Syslot SR-MU921B 30dbm Long Range Uhf Rfid Reader Moudle User Manual
- June 5, 2024
- Syslot
Table of Contents
SR-MU921B 30dbm Long Range Uhf Rfid Reader Moudle
User Manual
RFID fundamentals
Radio Frequency Identification (RFID) is a wireless communication technology.
It can identify the object under test through radio signals, and the system
does not need to contact with the object under test.
By inductively coupled electromagnetic fields, radio signals transmit
information from electronic tags placed on the object under test, thereby
automatically identifying it. The tag, which can be identified within a few
meters, contains electronically stored information. Unlike bar codes, RFID
tags do not have to be seen from the human eye, but can be identified from the
object being identified.
SR-MU921B Overview
General Description：
SR-MU921B is a high performance UHF RFID Reader Module, which is designed with
lower dissipation, high integrated RFID chip design, cost effective and small
size. It can be widely applied in many RFID application systems such as
logistics, access control, attendance system, anti-counterfeit and industrial
production process control system etc.
Features：
- Designed based on low dissipation (single +5V power supply) and high integration RF transceiver chip
- Support EU 866~868MHz, US 902~928MHz working frequency (or Customized).
- Support EPC global UHF class 1 gen2 / ISO18000-6C protocol RFID tags.
- Support temperature sensor RFID tag, moisture Sensor RFID tag and some other sensor RFID tags.
- Optimized multiple tags inventory algorithm, inventory tags speed is more than 100 per second
- Support 4 external antennas with MCX or IPX socket
- Support 4 GPIO ports GPIO, I/O Control for RS-485 port and indication I/O for Read Tag.
- Support UART (3.3V TTL level) interface.
- Support IAP firmware upgrading.
- Provide free DEMO software and SDK for testing and further development.
SR-MU921B principle description
SR-MU921B is a high performance UHF RFID Reader Module, which is designed base
on a high integrated RFID Reader chip, with low cost effective and small size.
It meets EPC Gen2/ISO18000-6C tag protocol which is an international RFID
standard.
The follow diagram shows the principle of the SR-MU921B.
There are several circuit unit, including Communication Port, Power unit, MCU unit, Reader Chip unit, Transmit Path unit, Receive Path unit, Coupler and RF Antenna unit.
Communication Port
Communication Port provide the communication function between the reader
module and the host from outside the reader module. There are two kind of
communication port. One is a UART serial port, the other is General Purpose
Input/Output port (GPIO).
For the UART serial port, the reader module receives control commands from the
host through the UART serial port; at the same time, it return back the data
of the electronic tag that read by the reader module to host and so on.
For the GPIO port, the host control the reader module power up or power down,
also reset the reader module by the GPIO port. The reader module can be
triggered to start some operation or task through the GPIO port when it is in
the status of input, and can also control the peripheral outside of reader
module through the GPIO port when it is in the status of output.
Power unit
The Power Unit have two part of power. One of the power provide the work
energy for the digital circuit, including the Microcontroller Unit (MCU) and
the Reader Chip Unit; the other of the power provide the work energy for the
RF transmit circuit, including the RF Amplifier and RF Switch circuit and so
on.
The host outside can power up or shut down the Digital Power through the GPIO
port from the Communication Port.
The RF Power is control on or shut down by the MCU depend on the RF signal
need to be transmitted or not.
MCU unit
MCU unit base on a High-performant Cortex-M3 microcontroller, which run some
software module to support the function of Reader Module, including
Communication process, Tag protocol flow process, Tag receive data process,
RF power control and Antenna control and so on.
Communication process are communication with two side unit, one is
communication with Host outside of Reader Module, and the other is
communication with the Reader Chip unit.
Tag protocol flow process the flow of tag operation which base on ISO-18000-6C
protocol.
Tag receive data process get the tag data received from the tags during the
flow of tag operation.
RF power control is used to control the RF power when host needs.
Antenna control send the GPIO signal to switch the antenna channel according
the Host command.
