The DM-Serial receives RS232 strings and converts these into eight open collector outputs. Map Mode – utilizing a single byte to set the state of all outputs. Modes 1, 2 and 3 require NO programming of the Serial Pea with the mode being chosen by jumpers, as is the number of latched, 1 sec, 2 sec or four sec pulse. 1, 2 or 4 second pulse. In the preferred form of the invention the cable is related to an auxiliary conductor and is so related as to be effective in decreasing or eliminating interference at frequencies as much as 2,000 cycles per second and is supplied with lead sheathing or a sheath of equivalent materials for the purl0 pose of lowering or eliminating interference at frequencies above about 50,000 cycles per second, the lead sheathing having applied to the outer surface thereof tape of delicate iron or other appropriate materials to dealwith frequencies between 2,000 and 50,000 cycles’per second. Four is conveniently of about 0.035 of an inch in diameter and this measurement is found to be economical in use for providing a stability circuit free from interference up to about 2,000 cycles per second.
0.01 of an inch and such a thickness is discovered to be economical and efficient in reducing interference over a range of about 2,000 to 50,000 cycles per second. This association, nonetheless, is of itself 25 discovered not to be practicable in respect of frequencies higher than 2,000 cycles per second. It’s found with a transmision system constructed in accordance with the invention, that interference will be diminished or eliminated over a frequency vary extending from very low frequencies up to some two megacycles or more. Cables of this form are employed for the ten transmission of tv signals and other signals of very excessive frequencies and it is going to be appreciated that in view of the big selection of frequencies transmitted, extending from very low frequencies-together with direct current, as much as frequenl5 cies of some megacycles, the indicators transmitted are liable to interference brought on by adjoining cables or different electric circuits or devices producing interfering indicators having a wide frequency vary. It also loops via the acquired RS232 for linking to different devices.
Fifty five of lowering or eliminating nterferenceover a large frequency vary, completely different means are associated with the cable that are effective in lowering or eliminating interference over completely different portions of the overall frequency range. According to the principle feature of the invention an electric transmission system is provided comprising a co-axial cable during which, for the purpose 55 of lowering or eliminating nterferenceover a large frequency vary, completely different means are related to the cable that are effective in decreasing or eliminating interference over completely different parts of the full frequency vary. The chief object of the current invention is to supply an improved transmission system and an improved cable to be used in such a system for the aim oi reducing or eliminating interference over a higher frequency range than that to which 5o any one of the above-mentioned methods is economically relevant. Wide frequency vary, an auxiliary conductor is wound across the central conductor to kind a balanced circuit for reducing low frequency interference and extra metallic means surrounding the auxiliary conductor for decreasing interference over the higher frequency portion of the entire frequency vary.
The invention is concerned with the transmission methods using cables comprising a central conductor which is air-spaced from a surrounding conducting sheath for the greater part of its length. One technique of reducing interference in cables of the type to which the present invention relates, requires an auxiliary conductor associated with the central conductor to constitute a balanced circuit. In this design the foil or mesh shield has a circular cross section and the inner conductor is precisely at its middle. All wires working inside this shielding layer can be to a large extent decoupled from exterior electrical fields, notably if the shield is related to a degree of constant voltage, corresponding to earth or floor. Wire wound around said sheath and connected to the centre conductor through an external circuit to kind a balanced circuit for reducing low frequency interference, a conducting sheath of lead surrounding the auxiliary conductor and internal sheath for lowering interference at high frequencies, and tape of comfortable iron utilized externally to the sheath of lead for decreasing interference at frequencies intermediate the stated low and high frequencies.
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