Rs 485 framing error

rs 485 framing error

Framing errors are normally the result of a wrong frame length. UART's give a framing error when the IC does not see a stopbit at the moment the IC is expecting. Only comms interface to the host is via the two RS-485 ports, which I Dec 2 05:12:42 raspi-br-01 wpantund[1354]: NCP => Framing error 6. The problem my code has with discarding the framing errors is that, in some cases, they occur right before the AVR is expected to receive input.

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Framing error on Rx line in rs485 to ethernet converter (2 Solutions!!)
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jamesjl



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Framing and Overrun Errors on RS485 bus
PostPosted: Wed Apr 06, 2005 12:55 am    Reply with quote

Hi all, rs 485 framing error,

PIC: 18F6220 and 16F874A
PCWH 3.218

I am having some problems with a multi PIC RS485 bus and the collision of the packets that I am sending. I have CRC error checking, re-tries for collisions and bus busy detection code written. However, occasionally the bus fails and I need to reset the PICs to get them to communicate again. I have biased the RS485 bus to ensure 200mV between the two wires of the transmission line.

I have been reading the news groups about framing errors and over-run errors and have put together what I believe to be the correct code to handle over-run and framing errors for the second hardware UART on my PIC18F6620. However, I have a couple of questions.

Where should I place this code?
Should it be outside of my ISR for my UART recieve?
Should I disable the interrupt before running this code?
Will this code handle both framing and rs 485 framing error errors?

Code:
#byte RCSTA2 = 0xF6B
#byte RCREG2 = 0xF6E
#bit OERR=RCSTA2.1
#bit FERR=RCSTA2.2
#bit CREN=RCSTA2.4


byte ch;
while (RCSTA2 & 0x06)

   ch=RCREG2;
   if (OERR)
   {
      CREN=0;
      CREN=1;
   }
}


Many thanks in advance for your thoughts and comments.

Regards,

Jason.
TSchultz



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PostPosted: Wed Apr 06, 2005 6:30 am    Reply with quote

One thing you need to make sure of is that there is a turn-around delay before any node transmits. This is especially critical if the connection is a 2 wire, half duplex interface. There has to be a delay to ensure that the last device that transmitted has switched to an idle or receive mode before anything is transmitted. Also make sure your grounding is correct between all the various nodes. This is a common source of problems.

Make sure you use the ERRORS switch in the use rs232 define. If not you have to ensure you properly handle the error flag.
jamesjl



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PostPosted: Wed Apr 06, 2005 8:07 am    Reply with quote

TSchultz,

the RS232 is defined as
Code:
#use rs232(baud=9600,parity=N,xmit=PIN_G1,rcv=PIN_G2,bits=8,ENABLE=PIN_G0,stream=RS485, ERRORS)

and should handle the errors, however I have added over-run and framing handling also.

Do you have a suggestion as to how long the turn around time should be?

Thanks,

Jason.
treitmey



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PostPosted: Wed Apr 06, 2005 8:15 am    Reply with quote

I clear the CREN 2 places. On error adobe reader runtime error windows xp the interrupt routine. and where you first enable the serial interrupt.(that way you start with a clear CREN bit) This is my ISR.

Code:
//=======================RXisr============================//
//Takes RX data from a stream and puts it into a buffer via interrupts
#INT_RDA
void RXisr(void)
{
  idle_bus=FALSE;
  //fprintf(DEBUG,"B\n\r");//busy bus
  RX_BUF[rx_indx_i]=RCREG;
  rx_indx_i++;
  if (rx_indx_i==rx_indx_o) // check for buffer overflow
  {
    bit_set(ERRORS,2);//set error flag bit 2 for RXbuffer overflow
  }
  if (OERR)
  {
    bit_set(ERRORS,0);//set error flag bit 0 for USART overflow
    CREN = 0;
    #asm nop #endasm
    CREN = 1;
  }
  set_timer1(TIMER1_INIT);
 }


For you error problem think about making some rand pause. Read a voltage, or temp or something and loop a rand routeen to get all pics on the bus with different rand numbers. Then when you want to transmitt, make sure the buss is idle, (idle n mS) then wait your rand time, then check idle again and then tranmitt. In a nutshell, thats what I do.

For your questions.
1) in the ISR
2) it is in the ISR, interupts are already disabled
3) Not sure, but a think CREN is just your 2 byte buffer overflowing, and NOT framing. Framing is a different bit(I think).
Humberto



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PostPosted: Rs 485 framing error Apr 06, 2005 8:58 am    Reply with quote

treitmey wrote:
Quote:

Framing is a different bit(I think), rs 485 framing error.

