Instructions

13.56 MHz Modbus-RTU RFID Reader QU-950-4-HF User Manual
Quick Ohm Küpper & Co. GmbH
QUIO ®
5
5. MODBUS-RTU
The MODBUS protocol defines a simple protocol data unit (PDU), which is
independent of the underlying communication layer. MODBUS protocol mapping on
a particular bus or network can introduce some additional fields on the application
data unit (ADU). General Modbus frame as shown below.
(Figure 1 Modbus Protocol package)
5.1 Modbus-RTU Protocol
The QU-950-4-HF RFID reader supports many bauds, the default baud rate is
19200, N, 8,1.
5.1.1 PLC Send：
Device ID
Function Code
Data
CRC16
1 byte
1 byte
N byte
2bytes(LSB)