Reader Chip unit
Reader Chip unit base on a High-performant and low cost RFID Reader Chip.
There are modulation circuit, demodulation circuit, LNA, PLL circuit, embedded
MCU circuit and UART port.
The RFID Reader Chip is in charge of generating the based Tag instruction that
was modulated into a Transmit Path unit and demodulate the tag response data
from these electronic tags.
MCU unit send a tag operation command to the embedded MCU of Reader Chip, then
the modulation circuit and PLL of Reader Chip generate the RF Tag instruction
for the Transmit Path unit to send a RF modulate wave to an electronic tag.
Reader Chip unit receive the tag response data from the electronic tag through
the Receive Path. LNA amplifies the tag signal; the demodulation circuit
demodulated the RF tag signal into a digital signal and decode it into tag
data; the embedded MCU package the tag data, then return it back to the MCU
unit for further process.
Transmit Path unit
Transmit Path unit is a transmitted channel to amplify and transmit the RF
signal which was modulated by a tag command from Reader Chip unit, including a
power amplifier and a filter circuit.
Receive Path unit
Receive Path unit receive the response RF signal from electronic tag. There
are receive filter, impedance transformer circuit and so on.
Coupler unit
The main function of couplers unit is to separate RF signals between transmit
and receive signal. On the one hand, it pass the transmit RF signal to RF
Antenna unit, on the other hand, it pass the receive RF signal to Receive
Path unit.
RF Antenna unit
The main function of RF Antenna unit is transmit the RF signal from the PA of
Transmit Path unit and receive the tag response RF signal to Receive Path
unit.
FCC Statement
This device complies with part 15 of the FCC rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received, incl
uding interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’ s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursua nt to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful inte rference
in a residential installation. This equipment generates uses and can radiate
radio frequency energy a nd, if not installed and used in accordance with the
instructions, may cause harmful interference to radio.com
munications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turn
ing the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help important announcement
Important Note:
In the event that these conditions cannot be met (for example certain laptop
configurations or co-location with another transmitter), then the FCC
authorization is no longer considered valid and the FCC ID cannot be used on
the final product. In these circumstances, the OEM integrator will be
responsible for re-evaluating the end product (including the transmitter) and
obtaining a separate FCC authorization.
End Product Labeling
The final end product must be labeled in a visible area with the following”
Contains FCC ID:
2AW6BSR-MU921B”
Manual Information to the End User
The OEM integrator has to be aware not to provide information to the end user
regarding how to install or remove this RF module in the user’s manual of the
end product which integrates this module.
The end user manual shall include all required regulatory information/warning
as show in this manual.
Integration instructions for host product manufacturers according to KDB 996369 D03 OEM Manual v01 2.2 List of applicable FCC rules
CFR 47 FCC PART 15 SUBPART C has been investigated. It is applicable to the modular transmitter 2.3 Specific operational use conditions
This module is stand-alone modular. If the end product will involve the Multiple simultaneously transmitting condition or different operational conditions for a stand-alone modular transmitter in a host, host manufacturer have to consult with module manufacturer for the installation method in end system.
Limited module procedures
Not applicable
Trace antenna designs
Not applicable
RF exposure considerations
Not applicable
Antennas
This radio transmitter 2AW6BSR-MU921B has been approved by Federal
Communications Commission to operate with the antenna types listed below, with
the maximum permissible gain indicated. Antenna types not included in this
list that have a gain greater than the maximum gain indicated for any type
listed are strictly prohibited for use with this device.
Label and compliance information
The final end product must be labeled in a visible area with the following”
Contains FCC ID:2AW6BSR-MU921B”.
Information on test modes and additional testing requirements
Host manufacturer is strongly recommended to confirm compliance with FCC
requirements for the transmitter when the module isinstalled in the host.
Additional testing, Part 15 Subpart B disclaimer
Host manufacturer is responsible for compliance of the host system with module
installed with all other applicable requirements for the system such as Part
15 B.
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