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dracoventions / TWCManager

Control power delivered by a Tesla Wall Charger using two wires screwed into its RS-485 terminals.
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Termination and bias resistors #9

Open llamad911 opened 5 years ago

llamad911 commented 5 years ago

Hello, good job for the code! In your code, you specify: To prevent most noise between messages, add a 120ohm "termination" resistor in parallel to the D+ and D- lines. Also add a 680ohm "bias" resistor between the D+ line and +5V and a second 680ohm "bias" resistor between the D- line and # ground. But the way I see the installation between the Rapbberry Pi and the TWC, we only need two wires from the RS485; the D+ and the D-.

What do I do with the RS485 5V and Ground wires ? Do I just simply cut them or they have to be connected somewhere in the TWC? If I only keep the D+ and the D-, do I need the 120ohm "termination" resistor in parallel to the D+ and D- lines? Thanks for your precisions. Best regards,

rhernaus commented 5 years ago

Put a 120 Ohm resistor between D+ and D-. Put a 680 Ohm (pull-up) resistor between 5v and D+. Put a 680 Ohm (pull-down) resistor between Ground and D-. Connect D+ and D- to your TWC.

laur3ns commented 5 years ago

Does it matter if you connect the resistors on the Pi end or the TWC end?

And should you first try without or always do this? I have a USB-RS485-WE-1800-BT.

rhernaus commented 5 years ago

Daisy chain if you have more than two devices (eg. 2+ TWCs) and terminate at both ends of the wire. Some RS485 adapters already have a termination resistor built in. And some even have the pull-up/down resistors built in. Check this first before adding resistors.

I didn't add resistors at first and my RS485 adapters died after 1-3 weeks of operation.

simotronic commented 5 years ago

At the moment I'm using a different RS 232/RS485 and a USB to the RS 242(!). I didn't put the termination on it, just two wire. But you're right. I should check to make sure it isn't wild! Some adapters, like the Grid connect ones (gridconnect.com) have jumpers/configuration to do that. I was thinking of running the serial over a remote TCP connection because I can run the software elsewhere for testing purposes. Right now I do have the raspberry pi running the USB to serial and the python script together with the lightweight https server. But it isn't publicly accessible! Was also going to throw the OpenEVSE into the mix!!! Simon

On Mon, Sep 2, 2019, 8:47 PM rhernaus notifications@github.com wrote:

Daisy chain if you have more than two devices (eg. 2+ TWCs) and terminate and both ends of the wire. Some RS485 adapters already have a termination resistor build in. And some even have the pull-up/down resistors build in. Check this first before adding resistors.

I didn't add resistors at first and my RS485 adapters died after 1-3 weeks of operation.

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laur3ns commented 5 years ago

I didn't terminate mine, one Pi, two TWCs. I did however need to ground the Pi side of the USB-RS485 cable before communication was smooth on the 2nd TWC. Logical, since Pi normally has no ground connection through the power supply.

I might add resistors later. The USB-RS485 has two wires that have the 120Ohm built in that I could connect to the D+/D- for this. On the TWC I could add it ont he D+/D- out port of the last TWC (currently that connection is open).

Cable length is probably 25m (CAT6 no shield) Pi-TWC1 and another 7 (SFTP CAT6) from TWC1-TWC2.

laur3ns commented 5 years ago

I didn't add resistors at first and my RS485 adapters died after 1-3 weeks of operation.

How could you kill it by not adding the 120Ohm? I mean, it would read more noise/not see a clear signal, but it's not like it would overcurrent and blow things up, or will it?

robot256 commented 5 years ago

It's possible to damage parts with unterminated lines because reflections cause voltage spikes (overshoot). This is more likely on long wires, and also depends on how sensitive the devices are. I can't say without putting a scope at the TWC terminals whether that's happening, or how long it will be before said spikes actually cause a failure--it could be weeks, years, or it could be never if the device has robust protection diodes. I'll check mine for overshoot when I get it installed, I was testing without terminations this weekend.

twoway commented 4 years ago

Hi I have an brand new WC (European version) with communication problems. When TWCManager starts up connection is activated and ok for a minute or so. Then i get this:

Traceback (most recent call last):
  File "TWC/TWCManager.py", line 2857, in <module>
    if(msgLen == 0 and data[0] != 0xc0):
IndexError: index out of range

And after a while more this;: 07:38:09: WARNING: We haven't heard from slave 1839 for over 26 seconds. Stop sending them heartbeat messages.

