![]() ![]() 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). 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. 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. OBD Diagnostics, Inc.Serial (RS232) Interface USB Interface Bluetooth Interface If you have the GM 16 pin OBDII style connector used on some 94-95 OBDI cars, buy the 16 pin cable. ![]() ![]() If you have some other connector configuration other than the GM 12 pin (such as Lotus cars) or a mid-1980's GM car with the serial data on pin D, buy the bare pin cable. Pin M indicates 8192 baud and pin E indicates 160 baud rate serial communication speed. This cable works on cars that have the serial data pin on pin M or pin E of the GM 12 pin OBD1 ALDL connector, which is most every 1982 to 1995 GM car. See our GM OBD1 home page for references and diagrams of the connectors styles. This cable is the most convenient to use if your car is equipped with the 12 pin connector style, as it allows you to just feel under the dash to plug it in. This cable has a 12 pin OBD1 connector shell to plug in under your cars dash to interface to your cars ECM. OBD2 All-In-One Scan Tool w/ USBĪLDL (GM OBD1) Cable with 12 pin ConnectorĪLDL (GM OBD1) Cable with 12 pin Connector, USB ![]()
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