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+====== GCA_LM2  (SPL Serial Programmable Leds) ======
+[[english|{{  rocrail-logo-35.png}}]]
+  *  [[mgv-overview-en|The GCA modules]]
+ \\
+^^^^By Fred Jansen and Peter Giling ^^^^
+===== Description =====
+This a very nice and cheap way to switch leds on and off, with a timing included in Rocrail.\\
+Also a dedicated program is available to control the boards directly.\\
+The board is connected to the serial (COM) port of the computer and controls 8 leds individual.\\
+A protocol called SPL is used to control the leds, and also a special command is included to change address of this board.\\
+The board can be connected into a chain of more than 50 boards, all with individul pre programmed address.\\
+Supply of 5 V is needed, which should be adapted to total demand of power in the chain.\\
+A nice supply unit for this could be [[http://wiki.rocrail.net/doku.php?id=gca08-en|GCA08-1]] or [[http://wiki.rocrail.net/doku.php?id=gca08-en|GCA08-3]].\\
+===== Firmware =====
+The firmware is simple and could be dveloped in basic , using PicSimulator IDE form www.oshonsoft.com.\\
+|  {{:gca:gca_lm2_v2_firmware.zip|Basic sources and .HEX file}}  |
+===== The hardware =====
+|  {{:gca:gca_lm2_sch.pdf|The schematics}}  |
+|  {{:gca:gca_lm2_pcb.pdf|The pcboard and parts positions}}  |
+|  {{:gca:gca_lm2_parts.pdf|Partslist  }}  |
+^ N.B. Only complete ordered kits will be supported! ^
+===== Connections =====
+To give the user multiple choices of how to connect the board, there are several options.\\
+Explanation and drawing are pending.......
+=====The final result =====
+A nice pc-board is available, in the same quality you are used to from GCA.\\
+|  {{:gca:gca_lm2_pict01.jpeg?0x300}}  |  {{:gca:gca_lm2_pict03.jpeg?0x300}}  |
+|  The white connector can be used to connect to  \\  GCA Interfaces like  \\  GCA76, GCA77 , GCA107 etc.  |  GCA_LM2 ready for direct connection with leds  \\  no resistors for leds needed.  |
+\\
+===== Setup & Control =====
+  * __**[[:elektor-spl-en|Serial Programmable LEDs (SPL)]]**__
+\\
+===== Connecting Leds  (how to) =====
+  * __**[[https://wiki.rocrail.net/doku.php?id=mgv-overview-en#direct_connection_of_led_s|led connection examples]]**__
+\\
+===== Stand alone controller =====
+A standalone control program is available from www.modeldigitaal.nl\\
+===== Connection LM 2 to PC. =====
+One of the LM2 boards should be connected to PC as follows:
+^  Connector J1 or J2  \\  GCA_LM2  ^  Sub-D9  \\  ComPort PC  ^  Function  ^
+|  - (min)  |  5  |  Ground  |
+|  S  |  3  |  Send, Tx  |
+===== Connection between  GCA-LM2 boards =====
+Boards could be connected from one to another by using either J1/J2 or with the use of flatcable and J5.\\
+In case J1/J2 just use 3 wires: \\
++  to +\\
+s to s\\
+- to -\\