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gca174mr-en [2018/11/12 08:56] (current)
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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.\\
 +\\
gca174mr-en.txt · Last modified: 2018/11/12 08:56 (external edit)