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The G021 CONTROL LOGIC manages the transmitter functioning and makes available the information on its functioning status to the operator. The unit is self-contained and arranged into a 19 inchs frame designed in order to tolerate mechanical stresses. The central processing unit is based on a H8/3003 microprocessor (16 MHz clock) that can be considered like a Master of the distribuited control system. The information is displayed on a graphic LCD display and is recalled by means of a numeric keyboard (F1 to F6). Four programming pushbuttons (START, STOP, LOCAL, REMOTE) allow to switch-on/to stop the transmitter and to set the functioning mode. The managing is performed via a POLLING software which tests three peripheral assemblies located in the DETECTORS/INTER- FACE group for Driver section, and in the HV LEVEL POWER SUPPLIES and FOCUS POWER SUPPLY . I.O.T. DETECTOR, for the RF Power Amplifier section. The peripheral assemblies are identical and D.A.I. type (Data Acquisition Interface). The D.A.I. are pre-programmed units, provided with microprocessor; each of them allows to manage 8 digital inputs, 8 digital outputs (by means of opto.isolators) and 8 A/D converter lines with 12 bit resolution and input voltage range from -5 V to +5 V. The peripheral assembly located in the HV LEVEL POWER SUPPLIES also allows the managing of a double digital/analog converter needed for trimming the grid and filament voltages. Each peripheral assembly has a HW address and is connected to a local acquisition assembly (within the G021) via an optical plastic wire. Data rate allowed is up to 40 kBaud. In order to save the transmitter, if any fault occurs to the optical fiber, the slave unit also stops the subassemblies monitored if no data confirmation is riceved from the G021, at the same time the G021 starts the stop procedure for the transmitter. The local acquisition assembly D.L.I. (Data Local Interface) receives the information coming from the outside and sends it to the CPU.16 MASTER, where the transmitter managing program is stored. Any fault in a D.A.I. peripheral assembly is displayed as an error indication on the graphic display; the indication is "ERROR PERIPHERAL No. ....." If this occurs, the G021 stops the transmitter. A reset procedure is also memorized in order to restart the transmitter. The transmitter functioning can be restored by means of the RESET function in the PROGRAM menu or the RESET function of the SYSTEM STATUS menu in the TUBE MEASURES menu.
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Data Acquisition Interface (D.A.I.) The peripheral Data
Acquisition Interface assembly is carried out on eurocard dimension
(100x160) PCB. The SMD technology is used for assembling part of
components; the PCB is multi-layer (6 layers) and treating against high
voltage discharge is employed. The voltages power supply needed for
differential amplifers are � t�12 V and a +5 V voltage is required for the
CPU power supply (200 mA max.); all of the circuits under high voltage
have a galvanic insulation. Telesignals and telecontrols are available
outside on a STRIP connector (64 pins). The serial communication interface
is carried out by means of bipolar optical fibers with Tx and Rx units
working at 40 kBaud rate. The optical fibers employed are plastic type
which allow connections up to 20 m. The peripheral Data Acquisition Interface assembly also has the following features:
Data Local Interface (D.L.I.) The peripheral Data Local Interface assembly is carried out on eurocard dimension (100x160) PCB. The Data Local Interface features are:
Security features for telecontrol An high grade of security has been achieved for this telecontrol system which allows the manag- ing of several peripheral units located in dangerous areas for personnel. This is done by means of hardware and software protections as follows:
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