Framing error means that someting that looked like a character arrived
but that it was not formatted properly. No stop bit, incorrect number of
data bits, etc etc. In general the problem is a noisy line, rs 485 framing error. If you are using
RS485 it would be discarded.

The parameter ERRORS only does the trick for you if the problem is
regarding to framing or PIC UART buffer overflow.

Collision errors is tipical in multipoint communications lines and has a
close relationship with the line discipline manager that you are using to
prevent and ovoid that two or more transmitter transmit at the same time.

So I would re-check the time share of the whole network involved.

Keep well,

Humberto [/quote]
TSchultz



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PostPosted: Wed Apr 06, 2005 10:02 am    Reply with quote

For a turn-around delay, in a strict environment where I have designed all nodes, I normally use a delay of 3-5 byte periods (most of my links operate at 57.6Kbps or 115.2Kbps). If I have a PC involved, especially with Windoes, this normally extends to a minumum rs 485 framing error 5mS. If you are using third-part devices the minimum delay is normally listed in the device and/or protocol specs somewhere.

You basically need to wait long enough for the slowest transmitting node to finish the transmit loop and set it's RS-485 to receive mode.

This works flawlessly in a host/slave relationship with a poll/response type protocol. More care has to be taken if you are in an environment with multiple masters operating in an async manner.

The protocol I use has timeout checking where this a maximum delay between bytes as well as for the overall packet. This is in addition to an node ID, CRC and packet framing (start and end) check.

 
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wpantund framing errors

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Stuart Longland

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Dec 2, 2019, 9:24:19 AM12/2/19

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Hi all,

I'm trying to fine-tune a NCP built around a CC2538+CC2592 to act as a
border router.

I've managed to crank the baud rate of the serial link up to 230400bps.
Nowhere near the dizzying heights of the nRF52840 which seem to happily
scream along at 460800, but rs 485 framing error reasonable. We're limited in our
hardware because we need hardware that can punch an RF signal through a
couple of concrete floors.

The Fanstel USB840X looked promising, rs 485 framing error, but unless I'm doing rs 485 framing error, it would appear they're about 12dB weaker than our current
hardware. It could be a screw-up on my part, or it could be the
difference between the 2.4GHz antennas we normally use and the PCB
antenna that Fanstel provide. Sadly there's no such thing as a USB840XE
with an external antenna.

So we're re-purposing our standard hardware. There are two limitations
that I have to contend with:

- Only comms interface to the host is via the rs 485 framing error Sql logic error missing database ftd ports, which I
have configured to work as full-duplex (so one is transmit, the other is
receive).
- A max limit of 250kbps: the RS-485 line transceivers don't have the
slew rate to go faster.
- No hardware flow-control signals.

I've tweaked my buffers so that my interrupt-driven UART driver has 1KiB
to play with in terms of buffering incoming frames. I'm hoping this
will make up for the lack of flow control in that it'll try to ensure
all data gets captured.

I have not made any changes to the buffer sizes that OpenThread
allocates internally (the default is 1300 for RX, 512 for TX).

I still see lots of framing errors.

