Custom OpenWrt-RM04 8/32Mb Module
Description
Custom HLK-RM04 module
This Custom OpenWRT RM04 module with default 8 Mb flash memory and 32Mb ram is our most advanced module available with custom OpenWrt options. This pre installed and/or configured OpenWrt image for the HLK-RM04 module can be customized to meet every business or industrial need for serial or Uart communications.
We also provide cloud solutions to make your application available in a very low cost cloud based solution. Securely connect your Uart / Serial devices to a Datacenter and make them accesable to whom and where you want.
Default configurations, extra installed packages that will survive factory resets and allow for quick deployments of this highly customizable HLK RM04 module.
The current set of basic packages for this custom HLK RM04 module are;
OpenWRT Packages
| Installed packages | Package version |
| base-files | 197-r9358-ca13820d13 |
| busybox | 1.30.1-1 |
| dnsmasq | 2.80-8 |
| dropbear | 2017.75-9 |
| firewall | 2019-01-02-70f8785b-2 |
| fstools | 2018-12-28-af93f4b8-4 |
| fwtool | 1 |
| hostapd-common | 2018-12-02-c2c6c01b-1 |
| ip6tables | 1.8.2-3 |
| iptables | 1.8.2-3 |
| iw | 4.14-1 |
| iwinfo | 2018-12-25-dd508af4-1 |
| jshn | 2018-07-25-c83a84af-2 |
| jsonfilter | 2018-02-04-c7e938d6-1 |
| kernel | 4.14.101-1|dcefc33dc02fffde32568242f9896e22 |
| kmod-cfg80211 | 4.14.101+4.19.7-1-2 |
| kmod-eeprom-93cx6 | 4.14.101-1 |
| kmod-gpio-button-hotplug | 4.14.101-2 |
| kmod-ip6tables | 4.14.101-1 |
| kmod-ipt-conntrack | 4.14.101-1 |
| kmod-ipt-core | 4.14.101-1 |
| kmod-ipt-nat | 4.14.101-1 |
| kmod-ipt-offload | 4.14.101-1 |
| kmod-leds-gpio | 4.14.101-1 |
| kmod-lib-crc-ccitt | 4.14.101-1 |
| kmod-lib-crc-itu-t | 4.14.101-1 |
| kmod-mac80211 | 4.14.101+4.19.7-1-2 |
| kmod-nf-conntrack | 4.14.101-1 |
| kmod-nf-conntrack6 | 4.14.101-1 |
| kmod-nf-flow | 4.14.101-1 |
| kmod-nf-ipt | 4.14.101-1 |
| kmod-nf-ipt6 | 4.14.101-1 |
| kmod-nf-nat | 4.14.101-1 |
| kmod-nf-reject | 4.14.101-1 |
| kmod-nf-reject6 | 4.14.101-1 |
| kmod-ppp | 4.14.101-1 |
| kmod-pppoe | 4.14.101-1 |
| kmod-pppox | 4.14.101-1 |
| kmod-rt2800-lib | 4.14.101+4.19.7-1-2 |
| kmod-rt2800-mmio | 4.14.101+4.19.7-1-2 |
| kmod-rt2800-soc | 4.14.101+4.19.7-1-2 |
| kmod-rt2x00-lib | 4.14.101+4.19.7-1-2 |
| kmod-rt2x00-mmio | 4.14.101+4.19.7-1-2 |
| kmod-slhc | 4.14.101-1 |
| libblobmsg-json | 2018-07-25-c83a84af-2 |
| libc | 1.1.21-1 |
| libgcc1 | 7.4.0-1 |
| libip4tc0 | 1.8.2-3 |
| libip6tc0 | 1.8.2-3 |
| libiwinfo-lua | 2018-12-25-dd508af4-1 |
| libiwinfo20181126 | 2018-12-25-dd508af4-1 |
| libjson-c2 | 0.12.1-3 |
| libjson-script | 2018-07-25-c83a84af-2 |
| liblua5.1.5 | 5.1.5-2 |
| liblucihttp-lua | 2019-01-24-1afbdcc3-1 |
| liblucihttp0 | 2019-01-24-1afbdcc3-1 |
