Prerequisites

Everything you need for implementation

• Sercomm NA502(s) gateway with the cover/housing removed
• computer device with an Ethernet and serial TTL connection
• TFTP server and Console Client running on your computer
• 3-pin serial connection to the unpopulated 4-pin solder pads near the LEDs
  • with the front of the device facing you, the pinout is as follows: GND - TXD - n.a. - RXD
  • the serial interface settings are 57600 8N1
• direct LAN cable connection between computer and gateway
  • It is the safest to
    • manually assign your computer an IP address in the 192.168.1.x range, eg. 192.168.1.100
    • enter 192.168.1.1 for the router and
    • use 255.255.255.0 as the network mask

The above was created on the basis of information from OpenWrt.org and expanded accordingly.

Illustrations of the hardware tools used

The Solder Pads of the NA502(s) The TTL Adapter The wired connection

• If the TTL connection is established when switching power on and NO MESSAGES are visible on the console, disconnect the TTL connection and restart the gateway without a TTL connection.
• When the gateway has completed the boot process, establish the TTL connection and then press the reset button.
• The gateway should now restart and a series of messages should now be visible.