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+====== GCA500 LNet 16 bits I/O interface with SUBD-9 and RJ12 sockets ======
+[[english|{{  rocrail-logo-35.png}}]]
+[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#locoio|GCA]]
+  *  [[mgv-overview-en|The GCA Modules]]
+    * [[:lnsv-en|Setup dialog]] | [[:loconet:lio-sw:lio-sw|Setup protocol]]
+{{  :gca:gca500_pict01.png?230}}{{  :gca:gca500_pict02.png?250}}
+ \\
+^^^^By Peter Giling ^^^^
+===== Unit is made on the same basics as GCA50 =====
+GCA50 was originally made for Modelspoor Groep Venlo (MGV) to be used for the modules of the large layout with K-rails from Märklin.\\
+Because these modules were frequently be separated, transported and joined together on various shows, the choice was made to use\\
+Sub-dconnectors instead of the mechanical rather weak RJ12 connectors.\\
+Also because of the large amount of GCA50 units ( up to 90 !) the current in a RJ12 connector and cable was rather limited.\\
+But more and more people prefer the use of RJ12 cable, so together with the creation of GCA51 for RFID, the GCA50 was created with RJ12 connectors, and called GCA500.\\
+The pictures on top show the two options:
+  *  only two RJ12 connectors.
+  *  SUB-d male and female and one RJ12,
+\\
+===== Hardware =====
+|  {{:gca500_sch.pdf|The schematic design}}  |
+|  {{:gca500_pcb.pdf|The printed circuit board with part positions}}  |
+|  {{:gca500_parts.pdf|The bill of materials}}  |
+\\
+===== Connections and port information =====
+Please refer to GCA50.
+\\
+===== Jumper setting =====
+JP1 is used for reporting startup situation.\\
+When GCA500 is powered up, it will report the logical situation of all ports which are configured as input.\\
+When JP1 is set, this report will be aborted, which can be useful for some slow starting systems.\\
+GCA85 or GCA101, together with Rocrail, will not have that restriction, so you can leave the jumper off.\\
+\\
+===== Other differences between GCA50 and GCA500 =====
+ON GCA500 a serial resistor R14 in the lococNet communication line is added, to avoid damage in T1 , when wrong connections are made (cable faults).\\
+R14 lowers the total current through T1 in order to keep it in good health.\\
+The power regulator VR2(7805 TO-220) can also be replaced by VR1 (= R-78E5).\\
+This switching regulator can handle up to 1 Amp constant current, with very low loss of energy in heating.\\
+For larger setups with many units, this is preferable because it takes about 60% less load from the 12 Volt power supply.\\
+Also, when one or two GCA107 boards are connected, and many relays continiously activated, the VR1 is needed.\\
+\\
+===== Fits in Littfinsky LDT-1 box =====
+Same as GCA51, the GCA500 is also useable to be fixed in a Littfinsky LDT-1 box.\\
+These boxes are available from
+  *  Littfinsky http://www.modellbahndiskont.at/AUSLAUFMODELLE/Digital/Littfinski-000104-Gehaeuse-LDT-01.htm?shop=modellbahn&SessionId=&a=article&ProdNr=LDT000104&t=4718&c=9027&p=9027