> Dec 2 05:12:42 raspi-br-01 wpantund[1354]: wpantund[1354]: NCP => Framing error 6: [80 03 72 3C 00 60 05 DB DC 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 0E D6 BB 62]
> Dec 2 05:12:42 raspi-br-01 wpantund[1354]: NCP => Framing error 6: [80 03 72 3C 00 60 05 DB DC 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 0E D6 BB 62]
> Dec 2 05:12:42 raspi-br-01 wpantund[1354]: wpantund[1354]: NCP => Framing error 6: [80 03 72 4A 01 60 0D 3A 88 01 22 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 F3 CE 2B 07]
> Dec 2 05:12:42 raspi-br-01 wpantund[1354]: NCP => Framing error 6: [80 03 72 4A 01 60 0D 3A rs 485 framing error 01 22 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 F3 CE 2B 07]
> Dec 2 05:12:42 raspi-br-01 wpantund[1354]: wpantund[1354]: NCP => Framing error 6: [80 03 72 3C 00 60 05 DB DC 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 0E D6 BB 62]
> Dec 2 05:12:42 raspi-br-01 wpantund[1354]: Cooler master v8 cpu fan error => Framing error 6: [80 03 72 3C 00 60 05 DB DC 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 0E D6 BB 62]
> Dec 2 05:12:43 raspi-br-01 wpantund[1354]: wpantund[1354]: NCP => Framing error 6: [80 03 72 4B 01 60 05 29 20 01 23 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 01 25 DD 42]
> Dec 2 05:12:43 raspi-br-01 wpantund[1354]: NCP => Framing error 6: [80 03 72 4B 01 60 05 29 20 01 23 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 01 25 DD 42]
> Dec 2 05:12:43 raspi-br-01 wpantund[1354]: wpantund[1354]: NCP => Framing error 6: [80 03 72 3C 00 60 05 29 20 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 01 25 DD 42 6E 56]
> Dec 2 05:12:43 raspi-br-01 wpantund[1354]: NCP => Framing error 6: [80 03 72 3C 00 60 05 29 20 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 rs 485 framing error 00 FD FD 34 FE 56 78 91 00 10 01 25 DD 42 6E 56]
> Dec 2 05:12:44 raspi-br-01 wpantund[1354]: wpantund[1354]: NCP => Framing error 6: [80 03 72 71 00 60 02 15 7A 00 49 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 E3 F8 4A DE]
> Dec 2 05:12:44 raspi-br-01 wpantund[1354]: NCP => Framing error 6: [80 03 72 71 00 60 02 15 7A 00 49 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 E3 F8 4A DE]

Oddly enough it repeats each twice. Not sure why.

The question in my mind is in which direction was this bad frame sent?
If from the NCP to the host, it could indicate a buffering issue in
transmitting the frame from the NCP or receiving at wpantund. The other
possibility is that it's the NCP complaining that it received a bad
frame from wpantund (either because wpantund messed it up or because my
UART driver missed something).

What would be the best approach for debugging this?

Regards,
--
Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind.
.it's backed up on a tape somewhere.

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Stuart Longland

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Dec 2, 2019, 11:17:32 AM12/2/19

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On 2/12/19 3:24 pm, Stuart Longland wrote:
> I'm trying to fine-tune a NCP built around a CC2538+CC2592 to act as a
> border router.
>
> I've managed to crank the baud rate of the serial link up to 230400bps.
> Nowhere near the dizzying heights of the nRF52840 which seem to happily
> scream along at 460800, but still reasonable. We're limited in our
> hardware because we need hardware that can punch an RF signal through a
> couple of concrete floors.
>

> … on error vba I still see lots of framing errors.

In the interests of debugging, I tried getting a Firefly to do the same.

OpenThread changes:
> $ rs 485 framing error diff
> diff --git a/examples/platforms/cc2538/uart.c b/examples/platforms/cc2538/uart.c
> index 992af65d5.5946c2220 100644
> --- a/examples/platforms/cc2538/uart.c
> +++ b/examples/platforms/cc2538/uart.c
> @@ -49,7 +49,7 @@
> enum
> {
> kPlatformClock = 32000000,
> - kBaudRate = 115200,
> + kBaudRate = 230400,
> kReceiveBufferSize = 128, rs 485 framing error,
> };

wpantund logs (running wpantund directly rather than via systemd):
> wpantund[5727]: NCP => Framing error 6: [80 03 72 50 00 60 01 3E 7E 00 28 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 5F 96 D9 31]
> wpantund[5727]: NCP => Framing error 6: [80 03 72 4B 01 60 00 FC 1D 01 23 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 7E BB 06 83]
> wpantund[5727]: NCP => Framing error 6: [80 03 72 4B 01 60 09 72 62 01 23 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 A4 CB 64 54]
> wpantund[5727]: NCP => Framing error 6: [80 03 72 3C 00 60 05 29 20 00 14 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 01 25 DD 42]
> wpantund[5727]: NCP => Framing error 6: [80 03 72 4B 01 60 00 E9 24 01 23 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 B8 62 F8 56]

So it might not be the RS-485 side of things.
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Lukasz Duda

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Dec 3, 2019, 2:49:27 AM12/3/19

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Stuart Longland

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Dec 3, 2019, 3:02:11 AM12/3/19

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On 3/12/19 8:49 am, Lukasz Duda wrote:
> Maybe unrelated, but regarding Nordic's nRF52840, I have recently delphi rlink32 pascal error e2161 a
> patch for UART high baud rates issue:
> https://github.com/openthread/openthread/pull/4350

Interesting, rs 485 framing error, I've only ever tried nRF52840 using USB-CDC and never
experienced a framing error on a Nordic-based NCP.

