User's Manual

User Manual of HC-42 Bluetooth Serial Port Communication Module G
athering information and Carrying Dreams
Website：
http://www.hc01.com
Guangzhou HC Information Technology Co., Ltd
Address: Room 608, No.19, Jiangong Road, Tianhe Science Park, Tianhe District, Guangzhou City, Guangdong Province
Technical customer service QQ: 445253184 Sales hot line: 020-8408-3341
PAGE
4
1.4 Products
Model
Communica
-tion protocol
Operating
frequency
Communica
-tion range
Air
data rate
Dimensions
Embedding
mode
Features
HC-
42 Bluetooth 4.0 2.4G 40m 1Mbps 26.9*13*2mm SMT BLE low power
consumption
HC-02 Bluetooth 2.0 2.4G 10m 2Mbps 26.9*13*2mm SMT Dual-mode Bluetooth
HC-05 Bluetooth 2.0 2.4G 10m 2Mbps 26.9*13*2mm SMT Various AT command
HC-06 Bluetooth 2.0 2.4G 10m 2Mbps 26.9*13*2mm SMT Simple AT command
2. Connection Description
2.1 Operating Principle
Note:
As shown in the figure above, the HC-42 slaver module is used together with the HC-42 master module to
replace the physical connection during full duplex communication. The equipment on the left sends UART data to
the module. After receiving UART data, the RXD port of the module automatically sends the data to the air in the
form of radio waves. The module on the right can automatically receive the data and restore the UART data
originally sent by the left device from the TXD. The same is true from right toleft.
2.2 Connection between the module and other equipment like MCU