Do you need a Remote control for your system?: it's easy, using our IR remote control receiver RMT32. You can use commercial TV remote control or custom code r.c. - Output received code on parallel and/or serial port.
A remote control ::
In many electronic systems in which an interaction exists from man to machine, first optional required is a wireless remote control, to facilitate the repetitive operations , which obligate him to go near an operating panel, or to behind a portable terminal with along how much a noiser cable. .
TV remote control :
the great diffusion of the I.R. remote controls for TV application reduced the price remarkablly, and has carried the companies manufacturers to increase the performances. Various models of remote controls for TV are accepted from RMT32 system, and the relative heads.
it's easy to have range up 8 meters,in atmospheres normally illuminated, and beyond, in atmospheres in penumbra, or with lighting system that do not hit the receiving head directly. .
If a key of the remote control is pressed for a short time a code is transmitted but it containing only a burst that code the key. If the key " feels " a long pressure , we have an automatic repetition of the code every 115 msec. approximately, that it is equivalent to approximately 8 burst at second. This second mode, that we can name autorepeat, is a lot important in how much concurs drives " in emergency ", that they only can be maintained valid until arrive some codes. .
Decode of data:
the microcontroller (Motorola 6805 series ) to which interface receiving head (LITEON), is provided to decode the burst and if it match it like a valid code, it transmits on a serial line some bites that they can as an example usefully be used from host (personal a computer) that through an opportune software communicates to our system the several actions to undertake. .
the decoded data are available on 8 bit parallel port, in TTL level. ^ bits are the code of pressed key, 1 bit is toggle bit, and 1 bit is the flag of pressed key( or data ready).
the data-codes are transmitted at 4800 baud, and the protocol previews exclusively characters ascii for one easy diagnostic through a common TERMINAL connected to the receiver. Two various ways exist in which the characters ascii they come composed and transmitted: one to low level, that it previews the transmission of whichever data received from the head, and one to elevated level that it transmits only the thought codes valid. The chosen type of interface for the serial line is the RS485, that it concurs advanced lengths of connection much with the RS232 (we arrive to 1200 meters of cable), and high noise immunity. This performance obligates to us to use a converter from RS485 to RS232 if we use a p.c. like host, entering therefore in one COM standard. .
the receiving head is physically detached from the circuit microcontroller, for a comfortable installation , and the two sections (head and microcontroller) are connected from one small local network, also standard RS485. .
you can interface the receiver at your system, but if you cant' , for unavailable input bits, we have an expansion card with 8 relays, that you can join directly to RMT32 receiver.
Software Visual Basic:
Is available an example VB soure program, that you can download and modify for a fast start, to use RMT32 receiver. The code is freeware..
Special CODES : :
if you want, our partners can provide to you, remote control units with a custom special code, to avoid inteferences from commercial TV r.c..