User's Manual

HF-A21-SMT Embedded WiFi Module User Manual

Shanghai High-Flying Electronics Technology Co., Ltd

www.hi-flying.com

When right side HF-A21-SMT boot up, it will find wireless AP (SSID：HF-A11x_AP for this

example) and open TCP/Client network protocol to connect with left side module‟s TCP/Server.

All these operation will be automatic and after finished, the two user devices connected to HF-

A21-SMT module through serial port can communicate each other and think the connection

between them is fully transparent.

3.3.4. Wireless Data Acquisition Card Application

For this wireless data acquisition card application, one PC works as data server and every data

acquisition card connects with a HF-A21-SMT module to support wireless connection function.

Figure 37. Wireless Data Acquisition Card Application

As above figure, one HF-A21-SMT configured as AP mode and all others configured as STA

mode. All HF-A21-SMT which configured as STA and data server PC wireless connected to HF-

A21-SMT which configured as AP to make up a wires network.

Data server PC open TCP/Server protocol and all HF-A21-SMT modules open TCP/Client

protocol. All data acquisition cards‟ data and sampling information can be transmitted to data

server PC for operation.