![usb to aldl usb to aldl](https://www.techedge.com.au/vehicle/im/aldlshem.gif)
It is USB based utilising an FTDI USB to serial converter, contains a switched +5V to +12V DC to DC converter and is terminated in a female 10 pin socket to provide full compatibility. To aid development and to perform a functional check on the above interfaces without having to connect to a car, an ECU emulator was built. Another port is configured as an input to monitor the state of the Service Mode line to be able to confirm that the car is in service mode. One of these is configured as an output and may be used to command the Service Mode line to become active to aid setting up the engine Base Timing. The RN41/42 chipset has many additional input/output ports.
![usb to aldl usb to aldl](https://lh4.googleusercontent.com/-fkHV17kJdnQ/TAMaaEXYbWI/AAAAAAAAAOI/UVfXL1amxno/aldl_sch.png)
The interface can be discretely plugged into the car's ALDL port and left in-situ if required. The Bluetooth interface has been manufactured with a custom designed single-sided printed circuit board (pcb) and this, together with the ALDL plug, is housed in a plastic case. controlling device goes outside of the operating range. To maintain the Bluetooth link when the engine is switched off, the interface remains active once a Bluetooth connection has been established and does not drop out until the Bluetooth connection is stopped or drops out e.g. To avoid the risk of battery drain when the car is not in use, the ALDL line is monitored by the sub-regulated power supply circuit and the Bluetooth interface is only powered up when the car's ECU is active, otherwise the current drain is negligible (microamps).
![usb to aldl usb to aldl](https://i.ebayimg.com/images/g/0zgAAOSw7GRZNoPD/s-l400.jpg)
To this end, the power supply is derived from the nominal +12V battery voltage available on the ALDL interface and is suitably sub-regulated with a robust reservoir to guarantee the Bluetooth connection is maintained. A Bluetooth connection takes a significant time to become re-established and may need to be initiated manually. When the battery voltage dips during engine starter motor activity, there is a risk that the Bluetooth interface power supply can drop out thereby and losing the Bluetooth connection. Unlike direct (serial or USB) interfaces, which source their power from the host computer, a Bluetooth connection is dependent on the car's battery. The RN41/42 are pin for pin plug-in compatible devices however the RN41 has a 100m range as opposed to 20m with the RN42. Communication with the ALDL interface is via the transmit and receive ports. The RN41/42 must be pre-programmed with custom setting for e.g. The Bluetooth interface is designed around the commonly available Microchip Roving Networks RN41/42 chipset.
#Usb to aldl android#
The interface can be used for connecting to the Windows based ElanScan and Android based ElandroidScan software. This interface has been designed to provide a robust Bluetooth (wireless) connection. Serial (RS232) Interface USB Interface Bluetooth Interface