| libnl-tiny | 0.1-5 |
| libpthread | 1.1.21-1 |
| libubox20170601 | 2018-07-25-c83a84af-2 |
| libubus-lua | 2018-10-06-221ce7e7-1 |
| libubus20170705 | 2018-10-06-221ce7e7-1 |
| libuci20130104 | 2018-08-11-4c8b4d6e-2 |
| libuclient20160123 | 2018-11-24-3ba74ebc-1 |
| libxtables12 | 1.8.2-3 |
| logd | 2018-12-18-876c7f5b-1 |
| lua | 5.1.5-2 |
| luci | git-19.046.56017-7f791e9-1 |
| luci-app-firewall | git-19.046.56017-7f791e9-1 |
| luci-app-opkg | git-19.046.56017-7f791e9-1 |
| luci-app-ser2net | git-19.046.56017-7f791e9-1 |
| luci-base | git-19.046.56017-7f791e9-1 |
| luci-lib-ip | git-19.046.56017-7f791e9-1 |
| luci-lib-jsonc | git-19.046.56017-7f791e9-1 |
| luci-lib-nixio | git-19.046.56017-7f791e9-1 |
| luci-mod-admin-full | git-19.046.56017-7f791e9-1 |
| luci-mod-network | git-19.046.56017-7f791e9-1 |
| luci-mod-status | git-19.046.56017-7f791e9-1 |
| luci-mod-system | git-19.046.56017-7f791e9-1 |
| luci-proto-ipv6 | git-19.046.56017-7f791e9-1 |
| luci-proto-ppp | git-19.046.56017-7f791e9-1 |
| luci-theme-bootstrap | git-19.046.56017-7f791e9-1 |
| mtd | 24 |
| netifd | 2019-01-31-5cd7215a-1 |
| odhcp6c | 2019-01-11-d2e247d8-16 |
| odhcpd-ipv6only | 2019-01-16-0a367680-3 |
| openwrt-keyring | 2018-05-18-103a32e9-1 |
| opkg | 2019-01-31-d4ba162b-1 |
| ppp | 2.4.7.git-2018-06-23-1 |
| ppp-mod-pppoe | 2.4.7.git-2018-06-23-1 |
| procd | 2018-12-27-e2b055ed-1 |
| rpcd | 2018-11-28-3aa81d0d-1 |
| rpcd-mod-rrdns | 20170710 |
| ser2net | 3.5.1-1 |
| swconfig | 12 |
| ubox | 2018-12-18-876c7f5b-1 |
| ubus | 2018-10-06-221ce7e7-1 |
| ubusd | 2018-10-06-221ce7e7-1 |
| uci | 2018-08-11-4c8b4d6e-2 |
| uclient-fetch | 2018-11-24-3ba74ebc-1 |
| uhttpd | 2018-11-28-cdfc902a-2 |
Conclusion
For the rest this unit has 2 working Uart ports, working WAN and LAN port, default opkg installable packages.
This unit is not suitable for attaching RJ-45 connectors or RS232 connector. For a solution to directly attach a cable please see our kits which include a development board for attaching cables and connectors to the HLK-RM04 unit.
We also provide solutions for developing a custom build development board that can suit every need.
Default specifications
HLK-RM04 is a low-cost embedded UART-ETH-WIFI module (serial port – Ethernet – Wireless network) developed by Shenzhen Hi-Link Electronic co., Ltd. The HLK-RM04 is an embedded module based on the universal serial interface network standard.
Built-in TCP / IP protocol stack, enabling the user serial port, Ethernet, wireless network (wifi) interface between the conversions. Through the HLK-RM04 module, the traditional serial devices do not need to change any configuration; data can be transmitted through the ethernet providing a quick solution for the user’s serial devices to transfer data via ethernet.
