Notice MARMITEK XM10

« product or when the product is used for purposes other than specified. Marmitek does not accept responsibility for additional damage other than covered by the legal product responsibility. How to implement Two - way PLC interface for OEM applications (XM10) The XM10 is a transmitter-receiver that plugs into a regular AC outlet and connects to the controller via a modular RJ 11 telephone jack. Alternatively, the XM10 may be fitted inside the controller cabinet, connected to the 230 V AC supply before the power transformer. (This would be a typical installation with most security panels.) It provides an opto-coupled 50 Hz. Square wave, synchronised to the zero crossing point of the AC line. The controller generates X-10 compatible codes synchronised to this zero crossing point. The two-way interface then couples the X-10 codes onto the AC line. Two - Way transmission available The two-way interface transmits and receives X-10 codes. It enables an O.E.M. to develop a system to control X-10 Modules, and receive X-10 signals from remote sensors (P.I.R. motion detectors for example) X-10 Code transmission To transmit X-10 signals the controller must supply 1 ms .envelopes. to the TX input of the interface with respect to common. These envelopes must be as close as possible to the zero crossing point of the AC line (see timing diagrams). An opto- coupled output representing the zero crossing point of the power line is provided for the controller to which X-10 codes are to be synchronised. X-10 Code reception The two-way interface uses a custom proprietary I.C. to read X-10 codes from the power line. This takes a lot of burden off the microprocessor in the controller as it does not have to continuously monitor the powerline and check all in coming signals (and noise) for validity. Any signals applied to the controller are error-checked, valid X-10 codes. When a valid X-10 code is received, it is stored in the custom I.C. and - 1 - X-10 protocol for the Marmitek XM10 OEM Controller applied (in envelope form) to the controller. This output is coincident with the second X-10 transmission. (X-10 codes are always transmitted in groups of two, except for Bright and Dim.) Data sent to the controller is valid X-10 data. The start Code (1110) can be used to alert the controller that an X-10 Code will follow. A .1. bit from the two-way interface appears as a negative going pulse 1.1 ms long, beginning approximately 100 µs after zero crossing. The controller should sample this data between 500 and 700 µs after zero crossing. The L.E.D. on the two-way interface gives a visual indication that X-10 codes are being received. The L.E.D. is illuminated when AC power is applied to the two-way interface and blinks off when X-10 codes are received. The two-way interface will also receive the codes it transmits, therefore the L.E.D. will also give an indication of codes being transmitted. The ability to read X-10 codes from its own output also allows the controller to incorporate data collision detection. If the code received differs from the code transmitted, the code can be assumed to have been corrupted by noise ( or another transmission ) on the power line. The line Monitor capability of the two-way interface allows the controller to ensure that the power line is free from X-10 signals before starting a transmission. This means that in a multitransmitter system the controller can... »