1. Introduction
HLK-RM08K is a new low-cost embedded UART-ETH-WIFI module (serialport - Ethernet - Wireless network) developed by Shenzhen Hi-Link (HK) co., Ltd.
The product is a low power consumption WIFI module,supports EEE802.11b/g/n wireless protocol with small size and smart use,ully transparent transmission UART module, built-in TCP / IP protocol stack, enabling users short development cycle. It just needs host computer,WEB browser or APP to set up parameters, making the connection between UART and network.
HLK-RM08K
has stable performance and flexible use, meeting kinds ofrequirements of users. and strong technical supports could be provided. Also, it could be customized,such as WEB interface ,mobile phone app and so on.
2. Hardware Explanation
2.1 Meachanical Dimensions
Note：pitch of holes 2.0mm, pitch of holes 0.7mm.
Dimensions：40mm(length）X 29mm(width ) X 2.9mm(height)
2.2 Pin Definitions
ES0 Function Introductions ：
1. After System boot, ES0 keep the lower level time 0.05s<t<6s, Serial 0 exittransparent transmission.
2. After System boot, ES0 keep the lower level time 6s<t<12s, client settingsreset.
3. On electic ES0 is a lower level, the lower level time 6s<t<12s, client settings reset.
ES1 Function Introductions
：
1. After System boot, ES1 keep the lower level time 0.05s<t<6s, Serial 1 exittransparent transmission.
2. After System boot, ES1 keep thelower level time 6s<t<12s,factory reset.
Parameter storage :
RCFG：The parameters in the memory.
SCFG
：
General parameters.
CCFG
：
Save To C Instructions to save parameters.
FCFG
：
Factory factory Settings. Users can't modify.
1. Power on
，
module read SCFG to RCFG from flash.
2. Save instructions RCFG to SCFG.
3. Restore settings
，
copy CCFG to SCFG.
4. Save To C Save instructions RCFG to CCFG.
5. Factory resetting
，
copy FCFG to CCFG.
2.3 Typical Reference Design
2.3.1 Uart to Ethernet
2.3.2 Usrt to WIFI (AP or STA)
3. Technical Specification
4. Detailed Functions
4.1 Uart Mode
4.1.1 Uart to Ethernet
In this mode，ETH0（WAN port）enabled. Closed.
Ethernet could configure as dynamic IP ( DHCP ) ,also could configure as static IP(static).
4.1.2 Uart to WIFI STA
In this mode, WIFI enabled
，
working in STA mode, Ethernet closed.
WIFI STA could configure as dynamic IP (DHCP), also configure as static IP(STATIC).
4.1.3 UART to WIFI AP
In this mode, WIFI enabled, working in AP mode, Ethernet closed.
In this mode, WIFI device could connect module, as one working in WIFI local area net.
4. 2 Network Mode
4.2.1 Gateway Mode(Defaul Mode)
In this mode, module connects router by WAN, Module’s WAN IP can be set to automatically obtain IP ( static DHCP),
Module’s 4 LAN port could connect PC directly, PC can directly obtain IP addresses from module;
Module acts as AP now, clients could connect its WIFI directly.
4.2.2 Pepeatar Mode
In this mode, module connects AP with WIFI and emission WIFI itself, mobile phoneand other clients could connect its WIFI directly. Meanwhile, five ETH ports are LAN,PC and other devices could connect module with Ethernet cable.
Note : The client(such as mobile phone,PC)’IP address is assigned by AP once
connected module, Module is functioned as PBX.
