Tiny Serial-to-Ethernet Device ServerCopyright © 2016 ICP DAS CO., Ltd. All Rights Reserved. - 14 -2.4 Appearance4. Operating Mode SwitchInit Mode: Configuration modeRun Mode: Firmware operation modeFor tDS-700 series modules, the operating mode switch is set to the Runposition by default. In order to update the firmware for the tDS-700 seriesmodule, the switch must be moved from the Run position to the Initposition. The switch must be returned to the Run position after the updateis complete.Front View 1. Robust Insulated and Fire-retardant Case2. Serial COM PortsThe number of serial COM Ports availabledepends on the type of tDS-700 seriesmodule. For more detailed informationregarding the pin assignments for theSerial COM ports, refer to Section 2.6 PinAssignments.3. S1: System LED indicatorOnce power is supplied to the tDS-700series module, the system LED indicatorwill illuminate. An overview of the LEDfunctions is given below:Function System LED BehaviorRunning Firmware Steady ONNetwork Ready Slow flashing –Once every 3 secondsSerial Port Busy Rapid flashing –Once every 0.2 seconds