Then 4 red blinks on WC... Then after a while (30s to a minute) comms is OK again and so it continues. Installation:

Tested with and without 120Ohm termination i both ends (D- and D+ IN-terminals in WC). Same problem.

When charging the charging is interrupted and starts again when comms is OK and so it continues.

Any tips...

twoway commented 4 years ago

This is debug level 11 startup until connection is lost..

TWC Manager starting as fake Master with id 7777 and sign 77 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 Rx@07:53:28: () FD E2 18 39 52 0C 80 00 00 00 00 00 00 00 00 11 FF 07:53:28: ERROR: Ignoring message of unexpected length 17: FD E2 18 39 52 0C 80 00 00 00 00 00 00 00 00 11 FF 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 Rx@07:53:37: () FD E2 18 39 52 0C 80 00 00 00 00 00 00 00 00 11 07:53:37: 32.00 amp slave TWC 1839 is ready to link. Sign: 52 07:53:37: Set slave TWC 1839 protocolVersion to 2, minAmpsTWCSupports to 6. Tx@07:53:37: C0 FB E0 77 77 18 39 00 00 00 00 00 00 00 00 00 1F C0 Tx@07:53:38: C0 FB E0 77 77 18 39 00 00 00 00 00 00 00 00 00 1F C0 Tx@07:53:39: C0 FB E0 77 77 18 39 00 00 00 00 00 00 00 00 00 1F C0 Rx@07:53:39: () FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 11 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:39: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Rx@07:53:39: (FC) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 11 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:39: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Tx@07:53:40: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:41: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:42: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:43: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 00 between messages. Ignoring byte 00 between messages. Ignoring byte 1F between messages. Tx@07:53:44: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:45: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:46: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:47: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:48: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Rx@07:53:49: (FC 00 00 1F) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 20 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:49: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Tx@07:53:49: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:50: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:51: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:52: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:53: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:54: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:55: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:56: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Rx@07:53:57: (FC) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 28 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:57: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Rx@07:53:57: (FC) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 28 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:57: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Tx@07:53:57: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:58: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 77 between messages. Ignoring byte 77 between messages. Tx@07:53:59: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 1F between messages. 07:54:02: Msg timeout (FC 77 77 1F) C0 FC Tx@07:54:02: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:03: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:04: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:05: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:06: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 77 between messages. Ignoring byte 00 between messages. Ignoring byte 00 between messages. Ignoring byte 00 between messages. Traceback (most recent call last): File "TWC/TWCManager.py", line 2857, in if(msgLen == 0 and data[0] != 0xc0): IndexError: index out of range Tx@07:54:11: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:12: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:13: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:14: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:15: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:16: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:17: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 07:54:20: Msg timeout (77 00 00 00) C0 Tx@07:54:20: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:21: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:22: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 07:54:24: Msg timeout () C0 FD E0 07:54:24: WARNING: We haven't heard from slave 1839 for over 26 seconds. Stop sending them heartbeat messages.

laur3ns commented 4 years ago

Connect the GRN terminal to ground/earth on the Pi side. Was an issue for me on my 2 TWC network. The Pi has no real ground or earth by itself from a USB power adapter.

Kind regards, Keenondots Laurens van Alphen FOUNDER & CTO +31 88 82 82 100 +31 650674546

From: twoway notifications@github.com Sent: Saturday, November 2, 2019 7:59:18 AM To: cdragon/TWCManager TWCManager@noreply.github.com Cc: Laurens van Alphen (Keenondots) laurens.van.alphen@keenondots.com; Comment comment@noreply.github.com Subject: Re: [cdragon/TWCManager] Termination and bias resistors (#9)

This is debug level 11 startup until connection is lost..

