some basic questions regarding the library and the interface

[santon74]

Hello, I am trying to implement this library and the interface for communicating with early 2000 GM truck. I have some rather basic questions regarding the interface circuit and the library. I hope it is OK to ask them here.

1. The author stated that the library was designed for Chrysler vehicle. Will this library work with J1850 VPW of GM?
2. I noticed that the 3 transistor interface circuit will tie the J1850 bus line to the HIGH state. Is it correct? If so, could it cause any issue?
3. is there a simple way to simulate the J1850 VPW signals without using the car's components on the bench? The second Arduino, for example? Sorry for these questions- I am a complete beginner in this field. Thanks!

[matafonoff]

Hello!

1. It must be working with any j1850vpw, but was tested hardly on Chrysler/dodge vehicles.
2. Yes, so the circuit must be powered before vehicle startup to prevent bus communication issues
3. You could use 2 arduonos . I’ve tested this scenario before working with vehicle’s data bus

Best regards, Stepan Matafonov!

28 мая 2022 г., в 02:25, santon74 @.***> написал(а):

 Hello, I am trying to implement this library and the interface for communicating with early 2000 GM truck. I have some rather basic questions regarding the interface circuit and the library. I hope it is OK to ask them here.

The author stated that the library was designed for Chrysler vehicle. Will this library work with J1850 VPN of GM? I noticed that the 3 transistor interface circuit will tie the J1850 bus line to the HIGH state. Is it correct? If so, could it cause any issue? is there a simple way to simulate the J1850 VPN signals without using the car's components on the bench? The second Arduino, for example? Sorry for these questions- I am a complete beginner in this field. Thanks! — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.

[santon74]

Dear Stepan, Thank you for your prompt response. I tried to use 2 Arduinos, connected directly, without the interface circuit (Rx to Tx, Tx to Rx). On one of them, I used a "transceiver.ino" or "j1850-to-serial.ino" sketch while another one was running "sniffer.ino" sketch. With this arrangement, I was getting the ERR_PULSE_OUTSIDE_FRAME error. Is there anything that I am doing wrong? Thanks. Anton.

[matafonoff]

It does not work without circuit. Don’t know why, but I had this issue

Best regards, Stepan Matafonov!

28 мая 2022 г., в 14:08, santon74 @.***> написал(а):

 Dear Stepan, Thank you for your prompt response. I tried to use 2 Arduinos, connected directly, without the interface circuit (Rx to Tx, Tx to Rx). On one of them, I used a "transceiver.ino" or "j1850-to-serial.ino" sketch while another one was running "sniffer.ino" sketch. With this arrangement, I was getting the ERR_PULSE_OUTSIDE_FRAME error. Is there anything that I am doing wrong? Thanks. Anton.

— Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.