You could try « RC 1 » blind. That will reset the EEPROM values to factory settings. However I do not see any settings for serial rates, so it may not help. >From your oscilloscope, it should be possible to determine stop/start and baud >rate and decode the binary data. I have done this in the distant past. There are web resources. Check out <http://electronics.stackexchange.com/questions/17562/how-to-read-serial-data-from-oscilloscope> for example.
Mike > Le 4 mars 2016 à 09:36, Philip Zahariev via time-nuts <[email protected]> a > écrit : > > Hi Jarl, > > As I already write PRS10 is configured as serial communication. With > oscilloscope I can see serial signals, but when enter this signal in computer > with TTL level USB2serial converter all information is repeatable character > unknown for me and not as described in manual. For test i change baud rate, > number of stop bits, number of bits without success. Also trace signal to > U302 MC68HC11 pin 20 and 21 and both TX and RX are the same as on J100 > (external connector) - time/period and amplitude has TTL levels. For me looks > like internal ROM has incorrect bits or processor is not in normal state and > response from serial port coming from different subroutine. > I expect hints how to check processor state. Or how to push processor in > state where will have normal serial communication. > > Best regards > Philip > >> On 4.03.2016 г., at 9:35, Jarl Risum <[email protected]> wrote: >> >> OK, Philip >> >> If you have confirmed with a Oscilloscope that no RS-232 communication is >> present on the TXD output pin, I sugggest you check the status of R247/R248 >> and R353/R354 - see the manuals chapter on "PRS 10 Applications" (page 20), >> description of pin 4 and pin 7. >> >> Good luck >> >> Jarl >> >> 2016-03-03 20:08 GMT+01:00 Philip Zahariev <[email protected]>: >>> Hi Jarl, >>> >>> >>> >>> Of course I use TTL level USB serial converter. Unfortunately, as I write >>> no communication, or at least not what I expect. >>> >>> >>> >>> Best regards >>> >>> Philip >>> >>> >>> >>> From: Jarl Risum [mailto:[email protected]] >>> Sent: Wednesday, March 2, 2016 11:49 PM >>> To: [email protected]; [email protected] >>> Subject: PRS 10 and serial port communication >>> >>> >>> >>> Philip, >>> >>> The outgoing RS-232 port from PRS 10 is a TTL inverter with an approx. 1 >>> kohm series resistor. >>> >>> See diagram of the microcontroller board, upper right corner. >>> >>> For this reason you may have problems reading the outgoing RS-232 messages >>> with a standard RS-232 PC input. But you may see the transmission taking >>> place with a oscilloscope. >>> >>> I have had the same problem with my PRS 10 and solved it with a simple 2 >>> transistor non-inverting amplifier fed from a +12V source. >>> >>> If interested, I can send you the diagram. >>> >>> Cheers from >>> >>> OZ9MO / Jarl >>> >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. "The main function of a modern police force is filling in forms." _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
