Sign in

username:

password:



Not a member?

Search piclist



Search tips

Subscribe to piclist



piclist by Keywords

12F675 | 16F628 | 16F84 | 16f877 | 16F877A | 16F88 | 18F458 | ADC | AVR | Bootloader | CAN | CCS | CRC | EAGLE | EEPROM | ICD | ICSP | IDE | JDM | LED | Macros | Microchip | MPLAB | PCB-CAD | PIC10F | Pic12f675 | PIC16F84 | PIC16F84A | PIC16F877 | PIC18 | PIC18F452 | PicBasic | PICC | PICSTART | PWM | RS-485 | RS232 | SMT | SPI | UART | USART | USB | Wireless | Wisp628 | Xilinx

Ads

Discussion Groups

See Also

DSPFPGAElectronics

Discussion Groups | Piclist | Serial Multiplexing

A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.

Serial Multiplexing - Author Unknown - Jul 1 10:24:00 2004

I have 2 serial ports on my 18F458, but the problem is that I need
3. Is there anyway I can multiplex 2 lines into one of the ones on
the PIC?

Thanks.





(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )


Re: Serial Multiplexing - Author Unknown - Jul 1 10:32:00 2004

In a message dated 7/1/2004 11:27:47 AM Eastern Daylight Time, h...@yahoo.com writes:


I have 2 serial ports on my 18F458, but the problem is that I need
3.  Is there anyway I can multiplex 2 lines into one of the ones on
the PIC?


Why do you need three?  Are you sending data to 3 different places?  If so, you can  use an "address" with one of  your two lines so it will be received by a specific receiver.  For instance:

serout pin, baud, ["A", data]

then serin pin, baud, [wait("A"), data]

Sid




(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: Serial Multiplexing - Author Unknown - Jul 1 11:02:00 2004

I am sending/receiving data to 3 different places. How can I use
the address feature with CCS C Compiler? --- In , Newzed@a... wrote:
> In a message dated 7/1/2004 11:27:47 AM Eastern Daylight Time,
> honamos@y... writes: > > I have 2 serial ports on my 18F458, but the problem is that I
need
> > 3. Is there anyway I can multiplex 2 lines into one of the ones
on
> > the PIC?
> >
>
> Why do you need three? Are you sending data to 3 different
places? If so,
> you can use an "address" with one of your two lines so it will
be received by
> a specific receiver. For instance:
>
> serout pin, baud, ["A", data]
>
> then serin pin, baud, [wait("A"), data]
>
> Sid

______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: Re: Serial Multiplexing - Author Unknown - Jul 1 11:14:00 2004

In a message dated 7/1/2004 12:03:53 PM Eastern Daylight Time, h...@yahoo.com writes:


I am sending/receiving data to 3 different places.  How can I use
the address feature with CCS C Compiler?


I don't know anything about C compilers, but I use this system to send data to 12 different places using a single serout line.  Look at the "Wait" command - that's the one that will let you "address"  a specific destination.

Sid




(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: Serial Multiplexing - Joe Jansen - Jul 1 11:17:00 2004

I did this with an 18F242, 1 UART and 2 destinations. I used MAX323
switches to switch between the 2 targets. Each target port had a '323
on it to turn it on or off. The PIC made sure only one was selected
at a time. A custom handshaking scheme was required, but otherwise it
worked.

--Joe Jansen

On Thu, 01 Jul 2004 15:24:33 -0000, <> wrote:
>
> I have 2 serial ports on my 18F458, but the problem is that I need
> 3. Is there anyway I can multiplex 2 lines into one of the ones on
> the PIC?
>
> Thanks. > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
> Yahoo! Groups Links


______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: Re: Serial Multiplexing - Joe Jansen - Jul 1 11:22:00 2004

How did you wire it? The OP did not specify whether he was using
RS-232, RS-485, or what. I assume that you had 485/422, since RS-232
is a point to point protocol. Yes, I realize that there are hacks out
there that have been used, but it becomes incumbent on each of the
'client' devices to implement the addressing scheme.

--Joe Jansen
----- Original Message -----
From: <>
Date: Thu, 1 Jul 2004 12:14:36 EDT
Subject: Re: [piclist] Re: Serial Multiplexing
To:

In a message dated 7/1/2004 12:03:53 PM Eastern Daylight Time,
writes:
I am sending/receiving data to 3 different places. How can I use

the address feature with CCS C Compiler? I don't know anything about C compilers, but I use this system to send
data to 12 different places using a single serout line. Look at the
"Wait" command - that's the one that will let you "address" a
specific destination.
Sid

to unsubscribe, go to http://www.yahoogroups.com and follow the instructions

Yahoo! Groups Sponsor ADVERTISEMENT ________________________________

Yahoo! Groups Links
To





(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: Re: Serial Multiplexing - Author Unknown - Jul 1 11:43:00 2004

In a message dated 7/1/2004 12:23:41 PM Eastern Daylight Time, j...@gmail.com writes:


How did you wire it?  The OP did not specify whether he was using
RS-232, RS-485, or what.  I assume that you had 485/422, since RS-232
is a point to point protocol.  Yes, I realize that there are hacks out
there that have been used, but it becomes incumbent on each of the
'client' devices to implement the addressing scheme.


Point to point with a 220 ohm resistor in series.

Sid



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )