5 (05 Hex): Block Read
- 5.7.4 Command 6 (06 Hex): Block Write
- 5.7.5 Command 7 (07H): Read Tag Serial Number
- 5.7.6 Command 8 (08 Hex): Tag Search
- 5.7.7 Command D (0D Hex): Start/Stop Continuous Block Read
- 5.7.8 Command E (0EH) Read SN and Data
- 5.7.9 Command F (0FH) Start/Stop Continuous Read SN and Data
- Technical Specifications
- LRP75 Beta Connections
- Models and Accessories
- ASCII Chart
Standard RFID Interface
LRP75 Long Range Passive Reader/Writer 27
EXAMPLE
Checks for an RFID tag in the RF field. A timeout of 2 seconds
(07D0H = 2000 x 1 msec increments) is set for the completion of the
Tag Search.
5.6.6 Command D (0D Hex): Start/Stop Continuous
Block Read
DESCRIPTION
When in Continuous Block Read mode, the LRP75 sends block read
commands continuously to any tag in range of the antenna. The value
in the length field controls the command (start/stop).
DISCUSSION
When a tag enters the field of the antenna, the LRP75 reads the
specified data and passes it to the host. The LRP75 continues to read
the tag, but will not send the same data to the host until the tag has
been out of the antenna’s range for a specified time period. This
period is called the Delay Between Identical Reads. It prevents
redundant data transmission when the LRP75 is in Continuous Block
Read mode. The Delay Between Identical Reads can have an integral
value in seconds between 0 and 60. A value of 0 makes the LRP75
continuously read any tag in the RF field and send the data to the
host.
The LRP75 remains in Continuous Block Read mode until it receives
a new continuous read command with a zero read length. To stop
Continuous Block Read Mode, issue the Start/Stop Continuous Read
command with a read length of zero (0).
If the LRP75 receives any other command from the host while
performing continuous read, an error (0DH) will be sent to the host.
Command from the Host Response from the LRP75
MSB LSB Remarks MSB LSB Remarks
AAH 08H Perform Command 8 AAH 08H Command Echo
07H D0H Timeout value FFH FFH Message Terminator
FFH FFH Message Terminator