TWC Manager starting as fake Master with id 7777 and sign 77 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 Rx@07:53:28: () FD E2 18 39 52 0C 80 00 00 00 00 00 00 00 00 11 FF 07:53:28: ERROR: Ignoring message of unexpected length 17: FD E2 18 39 52 0C 80 00 00 00 00 00 00 00 00 11 FF 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:28: Send master linkready1 Tx@07:53:28: C0 FC E1 77 77 77 00 00 00 00 00 00 00 00 46 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 07:53:29: Send master linkready2 Tx@07:53:29: C0 FB E2 77 77 77 00 00 00 00 00 00 00 00 47 C0 Rx@07:53:37: () FD E2 18 39 52 0C 80 00 00 00 00 00 00 00 00 11 07:53:37: 32.00 amp slave TWC 1839 is ready to link. Sign: 52 07:53:37: Set slave TWC 1839 protocolVersion to 2, minAmpsTWCSupports to 6. Tx@07:53:37: C0 FB E0 77 77 18 39 00 00 00 00 00 00 00 00 00 1F C0 Tx@07:53:38: C0 FB E0 77 77 18 39 00 00 00 00 00 00 00 00 00 1F C0 Tx@07:53:39: C0 FB E0 77 77 18 39 00 00 00 00 00 00 00 00 00 1F C0 Rx@07:53:39: () FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 11 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:39: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Rx@07:53:39: (FC) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 11 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:39: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Tx@07:53:40: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:41: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:42: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:43: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 00 between messages. Ignoring byte 00 between messages. Ignoring byte 1F between messages. Tx@07:53:44: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:45: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:46: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:47: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:48: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Rx@07:53:49: (FC 00 00 1F) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 20 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:49: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Tx@07:53:49: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:50: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:51: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:52: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:53: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:54: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:55: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:56: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Rx@07:53:57: (FC) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 28 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:57: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Rx@07:53:57: (FC) FD E0 18 39 77 77 00 00 00 00 00 00 00 00 00 1F desiredAmpsOffered reduced from 6 to 6 with 1 cars charging. Don't start charging yet because: self.lastAmpsOffered 0.0 == 0 and time - self.timeLastAmpsOfferedChanged 28 < 60 set_last_amps_offered(TWCID=18 39, desiredAmpsOffered=0.0) 07:53:57: SHB 1839: 00 00.00/00.00A 0000 0000 M: 09 00.00/00.00A 0000 0000 Ignoring byte FC between messages. Tx@07:53:57: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:53:58: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 77 between messages. Ignoring byte 77 between messages. Tx@07:53:59: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 1F between messages. 07:54:02: Msg timeout (FC 77 77 1F) C0 FC Tx@07:54:02: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:03: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:04: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:05: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:06: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Ignoring byte 77 between messages. Ignoring byte 00 between messages. Ignoring byte 00 between messages. Ignoring byte 00 between messages. Traceback (most recent call last): File "TWC/TWCManager.py", line 2857, in if(msgLen == 0 and data[0] != 0xc0): IndexError: index out of range Tx@07:54:11: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:12: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:13: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:14: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:15: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:16: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:17: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 07:54:20: Msg timeout (77 00 00 00) C0 Tx@07:54:20: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:21: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 Tx@07:54:22: C0 FB E0 77 77 18 39 09 00 00 00 00 00 00 00 00 28 C0 07:54:24: Msg timeout () C0 FD E0 07:54:24: WARNING: We haven't heard from slave 1839 for over 26 seconds. Stop sending them heartbeat messages.

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twoway commented 4 years ago

Problem solved. After investigation, I had another parallel application communicating on the same USB->485 device. After shutting that app down everything seems to work out fine.