oh my god

if i change this bit , i don't have any communication between PICs.
just in this mode(Master = "const serial_sw_invert = false" and Slave 
"const serial_sw_invert = true"  , you write mistake ) 
, i can send/receive and in other modes , i can't send/receive and PICs 
stopped (because i have a led  for blanking ,in other modes led doesn't 
work)

how do i do for solve?


On Saturday, April 24, 2021 at 9:58:18 PM UTC+4:30 Kiste wrote:

> Master has
>
> "const serial_sw_invert = true"
>
> Slave has
>
> "const serial_sw_invert = false"
>
> That is what I meant by mismatched polarity
>
>
>
>
>
>
> Am Samstag, 24. April 2021, 19:19:14 MESZ hat majid ebru <
> [email protected]> Folgendes geschrieben: 
>
>
>
>
>
> Thank you
> this is minimum. 
>
> On Saturday, April 24, 2021 at 8:43:59 PM UTC+4:30 [email protected] 
> wrote:
> >  
> >  
> >  Hi Majid,
> > 
> >  
> > 
> > 
> >  Discussing this without any sample program doet not help to analyze the 
> problem.
> > 
> >  
> > 
> > 
> >  Back to my previous question. Did you minimize the program so that you 
> are only testing the communication?
> > 
> >  
> > 
> > 
> >  Can you send a sample program and maybe also a schematic diagram of the 
> hardware you are using?
> > 
> >  
> > 
> > 
> >  Kind regards,
> > 
> >  
> > 
> > 
> >  Rob
> > 
> >  
> > 
> > 
> > 
> > ________________________________ 
> > 
> > Van: [email protected] <[email protected]> namens majid 
> ebru <[email protected]>
> > Verzonden: zaterdag 24 april 2021 17:35
> > Aan: jallib <[email protected]>Onderwerp: Re: NT: [jallib] How to 
> send & receive data over medium distance
> > Reverse polarity?! 
> > Sorry but how do I do that?!
> > 
> >  
> > On Saturday, April 24, 2021 at 7:24:34 PM UTC+4:30 Kiste wrote:
> > 
> > 
> >>  So you're sending 57 (=0b00111001 or "9") and receiving 99 
> (=0b01100011 or "c").  Could be reverse polarity. 
> >> 
> >> 
> >> 
> >> Am Samstag, 24. April 2021, 16:41:57 MESZ hat majid ebru <
> [email protected]> Folgendes geschrieben: 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> Hi 
> >> 
> >> PIc1(sender) : 
> >> forever loop 
> >>     if btn1 then block 
> >>         serial_sw_data = "9" 
> >>         delay_1ms(5) 
> >>     end if 
> >> end loop 
> >> --------------------------------------------- 
> >> 
> >> 
> >> 
> >> PIc2(receiver) : 
> >> forever loop 
> >>     if (serial_sw_read(char)) then block 
> >>          lcd_cursor_position(1,1) 
> >>          print_byte_dec(lcd, char+ "0")  -- ==> i see in LCD :  147 
> >> ---------- 
> >>          lcd_cursor_position(1,8) -- ==> i see in LCD : (  c  )  --  
> character c 
> >>          lcd = char 
> >>      end block 
> >>     end if 
> >> end loop 
> >> --------------------------------------------- 
> >> 
> >> On Saturday, April 24, 2021 at 5:56:21 PM UTC+4:30 majid ebru wrote: 
> >>> 
> >>> Hi again 
> >>> 
> >>> I'm very confused. 
> >>> 
> >>> Why can't I send and receive?!?😫😫😫😫 
> >>> 
> >>> I tested both codes,integer and ASCII code , but I read incorrect 
> data. 
> >>> 
> >>> What is your suggestions ?! 
> >>> On Saturday, April 24, 2021 at 2:23:56 PM UTC+4:30 Kiste wrote: 
> >>>> It is important whether you use one or the other. If the sender 
> speaks tagalog, and the receiver expects to hear mandarin, they won't be 
> able to communicate. 
> >>>> 
> >>>> Greets, 
> >>>> Kiste 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> Am Samstag, 24. April 2021, 11:49:49 MESZ hat majid ebru <
> [email protected]> Folgendes geschrieben: 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> Hi 
> >>>> 
> >>>> It isn't important that I read ASCII or .... . 
> >>>> It is important that I read true. 
> >>>> 
> >>>> Thanks , I will test and I say result. 
