RS485 communication port Modbus RTU communication protocol ISO15693 industrial-grade high-frequency RFID reader CK-FR01-A01 is a high-frequency RFID tag reader based on radio frequency identification technology, the working frequency of the reader is 13.56MHZ, support for I- CODE 2, I-CODE SLI, etc. conform to the ISO15693 international standard protocol format label reading. The radio frequency part of the communication protocol is integrated inside the card reader. The user only needs to receive data through the RS485 communication interface to complete the reading operation of the tag without understanding the complex radio frequency communication protocol.
The card reader comes with an Auto-turning automatic tuning circuit, which can automatically adjust the circuit parameters when working in different environments to minimize the influence of the external environment on the reading distance, further enhance its own anti-interference ability, and have high receiving sensitivity , Stable performance, strong reliability and other characteristics.
The card reader can be widely used in logistics, warehouse management, process control, robotic arm site control and other fields.
Figure 1.1 Physical photo of CK-FR01-A01
- Working voltage: DC 24V;
- Power consumption: 0.7W;
- Circuit protection: with reverse polarity protection;
- Working frequency: 13.56MHZ;
- Protocol standard: ISO15693;
- Support tag types: I-CODE2, I-CODE SLI;
- Card reading distance: 0~40mm (related to label performance);
- Communication interface: RS485;
- Communication protocol: industrial MODBUS RTU communication protocol;
- Working humidity: 10-90% RH;
◆ Working temperature: -25℃－+85℃;
◆ Protection level: IP-67;
◆ Shell material: ABS + aluminum alloy.
Physical and environmental characteristics:
| project |
Technical Parameters |
| Operating temperature |
-25℃~85℃ |
| storage temperature |
-40℃~90℃ |
| Humidity |
10%~90% non-condensing state |
| Weight |
80g |
| Drop test |
1.2m free fall |
| ESD performance |
Air discharge ±15KV, contact discharge ±8KV |
| Sealing standard |
IP67 |
Electrical parameter index:
| project |
Technical Parameters |
| Operating Voltage |
DC 24V |
| Power consumption |
0.7W |
| Circuit protection |
With reverse polarity protection |
| working frequency |
13.56MHZ |
| Protocol standard |
ISO15693 |
| Support label type |
I-CODE2、I-CODE SLI |
| Card reading distance |
0~40mm (related to label performance) |
| Communication interface |
RS485 |
| letter of agreement |
MODBUS RTU communication protocol |
3. CK-FR01-A01 communication connection
CK-FR01-A01 is a high-frequency card reader based on RS485 and MODBUS communication protocol. It can support multiple card readers to work online, and can mount multiple CK-FR01-A01 on the bus at the same time.
3.1, LED indicator
Figure 4.1 Schematic diagram of the card reader LED indicator
LED indicator: label detection indicator
The working process of the card reader:
After the card reader is connected to the power supply, the card reader enters the auto-tuning state and performs self-test. After the self-test is successful, the green LED flashes, and then enters the working state, and the indicator light goes out. When the reader detects the presence of the RFID tag, the green LED will be on.
3.2, then line illustrates
The definition of CK-FR01-A01 wiring terminal is as follows:
Figure 4.2 CK-FR01-A01 wiring terminal definition
CK-FR01-A01:
| Terminal number |
interface |
Description |
| 1 |
VCC |
Card reader power supply 24V |
| 2 |
A |
RS485 communication port A line |
| 3 |
GND |
Reader 0V |
| 4 |
B |
RS485 communication port B line |
3.3, CK-FR01-A01 stand - alone wiring diagram
When CK-FR01-A01 is working in stand-alone mode, the wiring is as follows:
Figure 4.3 CK-FR01-A01 stand-alone communication
3.4, CK-FR01-A01 multi-machine communication wiring diagram
CK-FR01-A01 supports multiple card readers mounted on the same bus at the same time for multi-machine networking. When multiple card readers are mounted on the bus, in order to improve the reliability of communication, a 120Ω matching resistor needs to be connected to the front and back ends of the bus. The wiring is as follows:
Figure 4.4 CK-FR01-A01 multi-machine communication
3.5、Communication cable selection
In order to improve the reliability of communication and the EMI performance of the system, users can choose shielded twisted pair as the communication cable, or choose RS485 communication dedicated cable.
3.6、Relationship between communication distance and baud rate
When using 0.56mm (24AWG) twisted pair wiring, according to the different baud rate, the theoretical value of the maximum transmission distance is as follows:
Table 4‑1 Relationship between baud rate and communication distance
| Baud rate |
Maximum transmission distance |
| 4800Bps |
1200 meters |
| 9600Bps |
800 meters |
| 19200Bps |
600 meters |