GSM remote control for repeater
GSM remote control for radio repeaters
The RCU-8951 GSM REMOTE CONTROL, in the rack version for repeater control, is managed by a powerful latest generation microcontroller, integrated by an industrial GSM / GPRS modem equipped with an RS232C serial port and allows you to operate up to 8 remote electrical power loads, by simply sending an SMS from a mobile phone. THE REMOTE CONTROL is equipped with a 4x20 LCD module with LED backlight for the detailed display of all the operating phases and messages received by the modem and allows the reading of 8 voltage analog inputs (0 ... 3 V) with a resolution of 10 bit, dedicated to the acquisition from remote sensors and transducers, for example of temperature, humidity, liquid level, pressure, etc. It is possible to pre-set up to 8 alarms generated by the exceeding of minimum and maximum thresholds, both for voltages and temperatures. There are also 8 TTL digital inputs, whose status change (of one or more inputs) determines the sending of an alarm SMS, with reading of the status of all the inputs.
The management of analog and digital alarms is very complete and allows a precise remote analysis of the conditions of the controlled environment. An alarm cycle is generated when the preset threshold, in temperature or voltage, is exceeded and the alarm status is stored on EEPROM; if and when the sensor reading returns to the normal state, ie within the predetermined limits, there is a second cycle of alerts (SMS or calls) to signal the return from the alarm state. The digital alarms, managed in polling mode, are generated by the opening of a normally closed line to ground and are equipped with a delay that can be set from 0 to 255 s, within which no alarm is generated, but only the display of the pre-alarm status. of the stub on the LCD. Once the set delay has been exceeded, an alarm cycle is generated with event storage; if and when the line is closed to ground, there is a new SMS signaling the return from the alarm status. There is also an alarm line managed by interrupt with a very rapid response (10 ms), suitable for alarm sensors that have an impulse output with a very short impulse duration.
THE RCU-8951 REMOTE CONTROL automatically sends a call or, optionally, a confirmation SMS to the calling mobile phone if a valid command is received from a previously registered user, while unrecognized SMS or sent by unauthorized users are ignored and deleted and stored with the initial activation procedure; SMS containing a valid command are automatically executed and deleted from the SIM.
The output relays are of the single-pole 2-way switch type (SPDT) and therefore have 3 contacts each: common (COM), normally open (NO) and normally closed (NC), brought back to the 12-pole terminal block accessible on the control board. I. The maximum switchable power on resistive load is 2500 W. The quality standard of the product is industrial grade and its applications are innumerable and in general the remote control finds application in all cases where it is necessary to remotely control electrical loads and receive a feedback from ON-OFF sensors and readings from remote physical size transducers. The typical fields of application of the RCU-8951 REMOTE CONTROL are the remote activation of boilers, air conditioners, lighting, irrigation systems, anti-theft systems, etc. and the opening of motorized doors and gates, as well as the control of remote environments, with the possibility of receiving alarms generated by environmental sensors and reading sensors and transducers. The RCU-8951 REMOTE CONTROL manages the program variables on the EEPROM memory to ensure the maintenance of the parameters and user data even in the event of a power failure.
Local automatic regulation ON-OFF
The RCU-8951 REMOTE CONTROL has autonomous functions of automatic ON-OFF adjustment; by enabling the appropriate user parameters, stored on the EEPROM, it is possible to implement a regulator that controls up to eight relays, according to the relative 8 temperatures or input voltages, by prefixing the minimum and maximum set-point thresholds. To optimize the regulation and avoid oscillations around the threshold value, two hysteresis corrective factors are available, low and high, which can be set by the user.The default value set in the factory is fixed at the value of 5% (ISTlow = 0.95, ISThigh = 1.05). The enabling of the various alarms is carried out by writing the appropriate parameters in the relative EEPROM locations, indicated in the following paragraphs. The command used is WB (initials of Write Bit), to write the individual enable / disable bits.
ON-OFF regulation with minimum temperature threshold
It is possible to set up to 8 minimum temperature thresholds with hysteresis;
