Hi i just bought a usb to db9 cable . i need to reprogram an ecu i fitted to my car but my laptop doesnt have a serial port (only usb)and it is not connecting to the ecu . i use to do this with my friends laptop which had a serial port .What can i do? Thanks
Not all USB ports are the same on all computers. There is USB and then there is USB 2.0. Many computers/laptops have both. The difference is in the speeds supported and whether or not there is voltage on the pins. Some laptops do not have enough voltage to run the device that is plugged into the USB ports.
Try this: If there is more than one USB port then try another one. If this STILL does not work then get an adapter or multiport hub that has an external power supply with it. See D-Link's Hi-speed USB 2.0 4Port Hub.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Ah, yes, I too used Waveteks back in the old days and I still have old PCs with serial cards in them which typically came with the PC. They were never really all that expensive to replace.
Anyway, newer PCs typically lack serial (DB9) ports/cards; and simply using a USB-to-DB9 adapter on a device designed to use a DB9 interface won't help the PC "find" the unit attached to it. Theres no easy "plug-and-play" there. The PC wants to have drivers for the unit installed manually, then with some luck something will show up in Device Manager. Conversely the old Wavetek wants to see X number of pins, etc. or it will assume somethings wrong.
There are a few "USB to RS-232 DB9 Serial Drivers" (e.g. "Prolific" brand) to be downloaded here and there, I can't tell how effective they are, depending on your PC hardware/software.
You can try a Hard Reboot, remove the battery cables from the battery, wait 20 minutes then make contact with the + an - cables together for at least 10 seconds. Normally you would want to run a diagnostic on the new computer if it cam out of another car just to erase the codes from the other car.
Hi , One side of the lead is designed to fit on the computer , the other one on your HP unit . If nothing fits on any side , you need to go back to your retailer where a correct cable will be given to you , in exchange for the previous one . Best regards .
Its very easy , what type of mouse, and what interface does the mouse have, if its USB connect to a usb port on the system, if its the DB9 pin type connect it to the db9 port, and once connected the system will identify the hardware automatically, if it requires drivers, it will request for it and follow the instructions
If you have a BackUPS CS, you are probably either using it with the USB cable that is supplied or with the 940-0128A supplied by APC, which permits running the UPS in dumb mode. By building your own cable, you can now run the BackUPS CS models (and perhaps also the ES models) using smart signalling and have all the same information that is available as running it in USB mode.
The jack in the UPS may be easily use a 8 pin RJ45 connector. It is easy to construct the cable by cutting off one end of a standard RJ45-8 ethernet cable and wiring the other end (three wires) into a standard DB9F female serial port connector.
Though these UPSes are USB UPSes, APC supplies a serial cable (typically with a green DB9 F connector) that has 940-0128A stamped into one side of the plastic serial port connector.
Here is suggested scheme of original 940-0128A cable APC Part# - 940-0128A
computer --------- Inside the Connector--------- UPS
DB9-F | | RJ45
pin - signal | | Pin - Color
4 DSR ->|---+ |
| | diode resistor |
6 DTR ->|---+---->|----///---o kill power | 8 Orange
1 DCD <-|----+ |
| | |
2 RxD <-|----+----------------+--o low battery| 3 Brown
| | |
7 RTS ->|----------+--///--+ |
| | |
| +--///--+ |
| | |
8 RI <-|----+----------------+--o on battery | 2 Black
| | |
9 CTS <-|----+ |
| signal |
5 GND --|-----------------------o ground | 7 Red
3 TxD | |
| chassis |
Chassis/GND |-----------------------o ground | 4 Black
| Not connected | 1, 5, 6, 9, 10