1.Summarize
Technical Specifications
| Network standard | wireless：IEEE 802.11n IEEE 802.11g IEEE 802.11b |
| wired：IEEE 802.3 IEEE 802.3u | |
| Wireless transmission rate | 11n: maximum up to 150Mbps 11g: maximum up to 54Mbps 11b: maximum up to 11Mbps |
| Tracks number | 1-14 |
| Frequency range | 2.4-2.4835G |
| Emission power | 12-15DBM |
| Interface | 10/100Mbps LAN/WAN multiplex interface interface |
| Antenna | |
| Antenna type | optional External Antenna |
| Functional Parameters | |
| WIFI work mode | Client/AP/Router |
| WDS Function | Support WDS wireless bridge connection |
| Wireless security | MAC address filtering (wireless) |
| Wireless security function switch | |
| 64/128/152 bit WEP encryption | |
| WPA-PSK/WPA2-PSK、WPA/WPA2 security mechanism | |
| Network management | Remote Web management |
| Configuration file import and export | |
| WEB software upgrade | |
| Serial to Network | |
| Maximum transmission rate | 230400bps |
| TCP connection | Max connection number>20 |
| UDP connection | Max connection number>20 |
| Serial baud rate | 50~230400bps |
| Other Parameters | |
| Status indicator | Status indicator |
| Environmental standard | Operating temperature：-20-70℃ |
| Operating humidity：10%-90%RH | |
| Storage temperature：-40-80℃ | |
| Storage humidity：5%-90%RH | |
| Additional properties | Frequency bandwidth optional：20MHz40MHz ,Auto |
2.Hardware Explanation
Mechanical Dimensions
3. Pin Interface for our Custom OpenWRT RM04 module
The Pins of the hlk-rm04 are as shown below
| Number | Function | Direction | Explanation |
| 1 | VCC | Power in | 5V Power supply input |
| 2 | GND | GND | Power ground |
| 3 | WLAN led | O | WiFi startup indicator (Valid on high level) |
| 4 | VDD | Power out | 3,3V Power output |
| 5 | Link2 | O | Net port 2 connection indicator (Valid on lower level) |
| 6 | USB_P | I/O | USB signal + |
| 7 | USB_M | I/O | USB signal – |
| 8 | STA/GPIO_0 | I/O | Status indicator GPIO_0 (Valid on lower level) |
| 9 | GPIO_1 | I/O | GPIO_1 |
| 10 | ES/RST | I | Exit transparant transmission mode/restore factory values |
| 11 | TXOP2 | A | Net port 2 TX-P |
| 12 | TXON2 | A | Net port 2 TX-N |
| 13 | RXIP1 | A | Net port 1 RX-P |
| 14 | RXIN1 | A | Net port 1 RX-N |
| 15 | RXIN2 | A | Net port 2 RX-N |
| 16 | RXIP2 | A | Net port 2 RX-P |
| 17 | TXON1 | A | Net port 1 TX-N |
| 18 | TXOP1 | A | Net port 1 TX-P |
| 19 | RTS_N/GPIO_2 | I/O | UART 2 RTS |
| 20 | UART_RX | I | UART 1 RX |
| 21 | UART_TX | O | UART 1 TX |
| 22 | RXD/GPIO_3 | I/O | UART 2 RX |
| 23 | LINK1 | I/O | Net port 1 connection indicator (Valid on lower level) |
| 24 | CTS_N/GPIO_4 | O | UART 2 CTS |
| 25 | WPS/RST | I | WPS button / restore factory values |
| 26 | TXD/GPIO_5 | O | UART 2 TX |
| 27 | VDD_1_8 | Power out | Net port 1.8V output |
| 28 | VCC | Power in | 5V input |
4. Electrical Characteristics for our Custom OpenWRT RM04 module
Exceeding these conditions will result in damage to the device.
| Parameter | Min | Max |
| Module supply voltage VCC | 3.9V | 5.5V |
| Module Voltage Output VO3.3 | 3.1V | 3.5 |
| Module Voltage Output VO1.8 | 1.65V | 1.9 |
| GPIO Voltage | 3.1V | 3.5V |
| Storage temperature | -40ºC | 95ºC |
Additional information
| Brand | Hi-Link |
|---|---|
| mpn | Not available |
1 review for Custom OpenWrt-RM04 8/32Mb Module
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Anonymous (store manager) –
Build and delivered as requested.