Data Link Module
The Microhard Data Link is not for sale anymore.
This page contains the relevant documentation for existing Microhard Data Links deployed in the field.
Connectors
ID
Name
Connector
Description
J1
USB
USB Type-C
pMDDL USB interface (pins 18 and 19)
J2
Ethernet
JST GH 4-pin
SM04B-GHS-TB
pMDDL LAN interface (pins 55 to 58), 100Base-T
J3
UART
JST GH 6-pin
SM06B-GHS-TB
pMDDL Serial interface (pins 28, 29, 31 and 34)
J51
POWER
Molex Micro-Fit 3.0 0436500210
Power supply input, 6.4V - 30V
Antenna
RP-SMA
Fan
JST GH 2-pin
5V connector to attach a fan for cooling
Pinouts
USB (J1)
Please refer to the official pinout specification for USB Type-C connectors. The connector supports USB High-Speed (up to 480 MBit/s) data rates.
Ethernet (J2)
Pin
Name
Dir
Lvl
Function
1
ETH_TD_P
OUT
3.3V
Transmit + (Diff.)
2
ETH_TD_N
OUT
3.3V
Transmit - (Diff.)
3
ETH_RD_P
IN
3.3V
Receive + (Diff.)
4
ETH_RD_N
IN
3.3V
Receive - (Diff.)
UART (J3)
Pin
Name
Dir
Lvl
Function
1
NC
Not connected
2
RXD
IN
3.3V
pMDDL RXD
3
TXD
OUT
3.3V
pMDDL TXD
4
RTS
IN
3.3V
pMDDL RTS
5
CTS
OUT
3.3V
pMDDL CTS
6
GND
Ground
Power (J51)
Pin
Name
Dir
Lvl
Function
1
GND
Ground
2
VIN
6.4V - 30V
Power Input
Recovery Procedure
The radio modules included in the Skynode Evaluation Kit are already configured and in a pre-paired state, no further configuration is required. The following steps can be used to recover the factory pre-paired state or to configure a set of Microhard modules that is not already setup.
Loading default pre-paired configuration
Connect the radio module to your computer or laptop following the wiring diagram below and power on the module. Even when you need to recover both radio modules, connect only one of them at a time and repeat this procedure afterwards for the other module.
Reset the radio module to factory defaults following the instructions under Factory Reset.
Verify that the Ethernet port of the computer or laptop is configured as a DHCP client.
Wait until the Ethernet connection is established and an IP address has been assigned.
Open your internet browser and navigate to the following URL: http://192.168.168.1/. This connects to the radio module's local web interface. The default login is Username: admin Password: admin
After logging in change the admin password as requested. This password will be overwritten again when we load the configuration file in the next step.
For your convenience we are providing configuration files for the Microhard Radios. Download the configuration files. The archive contains two configuration files, one for the AIR unit and one for the GROUND unit. The AIR unit is the module that is typically connected to Skynode, and the GROUND unit is typically connected to your desktop computer or laptop.
In the Microhard web interface, navigate to System > Maintenance and under Restore Configuration click Choose File. Select the correct configuration file from the previously downloaded archive and upload it.
Click on Check Configuration File.
After the configuration has been verified successfully click Restore and wait until the update is complete. This step also changes the configuration password to "auterionfct". You must change it back to "admin", even if the configuration GUI complains about it.
Repeat the same process for the second unit. pairing will only work if both AIR and GROUND unit have their respective configuration loaded!
Configuration Files
Wiring during Configuration
Factory Reset
The modules have to be configured as AIR and GROUND unit afterwards. One method for doing so is explained above.
Power the Microhard using the power module and the wall power supply or a battery.
Wait until the Microhard is fully booted. Booting takes about 60-75 seconds, and is complete when the three RSSI LEDs (D7,D8 and D9) indicated below start lighting up in a "walking sequence" (i.e. LEDs are active one after another, in a continuous cycle).
​Press and hold the Config Button by inserting a pointy tool such as a paper clip. Once the CPU Status LED begins to flash, keep pressing the button for more than 10s. The module will reboot after you release the button, this takes again about 60-75 seconds.
​
The module is now reset and can be configured for the use with Skynode. You must configure it to be an AIR or GROUND unit now by loading the configs prior to being able to use it.
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