User's Manual

HF-A21-SMT Embedded WiFi Module User Manual

Shanghai High-Flying Electronics Technology Co., Ltd

www.hi-flying.com

For above networking, HF-A21-SMT module works as AP and also the centre of this network. All

devices‟ IP address in this network shall use the same network segment with HF-A21-SMT and

they can intercommunication with this method.

2.6.2. HF-A21-SMT Ethernet Interface Networking (As STA, N-Ver)

Figure 19. HF-A21-SMT Ethernet Interface Networking (As STA, N-Ver)

For above networking, HF-A21-SMT module works as STA（Firmware is N-Version）,and

module configured as router mode. When module connect to AP, it will get wireless port IP

address from AP（For example: 192.168.1.100）.At the same time, module also form a subnet

（Default 10.10.100.254）and all devices connected to module Ethernet interface will get

assigned IP address（For example: 10.10.100.101）.So for above networking, PC1 at internal

subnet can initiate a connection to PC2 (For HF-A21-SMT works as router mode), but PC2 can‟t

active initiate a connection to PC1.

2.6.3. HF-A21-SMT Ethernet Interface Networking (As STA, Z-Ver)

Figure 20. HF-A21-SMT Ethernet Interface Networking (As STA, Z-Ver)

For above networking, HF-A21-SMT module works as STA（Firmware is Z-Version）,and

module configured as bridge mode. When module connect to AP, all devices connected to

module Ethernet interface will get assigned IP address from AP (For example:

192.168.1.101).For module works as bridge mode, it can be treated as a transparent device and

PC1, PC2 can communicate without any limit. But in this networking, HF-A21-SMT module needs

assign a static LAN IP address (For example: 192.168.1.10) if module also needs

communication with AP or configuration through web page.

2.7. Search Function for STA

When using web configuration STA Interface Setting Page, user can push “Search” button to find

surrounding AP, and find a AP to associated.

2.8. Work Mode

HF-A21-SMT modules provide two kinds of work mode: Transparent transmission mode.

Transparent transmission mode achieves a plug and play serial data port, and reduces user