The remote electric tilting device (RET) can accurately control the tilt of the antenna without site access requirements. It supports remote adjustment of the tilt angle from the base station / network control center, and can be completed in a few moments. This can promptly and accurately respond to changing network capacity requirements. The solution includes a motor-driven antenna (which communicates with BTS via RS-485) and a microprocessor that can control communication and perform monitoring functions. Most RET systems use the AISG protocol (antenna interface standard group), which is an open standard for the control interface of these systems. The TI MSP430 processor family is ideal for processors that perform all monitoring and sorting functions. The integrated high-performance analog block provides high accuracy for applications that require precise measurement and monitoring. MSP430 features high performance, flexibility, and a variety of peripheral options, enabling applications to be implemented faster and at lower cost with less code and power consumption. The integrated stepper motor driver solution has two H-bridge drivers and microstepper indexer logic that controls the stepper motor. Each output driver block contains an N-channel power MOSFET configured as a full H-bridge to drive the motor winding. Simple step / direction interface can be easily connected to the controller circuit. The pins support configuring the motor in full step, half step, quarter step or eighth step mode. Both the decay mode and PWM off time are programmable. The internal shutdown function provides over-current protection, short-circuit protection, under-voltage lockout and over-temperature protection. TI has a complete set of power solutions, namely linear regulators, buck regulators and DC / DC converters for RET units, which can reduce the power rail to any intermediate energy that can power all other on-board chips. level. The implementation of surge limiting can limit the inrush current transferred to the circuit board at startup. TI hot-swap controllers can be used to smoothly control the pull-up voltage and current.
TDC2000 systems have been in operation for more than 25 years and will be supported by Honeywell in the future. However, ageing workforce and a greater demand for energy savings, environmental protection and improved operational effectiveness require users to look closely at different solutions for technology refresh and upgrades.
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