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+====== GCA174 Decoder for GCA145 to simulate Märklin / Fleischmann / Lenz standard turnout decoders.======
+[[:english|{{  rocrail-logo-35.png}}]]
+[[:english|Content]] -> [[:hardware-en|Hardware]] -> [[:hardware-en#interfaces|GCA]]
+  *  [[:mgv-overview-en|The GCA modules]]
+ \\
+^^^^By Marc Roede and Peter Giling ^^^^
+===== Description =====
+Many software control programs do not have the ability to use the 7 control bits as a Byte.\\
+They use the standard method for controlling Turnouts.\\
+This board is only attachable to J5 of GCA145/MGV145, and simulates either Märklin, Fleischmann or Lenz turnout controllers, depending on the programmed firmware\\
+For each brand name, there is special firmware available, see below,  under 'The board design'.\\
+It receives the standard codes and converts that to the 7 outputs, needed to select position 1..48 on GC145/MGV145.\\
+Also an isolated feed-back is provided.\\
+Feed-back is free to be used with systems like S88.\\
+The on-board opto-couplers isolate the didital rail signals and feed-back from the board.\\
+Feed-back is very nice inside Rocrail environment, because it can signal Rocrail to start a train AFTER the selected postion has been reached.\\
+===== The board design =====
+{{  :gca:gca174mr_pict01.jpg?300}}
+|  {{:gca:gca174MR_sch.pdf|The schematics}}  |
+|  {{:gca:gca174MR_pcb.pdf|The pc-Board and parts positions}}  |
+|  {{:gca:gca174MR_parts.pdf|The bill of materials}}  |
+|  {{:gca:manual_gca174mr_en.pdf|manual English}}  |
+|  {{:gca:all_hex_files_gca174mr.zip|All hex files for GCA174MR}}  |
+\\
+\\
+===== Address selection =====
+The adresses are identical to the Märklin / Fleischmann / Lenz standard, depending on the programmed firmware.\\
+**N.B. Besides the short manual, as presented here, it is also adviseable to consult the original manual for your turntable dekoder.**\\
+\\
+===== Feed-back =====
+GCA174MR has a feed-back signal, to inform Rocrail that turntable is ready to move trains on/off.\\
+This feed-back signal is electrical (galvanic)isolated from the GCA174MR.\\
+By connecting J2 pt 3(+) and 4(-) to any device like S88 units or derivates,\\
+Settings in Rocrail , see Position sensor\\
+This {{:gca:gca174_connections.pdf|drawing }} shows how to connect GCA147MR.\\
+\\
+===== Led signals =====
+GCA174MR is priovided with 8 leds for indication of decoded turntable position.\\
+The led with indicatio 'wr1' shows the write signal ( in Rocrail, look for 'new Position Flag' ), to inform GCA145 to start responding on the given position.\\
+The led with indication 'rdy1'indicates that GCA145 has returned the 'turnrtable ready' signal.\\
+\\
+===== Extra modification on blue coloured GCA145(MGV145) boards =====
+{{  :mgv:hardware:extra-diode_on_gca145.jpg?300}}
+GCA174 needs 5 Volt which is by default not available from J5 on older version boards GCA145.\\
+Therefore, a diode 1N4003 (or equivalent) should be mounted under J5 as this picture shows.\\
+**NOTE:** The latest green GCA145 pcb has this diode(D10) on board, so no further attention needed.\\
+\\