> >>>> 
> >>>> On Saturday, April 24, 2021 at 11:59:22 AM UTC+4:30  
> [email protected] wrote: 
> >>>>>   
> >>>>>   
> >>>>>  Hi Majid, 
> >>>>> 
> >>>>>   
> >>>>> 
> >>>>> 
> >>>>>  If you want to print it  - as ASCII -on the receiving side, change 
> >>>>> 
> >>>>>   
> >>>>> 
> >>>>> 
> >>>>>  temp[i] = char  
> >>>>> 
> >>>>>  by 
> >>>>> 
> >>>>>  temp[i] = char + "0" 
> >>>>> 
> >>>>>   
> >>>>> 
> >>>>> 
> >>>>>  Then you can print it. 
> >>>>> 
> >>>>>   
> >>>>> 
> >>>>> 
> >>>>>  Kind regards, 
> >>>>> 
> >>>>>   
> >>>>> 
> >>>>> 
> >>>>>  Rob 
> >>>>> 
> >>>>>   
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> ________________________________ 
> >>>>> Van: 'Oliver Seitz' via jallib <[email protected]>Verzonden: 
> zaterdag 24 april 2021 09:07Aan: [email protected] <
> [email protected]> 
> >>>>> Onderwerp: Re: NT: [jallib] How to send & receive data over medium 
> distance 
> >>>>> You're sending binary and trying to receive ad ASCII 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> Am Samstag, 24. April 2021, 09:00:37 MESZ hat majid ebru <
> [email protected]> Folgendes geschrieben: 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> For example,I want to send 642 .... 
> >>>>> 
> >>>>> I use this code in sender 
> >>>>> ... 
> >>>>> Serial_sw_data = 6 
> >>>>> Delay_1ms(2) 
> >>>>> Serial_sw_data = 4 
> >>>>> Delay_1ms(2) 
> >>>>> Serial_sw_data = 2 
> >>>>> Delay_1ms(2) 
> >>>>> ... 
> >>>>> 
> >>>>> But in receiver , I can't read correctly. 
> >>>>> 
> >>>>> Var byte Temp[3] 
> >>>>> Var byte i = 0 
> >>>>> For loop 
> >>>>>   If serial_sw_read(char) then 
> >>>>>     Temp[i] = char 
> >>>>>      Print_string(lcd,Temp[i]) 
> >>>>>      i = i + 1 
> >>>>>      If 2 < i then i = 0 end if 
> >>>>> End loop 
> >>>>> On Saturday, April 24, 2021 at 11:19:31 AM UTC+4:30 majid ebru 
> wrote: 
> >>>>>> Thank all 
> >>>>>> 
> >>>>>> But I need sample code for read. 
> >>>>>> 
> >>>>>> Almost ,all documents use write code and I didn't saw read code. 
> >>>>>> 
> >>>>>> 
> >>>>>> On Saturday, April 24, 2021 at 10:58:36 AM UTC+4:30 vasile wrote: 
> >>>>>>> Majid, one good practice when you're testing communication between 
> two embedded systems (A and B) is to check each one with a terminal first. 
> >>>>>>> 
> >>>>>>> Assuming A is sending to B and B receives and does something on IO 
> port, test first the TX of A to the computer terminal, then RX of B from 
> the computer terminal. After that, only if each one works ok, connect TX/RX 
> of A with B.  Some good free terminals for this job (search for:) Realterm, 
> Teraterm, Termite. You may also need a hardware converter which depends on 
> your computer (if you have a real COM port with RS232 levels or just an 
> USB/RS232 with 3.3V or 5V levels). 
> >>>>>>>                              
> >>>>>>> This approach will protect you from a lot of trouble and make you 
> understand if a byte, a word, an ASCII or something else is truly 
> sent/received and was sent/received in the right order. 
> >>>>>>> 
> >>>>>>> Simplify your work by sending and receiving ASCII symbols first 
> and then understand all the used procedures from the libraries (this is 
> mandatory to understand which is your fault/misunderstanding or which is 
> the software bug... there are bugs in any software...:) ). 
