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--- cubloc:rs232c_howto:index [2021/04/28 09:48]
COMFILE Technology
+++ cubloc:rs232c_howto:index [2023/09/11 13:43]
COMFILE Technology
@@ Line 1: / Line 1: @@
+====== RS-232C HOWTO ======
+A PC's RS-232 interface typically use +/-12V signals, while the CUBLOC's RS-
+interface uses 5V signals. To avoid the need to make a separate circuit
+to convert the +/-12V signals from the PC to the 5V signals of the CUBLOC,
+and vise-versa, the CUBLOC was built with both a +/-12V RS-232 interface
+(channel 0 – the download port) and a 5V RS-232 interface (channel 1).
+The +/-12V RS-232 interface (channel 0) is provided on pins 1 and 2. For
+the CB220/320 a 5V RS-232 interface id provided on pins 10 and 11.
+{{ :cubloc:rs232c_howto:cb220rs232_1.png?nolink |}}
+For the CB280/380, RS-232 channel 1 can make use of either 5V or +/-12V
+signals, but the pins are different. For a 5V interface, use pins 49 and 50.
+For a +/12V interface use pins 33 and 34.
+{{ :cubloc:rs232c_howto:cb280rs232c.png?nolink |}}
+Downloading programs to the CUBLOC is very easy, since the PC's RS-232
+interface can connect directly to pins 1 and 2 of the CUBLOC. For RS-422
+and RS-485, 5V signals are provided on RS-232 channel 1.
+For the CB280, a +/-12V RS-232 interface is provided in addition to the 5V
+interface, but only one can be used at a time.
+The following shows a simple circuit diagram to convert a 12V RS-232
+interface to a 5V RS-232 interface using a MAX232 chip.
+{{ :cubloc:rs232c_howto:rs232circuit.png?nolink |}}
+For the CB400, CB405, and CB405RT, see [[cubloc:using_rs-232_on_the_cb400_405_405rt|Using RS-232 on the CB400/405/405RT]]
+NOTE: For capacitor values, please prefer those recommended in your MAX232 IC's datasheet.
+The MAX232 is a very useful chip for converting between 5V and +/-12V
+RS-232 signals.
+{{ :cubloc:rs232c_howto:max232.png?nolink |}}
+[[cubloc:index|CUBLOC - Embedded Controller]]

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