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howto:serial_connector 2006/12/06 00:33 howto:serial_connector 2017/09/06 17:34 current
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**WARNING attaching a serial port will certainly void your warranty and could destroy your unit.** **WARNING attaching a serial port will certainly void your warranty and could destroy your unit.**
-The following information applies to version B1, there is a version B2 which may or may not be the same.  J3 is the serial console connection, some units have a connector installed some do not, mine did not.+The following information applies to version B1, there is a version B2 which may or may not be the same.  J3 is the serial console connection, some units have a Jameco catalog #420355 connector installed some do not, mine did not. The Jameco catalog number for the plug end is #420267. They are .49" headers.
-The serial console at J3 is a logic level signal, not RS232 used by serial ports such as those on PCs. Two approaches have been used to solve this problem.  One is to use a USB serial port chip leaveing out it's RS232 converters.+The serial console at J3 is a logic level signal, not RS232 used by serial ports such as those on PCs. Two approaches have been used to solve this problem.  One is to use a USB serial port chip leaveing out it's RS232 converters.
-The other which is described here is to connect up a 3.3v-to-RS232 converter such as the [[http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1780|MAX3232]].  COMPSys sells an adapter with that I.C. and supporting components on a circuit board with a DB9 connector preassembled, the [[http://www.compsys1.com/workbench/On_top_of_the_Bench/Max233_Adapter/max233_adapter.html|A232DBH3v (scroll down)]] which was used in this example.+The other is to connect up a 3.3v-to-RS232 converter such as the [[http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1780|MAX3232]].  COMPSys sells an adapter with that I.C. and supporting components on a circuit board with a DB9 connector preassembled, the [[http://www.compsys1.com/workbench/On_top_of_the_Bench/Max233_Adapter/max233_adapter.html|A232DBH3v (scroll down)]] which was used in this example. 
 + 
 +=====Using A232DBHv3 adapter=====
J3 provides 3.3v (pin 1), Transmit Data (pin 2), Receive Data (pin 3) and GND (pin 4), **I found that my 25W Weller Soldering Iron would not melt the solder in the GND through-hole so I used a different point for GND**.  J3 provides 3.3v (pin 1), Transmit Data (pin 2), Receive Data (pin 3) and GND (pin 4), **I found that my 25W Weller Soldering Iron would not melt the solder in the GND through-hole so I used a different point for GND**. 
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-===== Links =====+=====Using MAX3232 or generic chip=====
-  * [[http://forum.dsmg600.info/t67-Serial-interface.html|Forum thread]]+If you want to build your own serial converter, you will need the following parts: 
 +  * (5) 0.1 uF resin dipped capacitors (Monroes), 16V 
 +  * (1) MAX3232 IC (Maxim or generic), 3V type, 16 pin DIL 
 +  * (1) Right angled RS232 male socket 
 +  * (1) 10 element stripboard 
 +  * (1) 16 pin chip mount 
 +  * (1) Wire 
 + 
 +{{:howto:shifter-dsmg600.jpg?w=120&h=86}} 
 + 
 +^ J3 Pin          ^ Signal ^  
 +^ 1    | Power (+3.3v)                | 
 +^ 2    | Transmit Data (TX)          | 
 +^ 3    | Receive Data (RX)            | 
 +^ 4    | Ground (GND)                | 
 + 
 +=====Serial Port Settings===== 
 +^ Data  ^ Settings ^ 
 +^ Baudrate |9600  | 
 +^ Data bits |8    | 
 +^ Stop bits |1    | 
 +^ Parity |None  | 
 +^ Flow Control |None  | 
 + 
 +===== Links ===== 
 +  * [[:talk:howto:serial_connector|Talk page with user experiences]] 
 +  * [[http://dns323.kood.org/forum/t67-Serial-interface.html|Forum thread]] 
 +  *  [[http://linkstationwiki.net/index.php?title=Add_a_Serial_port_to_the_PowerPC_Linkstation|linkstationwiki.net/index.php?title=Add_a_Serial_port_to_the_PowerPC_Linkstation]] 
 +  * [[http://www.kurobox.com/mwiki/index.php/Add_Serial_Port|kurobox.com/mwiki/index.php/Add_Serial_Port]]
  * [[http://forum.openwrt.org/viewtopic.php?id=4275|Discussion about serial port at openwrt.org forum]]   * [[http://forum.openwrt.org/viewtopic.php?id=4275|Discussion about serial port at openwrt.org forum]]

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