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 
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>>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from it, 
>>>>>>>>>>>>> send an email to [email protected]. 
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>>>>>>>>>>>>> https://groups.google.com/d/msgid/jallib/CAM%2Bj4qtaBjojssk_HHFK1M2dhhL9CNNf3mygd1F3nH0B5bck9A%40mail.gmail.com.
>>>>>>>>>>>>>  
>>>>>>>>>>>>> 
>>>>>>>>>>>>> -- 
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>>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>>   
>>>>>>>>>>>>   
>>>>>>>>>>>>>  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. 
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>>>>>>>>>>>  
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> -- 
>>>>>>>>>>> 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.
>>>>>>>>>  
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> -- 
>>>>>>>> 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]. 
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>>>>>>>> https://groups.google.com/d/msgid/jallib/187dbbf2-8c1b-43c2-ac9b-ce320495f60fn%40googlegroups.com.
>>>>>>>>  
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> -- 
>>>>>>>> You received this message because you are subscribed to the Google 
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>>>>>>>> an email to [email protected]. 
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>>>>>>>> 
>>>>>>>> 
>>>>>>> 
>>>>> 
>>>>> 
>>>>> -- 
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>>>>>  
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>>>>> 
>>>>> . 
>>>>> 
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>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>> 
>>>> 
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