Table 1.
Summary of the technical features and functioning of each subsystem of the new electronic control system.
| Module Name | Technical Features | Functioning |
|---|---|---|
| Raspberry Pi 2 (Model B) | - 900 MHz quad-core ARM Cortex-A7 CPU; - 1 GB RAM; - Ethernet port; - 4 USB ports. |
Core of the new control system. |
| Arduino UNO REV3 | - 16 MHz ATmega328P; - UART, I2C, SPI; - USB port. |
Each microcontroller manages one block of the new control system. |
| Mixer Biasing Block | - I/O Voltage: 5 V, 12 V, 15 V; - 16-bit resolution ADC ADS1115. |
Manage the IRAM Junction Bias board for the SIS mixer biasing. |
| Mixer Tuning and Receiver Calibration Block | - I/O Voltage: 5 V, 12 V, 15 V; - 16-bit resolution ADC ADS1115. |
Composed of the SIS mixer backshort motor control board for the mixer tuning, and the receiver calibration motors control board for the receiver calibration. |
| Monitoring and Control Boards for the ALMA Local Oscillator Block | - I/O Voltage: +6 V @ 1.5 A, ±15 V @ 500 mA; - 16-bit resolution ADC ADS1115; - SPI bus. |
Composed of two modules: one for managing the AMC and the other for controlling the PA of the ALMA local oscillator. |