The only Nordic board I have where I can try UART-based NCP is the
PCA10056 board I bought. Last time I tried it on OpenThread it jammed
the network even though it has worked well in the past -- maybe ESD
killed it.

The downside with the Nordic dongles (PCA10059) is the lack of external
antenna connections and the low transmit power. We're hoping to have a
NCP that can punch through a couple of concrete floors if needed, so
+22dBm isn't just a nice-to-have.
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Stuart Longland

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Dec 3, 2019, 3:27:16 AM12/3/19

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On 2/12/19 5:17 pm, Stuart Longland wrote:
> wpantund logs (running wpantund directly rather than via systemd):
>> wpantund[5727]: NCP => Framing error 6: [80 03 72 50 00 60 01 3E 7E 00 28 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 5F 96 D9 31]
>> wpantund[5727]: NCP => Framing error 6: [80 03 72 4B 01 60 00 FC 1D 01 23 11 3F FD 9E E3 08 E1 4C B8 77 00 00 00 00 00 00 00 FD FD 34 FE 56 78 91 00 10 7E BB 06 83]

Some sleuthing… these messages are actually tunnelled over the spinel
link from the Rs 485 framing error. Specifically here:

https://github.com/openthread/openthread/blob/master/src/ncp/ncp_uart.cpp#L278-L309

This is called by this block of code:
https://github.com/openthread/openthread/blob/master/src/ncp/ncp_uart.cpp#L248-L276

which in turn, is called by this function pointer reference:
https://github.com/openthread/openthread/blob/master/src/ncp/ncp_uart.cpp#L87

which leads us here:
https://github.com/openthread/openthread/blob/master/src/ncp/hdlc.cpp#L239-L261

Soon as I see HDLC mentioned, I can't help but think of AX.25 and KISS
framing. I guess SLIP, KISS and other protocols all have a common
ancestor in HDLC. Funny to think my mucking around with packet radio on
VHF has relevance here. :-)

That said, I'm trying to understand the logic in that case block:
> if (mDecodedLength > 0)
> {
> otError error = OT_ERROR_PARSE;
>
> if ((mDecodedLength >= kFcsSize)
> #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
> && (mFcs == kGoodFcs)
> #endif
> )
> {
> // Remove the FCS from the frame.
> mWritePointer.UndoLastWrites(kFcsSize);
> error = OT_ERROR_NONE;
> }
>
> mFrameHandler(mContext, error);
> }

The outer `if` is easy enough… HDLC framing says you can have any
non-zero number of "flag" bytes between frames. The inner one is a
head-scratcher.

"If decoded length is greater than the size of the FCS", that's fine, rs 485 framing error,
but then "and FCS is equal to kGoodFcs (0xf0b8)"… that has me confused.
Surely one would be comparing the computed FCS (in mFcs) with the
*given* FCS at the last two bytes of the frame?

Or is that special value of 0xf0b8 chosen so that when the FCS given in
the frame is considered by `updateFcs`, that the resultant FCS should be
equal to 0xf0b8?

Is there a way Error mysql connect can send a test SPINEL frame to a NCP and have it echo
that frame back to me as it was received?

Regards,

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Hi,

I'm using the DALI RS485 gateway for LogicMachine (LM5Lp2), but I am having trouble scanning for devices in the DALI tab on the web interface of LogicMachine.

When I try to scan for devices, I get a popup stating that LM is "Scanning.". I've hooked up a USB interface and opened a DALI traffic monitor, and I just get loads of "framing error" messages on the traffic. This stops as soon LM stops scanning.

By using the USB interface and the software "DALI Cockpit" I am perfectly able to scan for devices and control the lights. However, as soon as I try to scan with LM, I get this framing error, rs 485 framing error. I've tried to communicate through scripts, rs 485 framing error, but I only get "timeout" when doing that.

The weird thing is that as late as yesterday, I had test-bench at home with one of the lamps and the same components as I did at the actual site, rs 485 framing error. Wired up the same way, same components, no trouble. I found the 1 device I had connected and was able to control the lamp through scripts.

I googled "DALI framing error" and got a PDF from ABBstating that a "framing error" appears on their devices whenever a duplicate address is found. So I tried to disconnect every single lamp from the DALI circuit, but still I got the "framing error". I tried only connecting one lamp. Rs 485 framing error thing.

