RS232 Transmit C125 / C127

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RS232 Transmit C125 / C127

Postby quadcam on Tue Dec 29, 2020 11:33 pm

Hello, I am hoping to configure the RS232-1 TX to transmit some ancillary data back to an ECU that is sending data via the RS232-1 RX to the dash. However I can't detect any data being transmitted from the dash.

In Communications, RS232-1 is configured for the ECU (+ Telemetry) data being send to the dash data and the ECU data to the dash works correctly. I have terminal capture software and it can see the ECU data being sent but not data from the dash. In Functions - Telemetry I selected Motec Telemetry (the original version) and some channels to be output and from my understanding this should have been sufficient to at least get something on the output with the same Baud, etc settings as the ECU uses. I also tried configuring CAN-2 for RS232 RX and set RS232-1 for Telemetry only but still couldn't see any data.

Based on these threads; viewtopic.php?f=14&t=1517 and viewtopic.php?f=14&p=21145 I am hoping that the C12x dashes operate in a similar fashion. Any advice / suggestions would be welcome. Thanks in advance.
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Re: RS232 Transmit C125 / C127

Postby David Ferguson on Wed Dec 30, 2020 2:39 am

Your dash won't send any telemetry data unless you have the T2 Telemetry option enabled.

Here was a similar question about a CDL3. Perhaps some of this will apply to you.

viewtopic.php?f=14&t=4655
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Re: RS232 Transmit C125 / C127

Postby greenamex2 on Wed Dec 30, 2020 7:30 am

David Ferguson wrote:Your dash won't send any telemetry data unless you have the T2 Telemetry option enabled.

Here was a similar question about a CDL3. Perhaps some of this will apply to you.

viewtopic.php?f=14&t=4655


The CDL3 method works...but...

The data being transmitted is in "ASCII" not binary format.

Fine for me as I am I writing my own software but I suspect not of much use to an ECU.

The telemetry option would get round this, but at a cost.
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Re: RS232 Transmit C125 / C127

Postby quadcam on Wed Dec 30, 2020 8:41 pm

David Ferguson wrote:Your dash won't send any telemetry data unless you have the T2 Telemetry option enabled.

Here was a similar question about a CDL3. Perhaps some of this will apply to you.

viewtopic.php?f=14&t=4655

Thanks for that. I hadn't noticed the Async TX 1 option in the list. I will give it a go and report back.
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Re: RS232 Transmit C125 / C127

Postby greenamex2 on Wed Dec 30, 2020 8:44 pm

quadcam wrote:
David Ferguson wrote:Your dash won't send any telemetry data unless you have the T2 Telemetry option enabled.

Here was a similar question about a CDL3. Perhaps some of this will apply to you.

viewtopic.php?f=14&t=4655

Thanks for that. I hadn't noticed the Async TX 1 option in the list. I will give it a go and report back.


Let me know if you need any help, but it's pretty simple.
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Nissan VQ30DE fitted to an AM Sportscars EX2 with a Hewland HP 2000
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Re: RS232 Transmit C125 / C127

Postby quadcam on Sat Jan 02, 2021 5:23 pm

The C1xx AsyncTX option worked fine to the capture software, although as greenamex2 noted the output was in ASCII, albeit with choices of hex or decimal format ahead of the ASCII conversion. As a telemetry server isn't required for this application and the telemetry upgrade isn't really viable for a couple of extra data channels a serial ASCII -> serial hex converter looks like the go.

Thanks both for the advice.
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