> >>>>>>> 
> >>>>>>> 
> >>>>>>> 
> >>>>>>> On Sat, Apr 24, 2021 at 8:36 AM Rob CJ <[email protected]> 
> wrote: 
> >>>>>>>>   
> >>>>>>>>   
> >>>>>>>>  Hi Majid, 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>  If you want to send an integer value you indeed have to send it 
> in bytes. But that thouls be faily easy with JAL. 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>  If have for example a variable of type word you can do the 
> following 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>  var word my_word_variable 
> >>>>>>>> 
> >>>>>>>>  var byte  my_byte_variable_low at my_word_variable 
> >>>>>>>> 
> >>>>>>>>  var byte my_byte_high at my_word_variable + 1 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>>  You can then send both 'my_byte' variables separately and in the 
> other PIC you do the same, read the two bytes which are mapped to a word. 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>  Als see the documentation of the JAL compiler. 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>  Kind regards, 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>  Rob 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> ________________________________ 
> >>>>>>>> Van: [email protected] <[email protected]> namens 
> majid ebru <[email protected]> 
> >>>>>>>> Verzonden: vrijdag 23 april 2021 19:47 
> >>>>>>>> Aan: jallib <[email protected]> 
> >>>>>>>> Onderwerp: Re: NT: [jallib] How to send & receive data over 
> medium distance 
> >>>>>>>>   
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> Please help me 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> I almost work with micro ,12 years ago . 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> Now I can't send / receive data?! 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> I should send and receive an integer(like adv value and ....) , 
> but in serial_sw_data I just can send a byte ?!?!!! 
> >>>>>>>> 
> >>>>>>>> And just read a byte with serial_sw_read(char)?! 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> I know that my kowlage about electronic is wake , but now I 
> should do read&write data?! 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> Please guide me,🙏🙏🙏🙏🙏🙏🙏🙏 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>   
> >>>>>>>> On Thursday, April 22, 2021 at 11:23:23 PM UTC+4:30  
> [email protected] wrote: 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>>   
> >>>>>>>>>  Hi Majid, 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>  You have to provide more information. How do you know that they 
> stopped? Did you narrow down the code down to the minimal size to show that 
> it fails? If so you can share that code. 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>  And to answer your other - not posted - comment. Due to the 
> fact that you use this group to answer trivial questions that you can find 
> on the Internet (which you should not do) and which are specific JAL or PIC 
> related, your posts are now moderated. Only posts which are relevant to 
> this group are passed on to the other group members. 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>  Kind regards, 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> Rob 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> ________________________________ 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> Van: [email protected] <[email protected]> namens 
> majid ebru <[email protected]> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> Verzonden: donderdag 22 april 2021 20:19 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> Aan: jallib <[email protected]>Onderwerp: Re: NT: 
> [jallib] How to send & receive data over medium distance 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> Hi  
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> Please help me again😢😢😫😫🥺🥺🤔🤔 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> When I connected two PICs together , everything is ok. 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> But when disconnect port serial , both PICs hanged ?!?! 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> Both micro stoped , and when connected again ,both micro work 
> correctly?! 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> In fact both micro stopped in line : if  serial_sw_read(char)) 
> then block .... 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> And doesn't run other codes🤔🥺😫😢 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> Why?! 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> How should I do ?! 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> On Wednesday, April 21, 2021 at 10:12:03 PM UTC+4:30 
> funlw65(Vasi) wrote: 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>>   
> >>>>>>>>>> The microcontroller boards that are used in Polish Universities 
> are all equipped with (external - note for Majid) RS485 chips.  
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>>   
> >>>>>>>>>> On Wed, Apr 21, 2021 at 4:54 PM Rob CJ <[email protected]> 
> wrote: 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>>   
> >>>>>>>>>>>   
> >>>>>>>>>>>   
> >>>>>>>>>>>  Hi Majid, 
> >>>>>>>>>>> 
> >>>>>>>>>>>   
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>>  Please use Google to find out what RS485 and IIC is. Use the 
> Jallib group for issues with libraries and the compiler not for general 
> questions that you can easily find on the internet. 
> >>>>>>>>>>> 
> >>>>>>>>>>>   
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>>  Thanks. 