What can I try to get this working again?

Image of LogicMachine rs 485 framing error and the DALI traffic monitor:

   

Posts: 5400
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First, run "Scan gateways" and see if the RS485 gateway is still there. If it appears in the list then try testing again with a single ballast and see if works. If it does not appear it's possible the ole error code 0x80030003 is damaged and must be replaced.
Another thing to try is to send a broadcast arc command from a script to check whether you can control ballasts this way or not.

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#3

21.09.2021, 10:31 (This post was last modified: 21.09.2021, 10:52 by avolle.)
(21.09.2021, 06:15)admin Wrote: First, run "Scan gateways" and see if the RS485 gateway is still there. If it appears in the list then try testing again with a single ballast and see if works. If it does not appear it's possible the it is damaged and must be replaced.
Another thing to try is to send a broadcast arc command from a script to check whether you can control ballasts this way or not.

Thanks for your reply. I always find the gateway I expect, so it's in the list.

I ran this script:

Code:



What came back was: 

Code:



I've now tried the following:
  • Deleting the `user.dali` script and rebooting. The script re-appears as expected, but still does not work.
  • Use another RS485 port on the LM5. The gateway appears after changing the port in the DALI tab, but still can't find any lamps or control them by scripts.


I have another LM5 with me, so I'll now be trying to replace the other one.

Edit: After swapping the LM5s, I'm still getting a framing error on the network and no devices appear in the device list. Could the DALI gateway be broken? I bought it in July and it's only been used at home for testing one lamp rs 485 framing error this project. I can write new gateway ID to rs 485 framing error gateway, the LED is on when i press the button on it. It appears to be fine from the outside.

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I don't see any other option apart from replacing the RS485 gateway.

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(22.09.2021, rs 485 framing error, 12:48)admin Wrote: I don't see any other option apart from replacing the RS485 gateway.

As I mentioned, it's only two months old. Will I get a replacement on warranty? I've arranged with my vendor to order a new one pending the result of this thread, as it's important to get the site up and running. Can they ship the defective gateway back to you?

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I see no problem in getting a replacement. It will be easier to sort this out via e-mail.

Framing error

Framing error can refer to the following:

  • General form rs 485 framing error a framing error is the result of starting to read a sequence of data at the wrong point.
  • In serial communications, a framing error is the result of reading a data frame -- a string of symbols which are grouped in blocks -- at the wrong starting point. The symbols are bits and the blocks are bytes, ten bits in asynchronous transmission and eight in synchronous. A framing error in an asynchronous stream usually recovers quickly, but a framing error in a synchronous stream produces gibberish at the end of the packet. Framing errors can be detected with parity bits.
  • In genetics, a rs 485 framing error error (also called a frameshift or a frameshift mutation) is a mutation that inserts or deletes a single nucleotide from a DNA sequence. Due to the triplet nature of gene expression, the insertion/deletion can disrupt the grouping of the codons, resulting in a hpdesignjet 500 ps error code 79 04 different translation from the original.
  • In psychology, the framing effect (psychology) is an example of cognitive bias in which people react to a particular choice in different ways depending on how it is presented. Cognitive errors as a result of this bias are commonly called framing errors.

Topics referred to by the same term

I'm having a similar problem with one of my systems. I have 4 weather stations on a PakBus network and communicating with FreeWave FGR-115RC transceivers. This has been working for years, rs 485 framing error, and the same setup is still working on another site. It seems that this problem started when our collection computer died and was replaced. We reinstalled LoggerNet Admin, but now we keep getting the same errors as reported above. I've tried modifiying the baud rate w/o success, and checked to settings on the transceivers to see if anything had changed. Nothing that I can see, rs 485 framing error. I've been struggling with this for months.

A few days ago, I discovered that if I just reboot the computer, everything works just fine, and data is downloaded from the CR3000 dataloggers, and I can also connect to them to view tables via LoggerNet Admin.  This is only good for a few minutes however (maybe 5 minutes) and I'm back to getting the PakBus framing error messages.

I have none of these issues on the collection computer at the other site. The settings are the same as far as I can tell. I mention to our IT people that there must be something different in the Windows 10 OS between the two systems, but they reject that theory.

Any suggestions on how I can troubleshoot this? Right now, my solution is to just reboot until my data download is caught up.

Thanks for any help.

T: +61 7 3535 9619
\/ _) rs 485 framing error

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