> >>>>>>>>>>> 
> >>>>>>>>>>>   
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>>  Kind regards, 
> >>>>>>>>>>> 
> >>>>>>>>>>>   
> >>>>>>>>>>> Rob 
> >>>>>>>>>>> 
> >>>>>>>>>>>   
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> ________________________________ 
> >>>>>>>>>>> Van: [email protected] <[email protected]> namens 
> majid ebru <[email protected]> 
> >>>>>>>>>>> Verzonden: woensdag 21 april 2021 15:47 
> >>>>>>>>>>> Aan: jallib <[email protected]> 
> >>>>>>>>>>> Onderwerp: Re: NT: [jallib] How to send & receive data over 
> medium distance 
> >>>>>>>>>>>   
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> RS485 is very powerful. 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> But I don't how to implement in PIC?!? 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> Is i2c the same rs485?! 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>>   
> >>>>>>>>>>> On Wednesday, April 21, 2021 at 4:41:19 PM UTC+4:30 vasile 
> wrote: 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>>>   
> >>>>>>>>>>>>   
> >>>>>>>>>>>>   
> >>>>>>>>>>>> At 15m and 5V there is no problem with data sent in current. 
> Using twisted wire cable is a good habit. 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> From the EMI perspective twisted cable it is about half as 
> good as a shielded cable and has the parasitic capacity quite low compared 
> with the shielded cable. 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> RS485 (standard 32 loads) is feasible at 1Km and quite high 
> speed. Still there is an issue with the ground line and requires good 
> terminators. 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> Data goes either on A&B plus ground cable (three wires 
> between Tx and RX) or just A&B (two wire cable) and ground connected to 
> earth on the transmitter and receiver end. 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> In the last configuration an issue is quite frequent caused 
> by an offset (variable ground potential between TX and RX). 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> Also lightning is a problem for outdoor cables...and nothing 
> help... :)... no matter how others will convince you to put three tranzorbs 
> on each TX and RX  end. 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> happy communications! 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>>   
> >>>>>>>>>>>>   
> >>>>>>>>>>>> On Wed, Apr 21, 2021 at 8:32 AM 'Oliver Seitz' via jallib <
> [email protected]> wrote: 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>>   
> >>>>>>>>>>>>   
> >>>>>>>>>>>>>  Thanks for the additional information, 800m is something 
> very different from 20m ;-) 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> I can imagine that 20m at 5V ground-referenced is doable, 
> but when you're starting, better stick to the specifications and try your 
> luck when you have a bit of experience. 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> I myself am at a similar project, like 15 meter, and I want 
> to use as little standby current as possible, and no twisted pairs. It's 
> uni-directional, with constant-current pullup at the receiver and optically 
> isolated pulldown at the sender with 1200 baud... First test of the concept 
> in a few days ;-) 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> If standby current was of no concern, I'd use RS422 or RS485 
> drivers/receivers, true RS232 is old-fashioned and needs to many 
> components. 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> Greets, 
> >>>>>>>>>>>>> Kiste 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> Am Mittwoch, 21. April 2021, 07:02:46 MESZ hat vsurducan <
> [email protected]> Folgendes geschrieben: 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> Oliver, I remember the problems I had with an EIA232 with 
> +/-8V output running at 800m at 9600bps. Everything works until due the 
> transceiver heating the voltage dropped at +/-7.6V...:) 
> >>>>>>>>>>>>> The length is given by the voltage at the level converter of 
> the transmitter output. All level converters with charge pumps are not able 
> to give more than +/-8V...+/-10V in the happiest circumstances. 
> >>>>>>>>>>>>> Oldest/goldest EIA232 worked at +/-25V up to 2km. 
> >>>>>>>>>>>>> For 20m you do noy need any level converter at the output of 
> your PIC, just a twisted pair RX-GND TX-GND (CAT5 ethernet cable is 
> perfect) and an open collector transmitter ( a gate) with pull-up resistor 
> in the receiver end (at 20m distance from the transmitter). 
> >>>>>>>>>>>>> However Majid,  I think you need first to learn jal and for 
> that there is a learning curve which has to be passed.... 
> >>>>>>>>>>>>> Please start with the examples, compile them, make them run, 
> modify them as you wish and post only when nothing works for you after 
> three days of trying...this will help you more than you may believe right 
> now... 
> >>>>>>>>>>>>> best wishes 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> On Wed, Apr 21, 2021 at 7:28 AM 'Oliver Seitz' via jallib <
> [email protected]> wrote: 
> >>>>>>>>>>>>>> Hi Majid, 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> SPI is designed for centimeters, I don't think it can work 
> reliably over 20 meters. 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> RS232 at 9600 baud is ok for 150 meters, if you're using 
> real RS232 drivers and receivers like from the MAX232 series. The PIC 
> controller does not have RS232, it has a usart which handles the NRZ 
> protocol. This protocol is best known as being used by the RS232 interface. 
> Therefore the protocol itself is commonly (but wrongly) referred to as 
> "RS232" 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> RS232 uses negative voltages as a symbolic "1" and positive 
> voltages for "0". At the receiving side, the voltage must at least go 
> higher than +3V for "0" and lower than -3V for "1". At the sending side, 
> voltages from up to +15V and down to -15V are used. 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> So, to answer your question in two simple sentences: RS232 
> is ok for the job. But RS232 is not what comes out of the controller. 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> Greets, 
> >>>>>>>>>>>>>> Kiste 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> Am Dienstag, 20. April 2021, 21:56:34 MESZ hat majid ebru <
> [email protected]> Folgendes geschrieben: 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> can i ask another  question?? 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> if it is 20 meter distance between PICs , i should use 
> RS232 or SPI? 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> so sorry and thanks a lot 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> ‪majid ebru‬‏ در تاریخ سه‌شنبه ۲۰ آوریل ۲۰۲۱ ساعت 
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>>> -- 
> >>>>>>>>>>>>>> You received this message because you are subscribed to the 
> Google Groups "jallib" group. 
> >>>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails 
> from it, send an email to [email protected]. 
> >>>>>>>>>>>>>> To view this discussion on the web visit  
> https://groups.google.com/d/msgid/jallib/1697687282.4677348.1618979276333%40mail.yahoo.com.
>  
>
> >>>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> -- 
> >>>>>>>>>>>>> You received this message because you are subscribed to the 
> Google Groups "jallib" group. 
> >>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails 
> from it, send an email to [email protected]. 
> >>>>>>>>>>>>> To view this discussion on the web visit  
> https://groups.google.com/d/msgid/jallib/CAM%2Bj4qtaBjojssk_HHFK1M2dhhL9CNNf3mygd1F3nH0B5bck9A%40mail.gmail.com.
>  
>
> >>>>>>>>>>>>> 
> >>>>>>>>>>>>> -- 
> >>>>>>>>>>>>> You received this message because you are subscribed to the 
> Google Groups "jallib" group. 
> >>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails 
> from it, send an email to [email protected]. 
> >>>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>>   
> >>>>>>>>>>>>   
> >>>>>>>>>>>>>  To view this discussion on the web visit  
> https://groups.google.com/d/msgid/jallib/1020737915.4719521.1618983169979%40mail.yahoo.com.
>  
>
> >>>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> -- 
> >>>>>>>>>>> You received this message because you are subscribed to the 
> Google Groups "jallib" group. 
> >>>>>>>>>>> To unsubscribe from this group and stop receiving emails from 
> it, send an email to [email protected]. 
> >>>>>>>>>>> To view this discussion on the web visit  
> https://groups.google.com/d/msgid/jallib/22c899b2-b475-404d-9982-fb4e9ffe3169n%40googlegroups.com.
>  
>
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> 
> >>>>>>>>>>> -- 
> >>>>>>>>>>> You received this message because you are subscribed to the 
> Google Groups "jallib" group. 
> >>>>>>>>>>> To unsubscribe from this group and stop receiving emails from 
> it, send an email to [email protected]. 
> >>>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>>   
> >>>>>>>>>>>  To view this discussion on the web visit  
> https://groups.google.com/d/msgid/jallib/AM0PR07MB624188EEE1255C4E45C31F80E6479%40AM0PR07MB6241.eurprd07.prod.outlook.com.
>  
>
> >>>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> -- 
> >>>>>>>>>> 
> >>>>>>>>>> Vasi 
> >>>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> -- 
> >>>>>>>>> You received this message because you are subscribed to the 
> Google Groups "jallib" group. 
> >>>>>>>>> To unsubscribe from this group and stop receiving emails from 
> it, send an email to [email protected]. 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>>   
> >>>>>>>>> To view this discussion on the web visit  
> https://groups.google.com/d/msgid/jallib/ad446bf9-5eab-4168-8326-b33f2a02c0f5n%40googlegroups.com.
>  
>
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> -- 
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>  
>
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>> 
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>  
>
> >>>>>>>> 
> >>>>>>> 
> >>>>> 
> >>>>> 
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>  
> >>>>> . 
> >>>>> 
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>  
>
> >>>>> 
> >>>>> 
> >>>>> 
> >>>>> 
> >>>> 
> >>>> 
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>
> >>>> 
> >> 
> >> 
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>
> >> 
> >> 
> > 
> > 
> > 
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> > 
> > 
> > 
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